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MM003 : Steel Terms.
A - As a coating designator. Designates Zinc-Iron Alloy (Galvannealed) Coating, either thermally treated (galvannealed)
or electrolytlcally applied.
Aluminum Zinc Alloy Coated Steel Sheets (Galvalume) - A carbon steel product continuously hot dipped coated,
nominally by weight, with 55% aluminum. 1.6% silicon, and the balance Zinc. The product is intended for applications
requiring corrosion resistance, heat resistance, or both.
AASHTO - American Association of State Highway and Transportation
Annealing - A process of controlled heating, soaking at elevated temperatures, and controlled cooling for the purposes of
softening, developing a grain structure, improve machability, or obtaining a special set of physical or mechanical
properties.
ASTM - American Society for Testing and Materials. Organization which sets technical standards and specifications for
steel and other materials, systems, services, etc. Generally, ASTM standards constitute the "laws" governing
steel products.
Age Hardening - A process in which steel increases hardness and strength and ordinarily decreases ductility over time.
Special Killed (i.e., aluminum killed) prevents that condition.
Aging - Changes in physical and mechanical properties that occur when low carbon steel is stored for some time. Aging is
also accelerated by exposure of steel to elevated temperatures. Stretcher strains and fluting can result from aging.
Aging - (a.k.a. Age Hardening) A process in which steel increases hardness and strength and decreases ductility over
time. Special killed (i.e., aluminum killed) prevents that condition.
AISI - American Iron & Steel Institute. No longer writes chemical specifications. The SAE has taken over the task.
Alloy Coated - When a metallic coating, through heat treating, becomes a part of the base metal. i.e. galvannealed,
aluminum zinc, long ternes.
Aluminized - A cold-rolled sheet with aluminum applied (by hot-dip process) to the top and bottom sides. Provides
excellent heat resistance and very good corrosion resistance.
Aluminum Coated Steel Sheets - Type 1 a carbon steel product continuously hot dipped coated with an aluminum coating
containing 5 to 10 percent silicon Heat resistant grade used for heat exchangers and automotive mufflers.
Aluminum Coated Steel Sheets - Type 2 a carbon steel product continuously hot dipped coated with a pure aluminum.
Combines the strength of the steel substrate and the corrosion resistance and reflectivity of the pure aluminum.
Aluminum Killed - see Special Killed.
Aluminum – Deoxidizes the steel and ties up Nitrogen. This combined action improves ductility. Chemical symbol
Al.
Annealing - A process involving the controlled high-temperature heating and subsequent cooling of as-rolled (usually
Full-Hard) Cold Rolled or Hot Rolled to induce softness and greater formability.
B
Black Plate - Cold reduced sheet steel ranging in width from over 12 inches to less than 32 inches and in gauge from 29
(.0135) and lighter, in coil or cut lengths, and within the uniform Classification of Flat Rolled Carbon Steel Products.
Bake Hardenable Steel - A grade of Cold Rolled sheet with good dent resistance, especially common in automobile
doors and panels.
Band - A basic form of Hot Rolled coil. As rolled from the hot strip mill. Usually has a 28” to 30” ID.
Usually has an as rolled curved head (ID) and irregular fish tail (OD).
Black Plate - The uncoated steel sheet product before electrotinning. An A.I.S.I. Flat Rolled Carbon Steel Product
Classification for a cold rolled coil or cut length product ranging in width from over 12" to less than 32". and
29 gauge (0.013”) or lighter.
Buckle, Arbor Bends - Creases, wrinkles, or departures from flat, occurring perpendicular to the slit edge of a coil and
which are repetitive in nature, with severity decreasing as the distance increases in the coil from the original source. Often
they are found at/near the coil ID or OD.
Bend, Longitudinal - A bend in the direction of (with) the grain; easier bend
Bend, Transverse - A bend perpendicular to (against) the grain; harder bend
Bend Radius - Inside radius of a bent section, normally indicated as a factor of material thickness (T). 1-T bend diameter
= 1/2-T bend radius.
Bend Test - Tests used to determine steel ductility in which material is bent (with or against the grain).
Billet - A hot-worked semi finished product suitable for subsequent working by such methods as rolling, forging,
extruding, etc.
Black Plate - A specific form of light gauge (typically under .016”) Cold Rolled sheet, usually used as feedstock
for Tinplate.
Blank - A generally-small steel sheet, typically with restrictive width, length and diagonal tolerances.
Blister - In coated products, a defect caused by the formation of gas bubbles in a zinc or aluminum coating. In uncoated,
refers to a raised spot on the steel surface evidencing inclusions and small laminations.
Blisters - A defect produced by gas bubbles.
Bonderized - A proprietary name for a phosphate treated steel or metallic coated substrate. See Phosphatized.
Bonderized - Hot-dipped galvanized that has been phosphate-treated for improved paintability. Same corrosion
resistance and formability as regular galvanized. A medium-dark gray surface with some spangle appearance.
Boron - Improves ductility by combining with nitrogen. Increases hardenability, by slowing down the transformation rate.
Chemical symbol B.
Bow, Longitudinal - Curvature in the plane of sheet or plate in the rolling direction. Usually caused by unbalanced stresses
between the top and bottom surfaces of the rolled product - Coil set -.
Bow, Transverse - Curvature across the rolling direction of sheet. A more severe case can result in a center buckle.
Usually caused by unbalanced roll bending during the hot rolling - Canoe shape -.
Box Annealing - Annealing steel by heating in a sealed container under conditions that minimize oxidization.
Buckle, Center - Undulations (wavy regions) in the center of the metal.
Buckle, Edge - Undulations (wavy regions) along the edge(s) of the metal.
Buckle - A distortion (usually repetitive) in flatness during rolling.
Build Up Coil - A coil made by welding (or stitching) together two or more coils to make a larger one, often for efficiency
during the galvanizing process.
Burr - A thin ridge of roughness left by a cutting operation such as slitting, trimming, shearing, blanking or sawing.
Burred Edge - A thin turned down edge on sheet resulting from shearing or slitting. Only the Perforating Association has a
suggested 10% of metal thickness as a listed maximum tolerance.
C
Camber - The tolerance for a coil or cut length product, as in a sheet product, the deviation from edge straightness. The
amount is determined along the concave side using a straight edge an expressed as a measurement per unit length, e.g..
1" in 20'.
Camber - Camber is the deviation of a side edge from a straight line, the measurement being taken on the concave side
with a straight edge.
Carbon - Main hardening element in steel. Usually, as carbon increases: tensile increases; ductility and weldability
decreases. Chemical symbol C.
Capped Steel -OLD STEEL MAKING- Capped Steels have characteristics similar to those of rimmed steels but to a
degree intermediate between those of rimmed and semi-killed steels. Capped steels are not as segregated and are harder
than rimmed steels. Because of the increased hardness of sheet produced from mechanically capped steel, this type is not
generally used where severe forming is involved. However, this grade is satisfactory for most applications where only mild
forming or bending is required. Generally, steels of this type are above, 0.15% carbon and are applied to sheet, strip,
skelp and tin plate.
Carbon Steel - Steel which owes its properties chiefly to carbon without substantial amounts of other alloying elements;
also known as straight carbon steel or plain carbon steel. Steel is classified as carbon steel when the maximum content
does not exceed the following percentages: Manganese: 1.65; Silicon: 0.60; Copper: 0.60 (when specified).
Center Buckle - A wave condition in the coil/sheet, caused by the center (in the rolling direction) being longer than the
edges.
Chemical Treatment - Process for passivating a galvanized coating to retard the formation of "wet storage stains"; during
shipment and storage. Most chemical treatment is used to prevent storage stains. Process for preparing a surface for
painting. See Phosphatized.
Cold Rolled Sheet Steel - A flat rolled steel product classification produced to an ordered thickness by cold reducing a
heavier gauge hot rolled coil. The cold reduced coil (full hard) is subjected to additional processing. The coil could be run
through a continuous coating line; or softened in a controlled anneal and temper rolled.
Commercial Quality (CQ now CS) - Sheet of this quality is for uses involving simple bending or moderate drawing.
Commercial Quality sheet can be bent flat upon Itself in any direction at room temperature. (Sheets of this quality can be
specified to ASTM A526 now ASTM A1008) (full hard) is subjected to additional processing, continuous line,
controlled annealing, and temper rolling to produce un-coated cold rolled sheet steel products.
Con Cast Steel - There is a large scale production of continuous cast slabs, steels of this type have been found to be
equal to and often better than conventional cast steels of the same nominal grade. One of the biggest
metallurgical advantages is the uniformity of chemical composition and mechanical properties as compared to ingot cast
steels. This results from the fact that the continuous cast slab solidifies in a few minutes, whereas in an
ingot, complete solidification is not obtained until hours have gone by. Chemical segregation, characteristic of ingot cast
steel, is virtually absent in continuous cast slabs.
Chemical/Chromate Treatment - A chemical solution applied to galvanized to further forestall rust.
Chromium - Hardens steel and prevents rust. Is prominent in Stainless steel. Chemical symbol Cr.
Continuous Annealing -The heat treating process performed in a line designed to unwind a steel coil, pass it through a
controlled atmosphere furnace in a single thickness, cool it at a controlled rate, and rewind it for shipment to its next
destination.
Continuously Cast Steel - A process involving the pouring of liquid steel continuously as it solidifies into a desired shape,
square, rectangular, or other cross section. The shape is with drawn from the mold according to a calculated rate based
upon the cross section being cast. The metered rate of the liquid metal, the available cooling and other factors.
Corrosion, Water Stain - Superficial oxidation of the surface in the absence of circulating air. Often caused by moisture
trapped between closely adjacent metal surfaces such as between wraps of a coil or sheets of a stack. On Hot Rolled and
Cold Rolled products the color is typically yellow, orange and/or red. On Galvanized, it's often a whitish color but can
also range to black.
Crease - A sharp deviation from flat in the sheet which is transferred from processing equipment subsequent to the roll
bite. If longitudinal, typical sources include idler rolls, leveler rolls, segmented rolls and slitter spacers. If transverse,
typical sources include mandrels, coil ends and racks.
Coating, High or Low - Failure to meet the proper coating weight range.
Coating Build-Up - A coating thickness greater than nominal due to uneven application.
Coating Designation - 'G' Free Zinc, 'A' Zinc-Iron Alloy (Galvannealed), 'X' No Coating. i.e.. One Side Coated
(Metric), 'E' Exposed Part (Metric), or 'U' Unexposed Part grams/m^3 (Metric)
Coating Drip - A non-uniform extraneous deposit of coating on the coated sheet.
Coating Ridge - On coated steels, a hump in the rolling direction usually caused by improper wiping when exiting the
coating tank.
Coating Weight - The amount of zinc and/or aluminum applied to Galvanized, Electrogalvanized, or Aluminized sheet,
normally expressed in oz./ft2.
Coil Breaks - A deficit, exhibiting creases, a river type appearing, snaky pattern across a metal sheet running transverse
to the coiling or rolling direction. The spacing is irregular and its location in the surface is very often random. Creases of
ridges which appear as parallel lines, transverse to the direction of rolling. They generally extend across the width of the
sheet.
Coil Coated Sheet Steel - Also termed prepainted. Is a sheet steel product exhibiting a paint, plastic, or non-metallic film
on one or both of its surfaces. Coil Set - Longitudinal bow in an unwound coil, caused by the action of winding the sheet
into a coil.
Cold Rolled Products - Flat rolled products for which the approximate required thickness has been obtained by rolling
HR bands without heating at approximately room temperature.
Cold Rolling - Passing of Hot Rolled coils through work rolls to reduce and tighten thickness range, improve shape and
surface quality.
Coll Weld - A coil weld is a joint between two lengths of metal within a coil. Coil welds are not always visible in a cold
reduced product.
Collapsed Coil - Out-of-round condition of coil often due inappropriate tension during rewinding operations. The internal
diameter (ID) is compressed.
Columbium - Often used in high-strength low-alloy steels for increased yield and tensile strengths. Also referred to as
Niobium. Chemical symbol Cb.
Continuous Annealing - A process in which steel coils are unwound and passed through a furnace where they are
subjected to a prescribed annealing cycle under a protective atmosphere.
Copper - Increases atmospheric corrosion resistance. Chemical symbol Cu.
Corrosion (a.k.a. Rust) - Degradation of metal caused by atmospheric conditions, i.e., moisture, oxygen, chemicals.
There are varying degrees of severity, i.e., extent across surface, depth of penetration into surface.
Corrosion - Gradual chemical or electrochemical attack on a metal by atmospheric moisture or other agents. The
deterioration is caused by chemical attack via. an electrolytic based reaction within an environment.
Cracks, Edge - Tears or discontinuity on the coil/sheet edge.
Crossbow - A curvature across the width of the strip perpendicular to the rolling or coiling direction.
Crossbreaks - Refer to Coil Breaks.
Crown - The contour on a sheet where the thickness increases from the edges to the center.
Cut Edge - More defined than mill edge, usually associated with tighter width tolerances.
D
Deferentially Coated - Instead of exhibiting the same coating weight, or designation, per side of the sheet, this product will
have contrastingly different coating weights on each side, i.e. one side will have a light coating and the other side will have
a heavy coating.
Deep Drawing Special Killed Fully Stabilized (DDQSK-IF) - Explanation same as Extra Deep Drawing. Produced from
vacuum degassed steel to eliminate coll breaks. strain lines, and fluting during fabrication.
Drawing Quality (DQ-DS) - An A.S.T.M. designation for uncoated or metallic coated sheet steel intended for a
specifically identified part where the draw or deformation is moderately severe. The steel manufacturer selects the steel
grade, chemistry, and the processing to make the identified part.
Drawing Quality Special Killed (DQSK-DDS) - When Drawing Quality will not provide a sufficient degree of ductility for
fabrication of parts or applications require that the sheet be free from aging. Drawing Quality Special Killed steel should
be used. This quality is made by special steel making and processing practices. Also sometimes known as deep drawing
quality.
Dead Soft - Material that has not been rolled or tempered following annealing. Characterized by very low hardness, yield
strength, tensile strength with comparatively-high elongation.
Debur - To remove sharp edges from a slit or cut edge.
Deep Drawing - A press forming process utilizing the plastic flow characteristics of a metal to form deep cup or pan
shapes with deeply recessed turns or comers.
Density - The mass per unit volume of a substance. The density of carbon steel is .2833 pounds per cubic inch.
Dent - A sharply defined surface impression on the metal which may be caused by a blow from another object.
Dirt - Foreign debris embedded in or under the coating from rolling or post-rolling operations.
Drawing Quality Aluminum Killed (DQAK) - Specially killed steel using aluminum as the deoxidizing agent.
Drawing Quality (DQ) - As compared with sheet of Commercial Quality, Drawing Quality sheet has a greater degree of
ductility and is more consistent in performance.
Drawing Steel (DS) - For applications involving ductility beyond Commercial Steel (CS).
Dross - Drops of sediment atop galvanized sheet.
Ductility - The ability to permit change of shape without fracture. In steel, ductility is usually measured by elongation and
reduction of area as determined in a tensile, hardness, or Olsen test.
E
E - An A.S.T.M. designation for Exposed (parts)
Edges, Mill - Normal edge produced in hot rolling and it does not conform to any definite contour. Mill edge product may
contain some edge imperfections the more common types of which are, checked edges, thin edges (feather) and damaged
edges due to handling or processing. These edge conditions are detrimental where joining of the mill edges by welding is
practiced. When the customer intends to shear or blank, a sufficient width allowance should be made by the purchaser to
assure obtaining the desired shape and size of the pattern sheet. A cut edge is the normal edge which results from the
shearing, slitting or trimming of a mill edge. Cold rolled products are customarily furnished with cut edge. The edge cut is
usually made in the continuous pickling operation prior to the cold reduction process.
Edges - The outer boundaries of a sheet product. If untrimmed, termed Mill Edge, the rolling process squeezes the area
and causes the edges to form a semi-cylindrical, slightly ragged, profile. As it runs parallel with the rolling direction, it
deviates from a true straight line causing some slight variations in strip width. The ragged nature of a mill edge product
varies from a fine, finishing file rasp appearance, to a very jagged sawtooth appearing, condition. Micrometer readings
along a narrow band along the edge of the strip may indicate slightly less gauge thickness than that of the rest of the strip.
This condition is termed "feathering";. When blanking or shearing parts from mill edge material, sufficient width allowance
should be made to insure obtaining the shape and size of the pattern sheet. If trimmed, termed Cut Edge, the edge will
resemble the result of shearing, slitting, or trimming the mill edge. The overall width from one end of the coll to the other
will be uniform. If the product has been silt in a pickle line, the edge may exhibit some slight jaggedness, but no severe
sawtooth appearing, condition.
Electrical Sheet - Carbon Sheet Steels are widely used for electrical and magnetic applications. They are usually furnished
as one of the following: Cold Rolled Lamination Steel: Type 1 is ordinarily furnished to a controlled chemical composition,
usually carbon, manganese and phosphorous and it is provided in the full-hard or annealed condition. The annealed
product customarily receives a light temper pass to enhance flatness and punchability. Depending upon the application,
the purchaser may choose to anneal the stamped laminations to achieve better magnetic properties. Magnetic properties
are not normally guaranteed by the steel producer. Cold Rolled Lamination Steel Type 2 is a specialty product available
in the annealed condition with magnetic properties superior to Type 1. The improved magnetic properties are attained by
special mill processing and controlled chemical composition, usually carbon, manganese and phosphorus. In the last stage
of mill processing, special emphasis may be placed on obtaining high extensions during temper rolling. To obtain optimum
magnetic properties, it is necessary that the consumer anneal to adequately decarburize and promote grain growth.
Applications motors, generators, ballast transformers. Availability in coils and cut lengths.
Electrogalvanized - A thin coating of zinc applied by electrolytic deposition to a Cold Rolled substrate. Electrogalvanized
usually has less corrosion resistance than hot dipped galvanized, but with very good paintability.
Edge, Belled - Excessive buildup of material on edge(s) during a rewinding operation. Typical causes include excessive
edge burr, turned edge, and "dog bone"; shaped cross sectional profiles.
Edge, Corrugated - Severe bending (like a washboard) along a coil/sheet edge caused by improper rolling practice.
Usually will occur in a belled edge shape.
Edge, Damaged - Sheet/coil edge that has been bent, torn or scraped by an object.
Edge Break - Edge(s) with a crossbreak surface defect.
Edge Breaks - Coil breaks are a defect originating at the strip edges, progressing towards the center of the strip for
varying distances.
Edge Buckle - Similar to center buckle but occurring along one or both edges.
Edge Buildup - A heavier coating (zinc, aluminum) concentration at the edge(s) rather than the center of the coil.
Edge Wave - A condition in the band of steel where the edges (in the direction of rolling) are longer than the center.
Edging - The process of applying a particular shape (i.e., round, square) to a slit edge.
Elongation - The amount of extension a test specimen undergoes to fracture during tensile testing. A measurement
compares a before and after unit gauge length indexed into the specimen. The change is expressed numerically as a
percentage of the original gauge length.
Extra Smooth Galvanized - Extra-smooth finish is imparted to galvanized sheet by temper rolling after coating to obliterate
the spangle in the zinc coating. Most extra-smooth galvanized sheet is intended for painted sheet applications.
Elasticity - The ability of steel to return to its native shape and dimensions.
Electrical Sheet -Carbon sheet steels coated with magnesium and/or core plate are widely used for electrical and
magnetic applications.
Electrogalvanlzed - A commonly used term to describe steel that has been plated with zinc using an electric current
through an electrolyte. Proper name is Electrolytic Zinc Coated Sheet.
Electrolyte - 1. An ionic conductor. 2. A liquid bath, most commonly a solution of chemical salt or salts, that will conduct
an electric current.
Electrolytic Tin Coated Sheet Steel - Steel plated with tin using an electric current through an electrolyte.
Electrolytic Zinc Coated Sheet - Proper name for Electrogalvanized.
Electrolytic Zinc Iron - Steel plated with 10% to 20% iron and zinc, using an electric current to achieve a "layering"; of
Zinc Iron produced in the Galvannealed Process.
Elongation - A measurement of ductility/drawability. Expressed as the increase (%) of a given distance (usually 2")
prior to fracture during tensile test.
Elongation - In tensile testing, the increase in the gauge length, measured after fracture of the specimen within the gauge
length, usually expressed as a percentage of the original gauge length.
ES - Refer to Extra Smooth.
Extra Deep Drawing Special Killed - A new variation of DQSK with very low carbon content to enhance deep drawing
characteristics. Basically for automotive applications
Extra Smooth Galvanized - Spangle free for more uniform surface appearance and/or to improve paintability.
F
Floppers - Floppers are lines or ridges which are diagonally transverse to the direction of rolling and generally confined to
the section midway between the edges of a coil as rolled. They are somewhat irregular and tend toward a flat arc shape.
Finishes - The degree of surface smoothness, expressed as peaks per inch, or micro-inches. of a temper rolled or skin
passed steel strip. Surface reflectivity, brightness, dullness.
Flaking - A condition in coated sheet where portions of the coating become loosened due to inadequate adhesion.
Flatness - Flatness is a measure of a cut length sheet's ability to conform to a flat horizontal surface. Maximum deviation
from that surface is the degree to which the sheet is out of flat.
Flatness - Is a measure of a cut length sheet's ability to conform to a flat horizontal surface. Maximum deviation from that
surface is the degree to which the sheet is out of flat.
Flatness - Measurement of a sheet's conformance to a flat horizontal surface. Maximum variance from the surface (wave)
is the extent to which the sheet is out-of-flat.
Fluting - A breaking or kinking condition caused by aging or improper processing.
Fluting - Fluting is a series of sharp parallel kinks or creases occurring in the arc when sheet steel is formed cylindrically,
as to stretch the outer surface well beyond its yield point.
Forming Steel (FS) - Softer than Commercial Steel, this category was previously known as Drawing Quality (DQ). It
applies to coated sheet products, i.e., Galvanized, Galvannealed, Aluminized.
Fracture - A break in steel, first observed at the surface. Friction Scratches - A series of short abrasions caused by the
rubbing of laps or sheets. Also called galling. Scratches are shallow; gouges are deep.
Friction Digs - A series of relatively short scratches variable in form and severity.
Full Hard (FH) - Steel rolled without subsequent annealing. Defined by a Rockwell higher than B84, with elevated Yield
and Tensile strengths and very low elongation. Not suited for severe bending or drawing.
G
G - As a coating designator designates Free Zinc.
Galvanized - A term long used to describe steel sheet coated with zinc. The term is associated with the hot -dip process
but the zinc coating can also be applied by electroplating. The hot-dip process consists of passing the steel through a
bath of molten zinc. (See Hot-dipped Steel.) The electroplating process consists of the application of zinc by electrolytic
deposition.
Galfan - Steel coated (by hot-dip method) with a molten alloy that Is 95% zinc, 5% aluminum-mischmetal.
Galling - Friction scratches.
Galvalume - Steel coated (by hot-dip method) with a molten alloy that is 55% aluminum, 43.5% zinc, and 1.5% silicon.
Galvannealed - A type of hot-dipped galvanized with an iron-alloy layer to enhance paintability. Has a medium-light gray,
smooth appearance. Offers corrosion protection similar to regular hot-dipped Galvanized.
Gauge - A number representing steel's nominal thickness (within minimum and maximum tolerances).
Galvalume - Cold Rolled sheet with a coating of aluminum (55%) and zinc (43%). The coating is applied in a continuous
hot-dip process (similar to galvanized). It offers outstanding rust resistance (typically, 3x that of Galvanized).
Galvalume can be ordered to various coating weights.
Galvannealed - Is a galvanized sheet steel which is altered by heat treatments or other processes immediately after
coating, before the zinc solidifies. The coating produced consists entirely of iron zinc alloy and has a rougher
appearance than the surface of regular coating. This is known as 'galvannealed' steel. Sheets produced in this manner are
dull gray in color, have no spangle, and after proper preparation, is well suited for painting.
Galvanized - A cold rolled or hot rolled pickled substrate upon which zinc is applied to promote corrosion resistance.
There is a direct correlation between the amount of zinc applied and the steel's rust protection. Zinc can be applied
by either a hot-dipped or electrolytic deposit process.
Ghost Lines - Ghost lines are lineal irregularities in the surface which develop in drawing. They are parallel to the direction
of rolling.
Glossmeter - Instrument used to compare the reflectivity of finishes.
Gouge - A deep scratch.
H
Hardness, Hardness Tests - Hardness is the resistance of a material to deformation, particularly permanent deformation,
indentation or scratching. There is no absolute scale for hardness; therefore, to express hardness quantitatively, each type
of test has its own scale of arbitrarily defined hardness. For sheet steel the primary method used is the Rockwell
hardness test.
Half Hard - Referring to Cold Rolled with a Rockwell range of B70-85. Normally will only accept an approximate 90
degree bend on 1T diameter without fracture.
Hardness - Resistance of steel to surface penetration. Usually referenced by a Rockwell hardness number, i.e., B60.
High Strength Steel - A specific class of low alloy steels in which increased mechanical properties and, usually, good
resistance to atmospheric corrosion are obtained with moderate amounts of one or more alloying elements other than
carbon. Preferably called high-stength , low-alloy steels.
High Strength Steel - Commonly known as High Strength-Low Alloy (HSLA) a specific class of low alloy steels in which
increased mechanical properties and usually good resistance to atmospheric corrosion are obtained with moderate
amounts of one or more alloying elements other than carbon. Galvanized flat steel sheets (HSLA) are coated with zinc by
the continuous hot-dip process. You can also achieve high strength through physical, not chemical, properties.
Hot-Dip Steel - This product is a steel sheet with a zinc coating that is applied by passing the steel through a bath of
molten zinc in a continuous operation. The zinc enhances the corrosion resistance of the steel sheet. The
product Is available with various thicknesses of zinc coating. The coating thickness (weight) should be chosen carefully,
with attention to the type of environment in which the sheet is expected to serve. In general, the corrosion
resistance of the coating is directly proportional to the coating thickness.
Healed Over Scratch - Healed Over Scratch is a scratch that occurred in a mill operation and was partially masked in
subsequent rolling. It might open up during forming.
Heat Ridge - Usually referring to Hot Rolled, a hump in the rolling direction usually resulting from a trapped center buckle
after cold reduction.
Heat - The amount of steel produced from a production lot.
Heavy Coating - Excessive amount of coating (i.e., zinc or aluminum) applied to the surface.
High Carbon - Steel with carbon content exceeding 0.50%.
High Strength Low Alloy - Group of steels in which strength is achieved by the precise addition of alloying elements (i.e.,
Columbium, Vanadium, Molybdenum, Titanium).
High Strength - Product intended for uses calling for higher strength levels, usually starting at 35,000# minimum yield
strength.
Hole - A metal void, usually caused by a non-metallic inclusion during rolling.
I
Interstitial Free (IF) - Steel A relatively new form of sheet product with very high ductility for deep drawing. Usually
produced via vacuum-degassing and nitrogen. IF steel contains very low carbon (.008 max.), manganese .20 max., and
titanium.
ID - The inside diameter of a coil.
Impact Testing - Procedure to determine the resistance of steel to fracturing under extreme conditions.
Inclusions - Particles of foreign material (i.e., oxides, silicates, sulfides) in steel, usually compromising physical integrity.
These particles of non-metallic material usually oxides, sulfides, silicates and such are entrapped mechanically or are
formed during solidification or by subsequent reaction within the solid metal.
Intermediate Temper - Cold Rolled hardness referenced within a 15-point Rockwell range, i.e. Quarter Hard B60-75.
Iron - A metallic element. However, In the steel Industry, Iron represents the product of a blast furnace containing 92%
to 94% Iron. Blast furnace Iron Is also called pig Iron or hot metal.
Iron - A metallic element. However, in the steel industry, iron represents the product of a blast furnace containing 92% to
94% iron. Blast furnace iron is also called pig iron or hot metal.
Iron - A raw material of and the most prevalent element in carbon steel, representing about 99% of the chemical
composition. Chemical symbol Fe.
Iron-Zinc Coating - (See Galvannealed and electro Zinc-iron).
I.S.M. - Institute of Supply Management (formerly National Association of Purchasing Managers).
J
JIT – Just in time delivery.
K
Killed Steel - Steel deoxidized by silicon or aluminum to reduce the oxygen content to a minimum so that no reaction
occurs during solidification of the metal. Kilted Steels have more uniform properties and chemical composition than
other types.
Killed Steel - In conjunction with Drawing Steel, material is deoxidized (using Aluminum) to allow for uniform chemical
composition and freedom from age hardening.
Kink - An abrupt bend or deviation from flat which is caused by localized bending during handling.
L
Lock Forming Quality (LFQ) - This quality should be specified when sheet is subject to machine lock forming for end
uses such as heating and air conditioning duct work. Lock Forming Quality sheet will be furnished to ASTM
A-527 when specified.
Lamination (a.k.a. Segregation or Piping) - Defect caused by the presence of internal blisters, seams or inclusions.
Harmful to structural integrity; could cause steel fracturing.
Laminations - Imperfections resulting from the presence of blisters, seams or foreign inclusions, and sometimes visible on
the surface of the metal.
Lap Weld - Coil ends are "lapped" over one another and welded or stitched for production purposes. As a
result, the thickness of the steel is doubled at the weld area.
Long Terne Sheet -Is produced by passing the steel through a molten bath of terne metal (lead and tin alloy) in a
continuous coating operation. The terne coating provides the steel sheet with a number of enhancements for a variety of
applications. It provides good corrosion resistance for fuel tank applications. The terne coating is very ductile and acts as
a lubricant for parts that involve deep drawing. The coating provides a surface that is readily solderable for
electronic-component chassis applications. Also, the terne coating (without the passivation treatment) is paintable without
any special surface preparation.
Lead - Improves machinability of steel. Chemical symbol Pb.
Leveling - Flattening of coil through series of rollers to reduce or eliminate distortions in thickness, shape and/or surface
quality.
LFQ - Abbreviation for Lock Forming Quality.
Light Matte Finish - Cold Rolled surface intended for a smoother painted or plated coating. Usually has a profilometer
range of 20-40 microinches.
Line Stop - Referring to coated steels, an area of a coil where the coating line was halted. This region is usually
characterized by irregular and questionable coating integrity.
Lockforming Quality (LFQ) - Galvanized sheet ability to accept machine lock forming, usually a back-to-back 180??
bend on 1t diameter. Commonly used in ductwork. The LFQ designation has been replaced by Commercial Steel (CS).
Lockseam Test - Procedure conducted on Galvanized to determine zinc adherence to the substrate.
Loose Wrap - A coil that is not wound tight due to insufficient tension when winding.
Low Carbon - Steel with carbon content below 0.25%.
LT - Abbreviation for Long Ternes.
Lubricity - Slipperiness. The ability of steel sheet to slide in a forming die.
Luders Lines - Elongated surface markings or depressions appearing in patterns caused by localized plastic deformation
that results from a discontinuous yield and resulting yield point elongation.
M
Mark, Bite - Lines which are generally perpendicular to the rolling direction, caused by the leading end of the metal
entering the leveling rolls resulting in minor surface disruptions. These disruptions then transfer to the surface of the
rolled metal in subsequent rotations.
Manganese - Contributes to hardness and strength, but less than carbon. Tends to minimize segregation. Usually
beneficial to surface quality. Chemical symbol Mn.
Mark, Arbor - Surface damage at/near coil ID caused by roughened, damaged or non-circular arbor.
Mark, Chatter (Roll or Leveler) - Close, intermittent lines transverse to the rolling direction.
Mark, Inclusion - Appearance of surface where actual inclusion or the void it left is observed.
Mark, Knife - A continuous scratch (which may also be creased) near a slit edge, caused by sheet contacting the slitter
knife.
Mark, Roll Bruise - A greatly enlarged roll mark whose height or depth is very shallow.
Mark, Roll skid - Scratch like, repeating patterns perpendicular to rolling direction. Usually caused by work roll
misalignment.
Mark, Roll - A small repeating raised or depressed area on rolled products caused by the opposite condition on a roll.
The repeat distance is a function of the offending roll diameter.
Mark, Rub - A large number of very fine scratches or abrasions. A rub mark can occur by metal-to-metal contact,
movement in handling and movement in transit.
Mark, Whip - Surface abrasions generally diagonal to rolling direction. Typically caused by fluttering of coil between
leveling rolls.
Martensite - An ultra-high strength form of steel with tensile strengths ranging from 130000-215000 psi.
Matte Finish - A specified Cold Rolled surface roughness (or brightness), measured with a profilometer.
Mechanical Properties -Those properties of a material that are associated with the elastic reaction when force is applied,
or that Involve the relationship between stress and strain; for example modulus of elasticity or endurance limit. These
properties are often incorrectly referred to as physical properties. Refers to structural characteristics, i.e., tensile strength,
yield strength, hardness and bend ability.
Micrometer - Instrument used to ascertain steel thickness.
Mild Steel - Usually refers to carbon steel with a Carbon of 0.15% maximum.
Mill Edge - Standard edge used in Hot Rolled. Does not have a definite shape; has liberal width tolerances. M (continued)
Minimum Spangle - In hot-dipped Galvanized, refers to a relatively small flower like crystallization pattern.
Minimized or Minimum Spangle - See Spangles
Mischmetal - A mixture of rare earths. Cerium (0.04% and Lanthanum (0.04%). In aluminum-zinc alloy steel. Type 1
contains the two rare earth elements. Trade Name Galfan
Mixed Coil - A fully-coated coil whose surfaces contain more than one coating, i.e., both regular galvanized (bright) and
galvannealed (dull).
Molybdenum - Sometimes used in high-strength low-alloy grades for increased yield and tensile strengths. Chemical
symbol Mo.
Motor Lamination/Electrical Sheet - A type of Cold Rolled sheet engineered for use as electromagnetic core material for
electrical equipment (i.e., motors, transformers).
N
Necking - A narrowing of coil width caused by improper tension in rolls during production.
Niobium - Commonly referred to as Columbium. Often used in high-strength low-alloy steels for increased yield and
tensile strengths. Chemical symbol Nb.
Nitrogen - Tends to increase hardness, yield and tensile strengths. Contributes to age hardening effects. Chemical
symbol N.
O
Oiled - Application of a suitable oil to flat rolled steel to retard rusting. When surface is a consideration, it is also desirable
in reducing friction scratches that may develop in transit. The oil coating is not intended to serve as a lubricant for
subsequent fabrication.
Olsen Test - This is a cupping test made on an Olsen machine as an aid in determining ductility and deep drawing
properties. The test simulates a deep drawing operation. It is continued until the cup formed from the steel sample
fractures. Ductility and drawing properties are judged by the depth of the cup, position of the break, condition of the
surface after the break, etc.
OD - The outside diameter of a coil.
Out-of-Square - The difference between two diagonal measurements of a square or rectangular or square sheet or blank,
also the deviation from 90 degree angles at the corners between the sides and ends, of a rectangular or square sheet or
blank.
Off Gauge - Thickness deviation from the ordered specification and/or tolerances.
Oil Can - A tight wave or undulation, also referred to as a trapped center
buckle.
Oiled - An application of a suitable oil formulation to a sheet steel product for the purpose of minimizing rusting during
transit or storage and reduce friction scratches possibly occurring during transit.
Oiling - The practice of applying the protective oil encompassing its formulation and the amount used.
Orange Peel Strain - Orange Peel Strain is a pebbly surface condition which develops during drawing.
Orange Peel - Orange Peel is the course grain condition which becomes evident during drawing.
Orange Peel - Surface roughening on formed products which occurs when large grains in the metal are present.
Oscillation - Uneven wrap in coiling and lateral travel during winding. Improper alignment of rolls over which the metal
passes before rewinding and insufficient rewind tension are typical causes.
Overpickled - Excessively-prolonged exposure to pickling acids, usually resulting in a burnt or stained surface.
Overwidth - Width exceeding the ordered dimension.
Oxidation - Rust,corrosion. The exposure of steel to air (oxygen). Over time, it may result in stain, pitting and reduction
in strength.
P
Passivation Treatment - As applied to galvanized sheet is a relatively invisible, thin chemical film that is applied to the
surface of the coated sheet to minimize the tendency to "white rust"; (humid storage stain) during transit and storage. It is
more effective than oil in preventing white rust. The product may be ordered without a passivation treatment to
accommodate certain post-painting operations.
Paint Bond - See Phosphatized
Pattern Roll - see Embossed or Embossing
Phosphatized -Refers to a surface treatment applied by the mill to provide a paintable surface. The treatment is a visible
phosphate film (dull surface). It provides a surface that is readily paintable and enhances the paint adherence
characteristics. (Sometimes referred to as bonderizlng.)
Physical Quality (PQ) - Also known as Structural Quality, (SQ). There are applications where strength in the finished
part is closely related to the strength of the steel sheet as ordered. For these end uses, Physical Quality
should be specified. Sheets of this quality can be specified to ASTM A653 ( old ASTM A-446).
PIW - Designates pounds per inch of width of a coil. Determined by taking coil weight and dividing by width. For
example, a 24000# coil at 24" wide is 1000 piw. The piw will also correlate to coil ID and OD measurements; the
larger the piw, the larger the OD. Generally, larger coil PIWs are preferred since they require less production machinery
setup time.
Plating Quality - Two finishes suitable for most plating applications: Commercial Bright rolled with ground and polished
rolls, has a relatively bright finish. Extra Light Matte produced with lightly blasted rolls, has a slightly duller finish than
Commercial Bright. Base metal conforms to ASTM A653 ( old ASTMA-366).
Peeling - On galvanized, aluminized and other metallic-coated steels, the separation of the coating from the steel substrate.
Peeling - The detachment of zinc coating from the base metal at the zinc steel interface.
Porcelain Enameling Sheets (Vitrename) - Sheet steel for porcelain enameling is chemically constituted and suitably
processed to adapt it to the fabricating and enameling requirements of articles for vitreous coating under proper
conditions. This product is generally produced in two types. Type I has an extremely low carbon level commonly
produced by decarburizlng in an open coll process. In which the coil laps are separated for easy flow of annealing gases.
When specified by the purchaser, this material is suitable for direct cover coat and enameling applications. This material is
also suitable for ground and cover coat enameling practice. It has good sag resistance and good formability. Type II has
moderately low carbon and manganese levels as produced in the melting operation. This material is suitable for ground
and cover coat applications. The selection of chemical composition for Type II can be varied to provide either maximum
resistance to sag or good formability. Sheet steel for porcelain enameling can be produced to stretcher leveled standard
of flatness, resquared or sheared into circles or sketches. Type III is a titanium stabilized ultra low carbon product.
Phosphorous - Reduces ductility and toughness; tends to segregate. Chemical symbol P.
Physical Properties - The properties, other than mechanical properties, that pertain to the physics of a material: for
example, density, electrical conductivity, heat conductivity, thermal expansion.
Pickle Patch - An area of heavy scale that has not been removed after pickling or other processing.
Physical Qualities/Properties (aka Mechanical Qualities) - Refers to values of tensile, yield, elongation, Rockwell,
Erickson, Olson and/or other similar tests.
Pickle Stain or Burn Surface - Discoloration due to excessive acid solution and/or steel's exposure to same.
Pickling - Removal of mill scale or oxide by immersion of steel in a dilute solution off sulphuric or hydrochloric acid, then
rinsed and dried. Pickling - Removal of oxides and scale on Hot Rolled, through immersion in hydrochloric and/or sulfuric
acids. Usually accompanied by oiling to retard subsequent oxidation.
Pickup, Roll - Small particles of debris trapped in the rolls and transferred to the sheet surface. Could apply to Cold
Rolled or coated sheet.
Pick-Off - The transfer of portions of the coating from one surface of the sheet to an adjacent surface due to poor coating
adhesion. Usually defined as < l % total coating loss or < 10 particles of coating pulled from the surface.
Pinchers - Are fern-like ripples or creases usually diagonal to the rolling direction.
Pinholes - A coating defect consisting of random small round holes. The open area (pinhole) exposes the steel substrate.
Usually caused by laminations, inclusions, scratches or improper lubricant.
Pipe Lamination - Pipe Lamination is a separation mid way between the surfaces containing oxide inclusions.
Piping - Similar to lamination, a void in the steel's thickness.
Pitting (Coated) - Random small depressions in the coating. Similar to pinholes, except that pitting does not reveal the
bare substrate.
Pitting (Rust) - A severe form of oxidation causing sharp depressions in the steel surface.
Powdering - A problem in which Galvannealed's iron-zinc coating dislodges from the steel substrate.
Preprinted Sheet Steel - Another name for Coll Coated Steel Sheet.
Pre-Lube - Coating applied to enhance formability.
Profilometer - An instrument that measures surface-roughness height in microinches. The height is measured as the
absolute deviation from a mean surface.
PSI - Denotes pounds per square inch.
Pup Coil - A coil with relatively small P.I.W., typically under 200. They often contain defects, i.e., dents, dings, scratches.
P.I.W. - Pounds per Inch of Width.
Q
Quality - Refers to the suitability of the steel for the purpose or purposes for which it is intended (see Commercial
Quality, Drawing Quality, Structural Quality).
Quarter Hard - In Cold Rolled, hardness of B60-75. Suitable for only limited bending and forming.
R
Rimmed Steel -OLD STEEL MAKING- A low carbon steel grade that is cast into molds without using strong
deoxidizing elements (aluminum or silicon) so that the principal steel making reaction, carbon combining with oxygen to
form a gas, continue as the liquid metal solidifies. The marked evolution of the gas (CO) causes the surfaces nearest the
mold walls to be lower in carbon, sulfur, and phosphorus than the core of the ingot. This grade exhibits a wide range of
chemistry across the cross section of the strip. Sheet and strip products produced from rimmed steel ingots have excellent
surface characteristics.
Ragged Edges - Sheet edges that are cracked, torn, ragged, split and/or otherwise damaged.
Rockwell - A test measurement to determine hardness. In low carbon steels, Rockwell can indicate approximate yield
and tensile strengths. To get tensile strength simply multiply Rockwell by 1,000. For example B53 will approximate a
53,000 tensile strength (53 x 1,000 = 53,000). To get yield strength, multiply Rockwell by 1,000 and subtract total by
20,000. For example, a B53 Rockwell will approximate a 33,000 yield ([53 x 1,000] - 20,000 = 33,000).
Rockwell Hardness Conversion - A test for determining the hardness of a sheet steel can be converted to another scale
by referring to the tables in ASTM E140.
Reduction - Reducing thickness of sheet or strip by hot or cold rolling.
Reel Breaks - Surface blemishes (indicated by kinks across the coil width) caused by the winding arbor. Horizontal
creases near a coil ID (or OD if rewound).
Ridge - A surface hump down the length of a sheet/coil.
Regular Matte - Finish The most common Cold Rolled surface with a uniform dull finish. Usually suitable for painting.
Profilometer range usually about 35-65 microinches.
Resquaring - A method of shearing or blanking to meet closer than standard width, length and out of square tolerances.
Rockwell Hardness Number - A number derived from the net increase in depth of impression as the load on an indenter
is increased from a fixed minor load to a major load and then returned to the minor load. Penetrators for the Rockwell
hardness test include carbide balls of several specified diameters and a diamond sphereconical penetrator having an
included angle of 120 degrees with a spherical tip having a radius of 0.2mm. Rockwell hardness numbers are always
quoted with a scale symbol representing the penetrator, load and dial used. To minimize errors and misunderstanding, it is
suggested that hardness numbers be specified to the same scale as that used during testing. Rockwell and Rockwell
Superficial scales using the 1/16th inch diameter carbide ball indenter are commonly used for testing sheet steel. In thin
sheet material, lighter loads and scales should be used depending on thickness and hardness. Rockwell hardness test
results are used as indications of the formability of sheet material and to express tempers (see ASTM E18, Standard
Method of Test for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials). Rockwell Hardness
Test Forcing a cone-shaped diamond or carbide ball into the specimen being tested under standard pressure. The depth
of penetration is an indication of the Rockwell Hardness.
Rockwell Hardness Number - The number expressed to indicate the hardness and Rockwell scale used for the Rockwell
Hardness Test.
Roll Grind - The uniform ground finish on the work rolls which is imparted to the sheet or plate during rolling.
Rolled-in Metal - An extraneous chip or particle of metal rolled into the surface of the product.
Rolled-in Scale - A defect resulting from scale being rolled into the steel surface.
Rolled-in-Dirt - This is extraneous matter rolled Into the surface of the sheet.
Rolled-in-Scale - This consists of scale partially rolled into the surface of the sheet.
Rollforming - Fabrication method in which steel (usually coil) is linearly, progressively deformed by passing through a
consecutive series of rolls to produce a predetermined profile.
Roping - A rope-like appearance in the rolling direction after the metal has undergone severe deformation. This condition
is caused by the presence of irregular grains in the rolled product before being deformed.
Rust - Corrosion caused by exposure over time to atmosphere, chemicals or other injurious elements. Usually, Hot
Rolled and Cold Rolled turn orange/red. Galvanized and Aluminized turn white to black.
S
Secondary Steel - Material that does not meet the original customer's specifications in terms of thickness, width, surface,
chemistry or physical properties. Sold at a discount compared to prime steel, secondary may be quite suitable for other
applications.
SAE - Society of Automotive Engineers
Salt Spray Test - A procedure to determine the coating longevity of steel when exposed to corrosive effects of saltwater.
Semi Killed Steel -OLD STEEL MAKING- A low carbon steel grade that is cast into molds using very carefully
measured amounts of the strong deoxidizing elements (aluminum or silicon) so that the principal steehnaklng reaction,
carbon combining with oxygen to form a gas continues as the liquid metal solidifies. The addition of the deoxidizing agent
alters the evolution of gas (CO). The amount evolved is more than would be observed in the casting of killed steel, but
significantly less than the amount evolved by a rimmed steel. The amount of deoxidizing agent used determines the amount
of gas evolved. Semi-killed sheet chemistry exhibit variable degrees of uniformity somewhat intermediate to the killed and
rimmed grades.
Scale, Mill - An iron oxide formed on the surface of hot steel, some times in the form of large sheets which fall off when
the steel is rolled.
Scale - Iron oxides which form on the surface of Hot Rolled during or subsequent to rolling. Scale can be removed by
Pickling.
Scotch Brite - A scratch pattern surface induced by brushing with textured rolls. Can often reduce or eliminate light rust.
Scratch - Scoring or indentation of varying degree in the surface. Usually caused by rollers or during handling.
Spangle - In hot-dipped galvanizing, the visual manifestation of zinc when it solidifies. Appearing like a snowflake, spangle
can be controlled in size and brightness. Regular Spangle is typically 3/8" - 3/4";. Minimum Spangle is approximately 1/8"
Extra-Smooth has no spangle as a result of surface rolling after galvanizing. Zero spangle has no spangle, as a result of
zinc pot chemistry.
Spangles - Regular Spangle, (a.k.a. bright Spangle), is produced by allowing the zinc to cool and crystallze, normally
without restriction. forming a flower like pattern on the surface about 1/2" in diameter and larger. This type of sheet is
used for ductwork, pails, garbage cans. etc. Minimized or minimum spangle is produced by restricting or retarding the
spangle growth by the use of steam, water, or air applied as the strip emerges from the molten zinc pot. The process
not only restricts the diameter of the spangle, but also reduces the profile or height of the spangle. Sheet coll produced
with this surface is usually used for painted products. Regular apatugle is not usually suitable for painting, because
if only a thin coat of paint is used the spangle might show through. Also, the high relief on regular spangle does lend itself
to a smooth painted surface. It is also usually advisable if the steel is to be painted or laminated on a continuous coating
line, to order it extra smooth, that is, skin passed or temper rolled after galvanizing.
Seam - A surface crack sometimes caused during casting or hot-rolling.
Segregation - A nonuniformity in chemical composition occurring during solidification. Often associated with internal
defects, i.e., lamination and piping.
Special Killed Steel -OLD STEEL MAKING- This is generally a low carton aluminum killed steel, although the producer
sometimes uses other deoxidizers to obtain the desired characteristics. Special killed steel is intended for applications
where cold rolled carbon sheet is to be essentially free from significant changes in mechanical properties over a period of
time. This product is normally supplied to be essentially free from surface disturbances, such as stretcher strains or
fluting, without roller leveling. Special killed steel can be used for hot rolled carbon sheet steel when it is to be cold
reduced by the purchaser and properly processed to have the characteristics described above.
Stain, Oil - Surface discoloration which may vary from dark brown to white and is produced during thermal treatment by
incomplete evaporation and/or oxidation of the surface by the lubricants. Stainless Steel - Strip steels with high chrome
content to impede corrosion.
Sheet - A rolled product rectangular in cross section and form of thickness 0.006 through 0,249 inch with sheared, silt or
sawed edges.
Sheet - Flat-rolled steel generally less than .250" in thickness and wider than 12". The formula to calculate steel sheet
weight is: thickness (in.) x width (in.) x length (in.) x density (.2833 lb./cubic inch).
Sidewall (SW) - The contour of a coil's sides and edges. Ideally, they are free of damage, smooth and straight.
Stretcher Leveling - A method of developing superior flatness in a steel sheet by gripping the ends of the sheets with
especially designed grippers and pulling it mechanically just beyond its yield point. More commonly termed Tension
Leveling , a method of developing superior flatness in a steel coil by passing it through equipment designed to pull the
strip, while it is in motion, just beyond its yield point.
Silicon - A deoxidizing element in steelmaking; very slight tendency to segregate; generally detrimental to surface quality.
Chemical symbol Si.
Streak, Dirt - Surface discoloration which may vary from grey to black, is parallel to the direction of rolling, and contains
rolled in foreign debris. It is usually extraneous material from an overhead location that drops onto the rolling surface and
is shallow enough to be removed by etching or buffing.
Streak, Roll - A non-uniform surface appearance parallel to the rolling direction. It is caused by an uneven wiping action
on the upper backup roll(s) of a mill which transfers first to the work roll and then to the rolled product.
Skin Lamination - Seam or inclusion at surface resembling a blister. Could lead to metal fracture.
Skin Lamination - This is a sub-surface separation which usually results in a surface rupture.
Skip - An area of uncoated sheet which is frequently caused by equipment malfunction.
Stretcher Strains - These are vein-like surface defects which may appear in low carbon steel during cold deformation.
They are associated with the irregular movememt of the metal when it is being strained at the yield point Stretcher
strains are also known as "Luder's lines", "strain figures", etc.
Slab - A semifinished steel block having an oblong cross-section in which width is at least twice thickness. It differs from
a bloom which has a square or nearly square, cross-section.
Slab - A semi-finished steel block having an oblong cross-section in which width is at least twice thickness. It differs from
a bloom which has a square or nearly square, cross-section.
Slab - The primary steel shape from which coils are then rolled.
Slit Edge - An edge produced from slitting; typically tighter width tolerances than mill edge or cut edge.
Slitting - Close tolerance rotary cutting of flat rolled products. This is a continuous cutting of a sheet or coil into narrower
widths. The longitudinal splitting of the overall width of a flat product through rotary knives mounted on a rotating arbor to
reduce the original width or to cut two or more separate strips.
Sliver - Thin fragments of steel which are part of the material but only partially attached. Typically caused by surface
damage or internal inclusions which are subsequently rolled. They are somewhat similar in appearance to skin
laminations but usually more prominent.
Structural Steel (SS) - A steel quality specified when the minimum finished part strength (usually in load-bearing
applications) is required. Commonly specified in minimum yield strength (i.e., 33000 psi, 40000 psi, 50000 psi, or 80000
psi).
Smudge - A dark film of debris, sometimes covering large areas, deposited on the sheet during rolling.
Snaking - A series of reversing lateral bows in coil products. This condition is caused by a weaving action during an
unwinding or rewinding operation.
Structural Quality (SQ) - When mechanical property values other than bend tests, such as tensile or yield point
elongation, Rockwell hardness or similar tests are specified or required. This quality is also identified as physical quality,
and the term structural (physical) quality is now in use.
Special Killed Steel (Drawing Quality-DDS) - A sheet with maximum uniformity used for severe drawing or forming
operations. Has maximum ductility plus freedom from age hardening and fluting. Conforms to ASTM A620 now ASTM
A1008.
Special Killed -OLD STEEL MAKING- Steel with improve grain structure and prolong ductility through the addition of
aluminum and/or silicon and the removal of oxygen and nitrogen.
Spelter - Referring to Galvanized or Aluminized, a severe coating buildup resulting in a non-uniform surface. Spooled Coil
- A coil having edges that are turned up or down (like a spool of thread).
SQ - Designation for Structural Quality.
Stamping - Metalworking operation involving the cutting and forming of steel using tooling and dies.
Starvation - Non-uniform coating application which results in absence of coating in certain areas. This condition can be
caused by mismatch of applicator roll and sheet surface velocities.
Sticker Breaks - These are arc-shaped types of coil breaks usually located near the middle of the sheet.
Strain - The amount of elongation or compression when steel is subjected to a specific load.
Streak, Coating - A banded condition caused by non-uniform coating during the initial application process.
Streak, Grinding - A streak with a helical pattern appearance transferred to rolled products from the work rolls.
Streak, Leveler - A streak on the sheet surface in the rolling direction caused by transfer from the leveler rolls.
Stress - The force per unit area caused by externally produced forces.
Stretcher Leveled - Flatness exceeding commercial tolerances, often specified for panels or similar applications.
Stretcher Leveling - A method of producing unusual flatness in steel sheets by stretching them in a hydraulic device (see
Tension Leveling).
Stretcher Strains - Irregular lines that develop during drawing or stretching. Also called fluting.
Striation - A coating flow defect appearing as near-parallel lines.
Strip Steel - Flat rolled steel produced to precise thickness and/or narrow width tolerances.
Structural Quality (SS) - When mechanical property values other than bend tests, such as tensile or yield point elongation,
Rockwell hardness or similar tests are specified or required.
Substrate - The base metal for coated steel products can be either hot rolled, P&O, cold rolled steel, or high strength low
alloy.
Sulfur - A chemical element that tends to lower ductility and weldability; prone to foster segregation; impairs surface
quality. Chemical symbol S.
Suppressed Spangle - A spangle pattern somewhat like regular (minimized) spangle finish, except the spangles do not
exhibit as much surface relief. This finish is often desired for prepalnted galvanized sheet.
Surface Tear - Minute surface cracks on rolled products which can be caused by caster cracks.
T
Telescoping - Lateral stacking, primarily in one direction, of wraps in a coil so that the sidewall of the coil is conical rather
than flat. Usually caused by improper alignment of rolls over which the steel passes before rewinding.
Tandem Mill - A progressive series of rolling mill stations in which coils are cold-worked, primarily to reduce thickness
and improve flatness.
Temper - A condition produced in sheet steel by mechanical, chemical or thermal treatment. A given steel may be in the
fully softened of annealed temper, or it may be cold worked to the hard temper, or further to spring temper. Intermediate
tempers produced by cold working (rolling) are called "quarter-hard", "half-hard", and "three-quarters hard", and are
determined by the amount of cold reduction.
Tension Leveling - This term denotes a mechanical operation wherein sheet steel in coil form is passed through a unit
which stretches the product beyond its yield point. This is a process for improving flatness in coils by pulling in
tensions. The purpose is to provide a sheet with superior flatness characteristics. The stretch unit may be a separate
operation or in tandem with another processing unit such as a galvanizing line.
Temper - Refers to steel hardness resulting from mechanical, chemical and/or thermal properties. Generally produced by
cold-reduction, typical classifications are soft, quarter-hard, half-hard, three-quarter hard, and full hard.
Temper Passing (skin rolling) – Bands and annealed cold rolled are especially susceptible to wave, center buckle,
crossbreaks and minor surface defects. A slight cold reduction corrects these problems. Temper rolling can vary from
0.05 to 3.0%.
Temper, Leveling - A flexing of a sheet by passing through a series of rolls, to improve flatness. Usually reduces or
eliminates crossbreaks, center buckle.
Tensile Strength - The maximum tensile stress which a material is capable of sustaining. Tensile strength is calculated from
the maximum load during the tension test carried to rupture and the original cross sectional area of the specimen.
Tension Leveled - Flat rolled product that has been passed through rollers which stretch the material beyond its yield
point, producing improved flatness.
Terne - See Long Terne Metal
Triple Spot test - A process for measuring the coating weights, representing the average weight from three samples taken
across a coil/sheet width. This test is the reason Kieh Co. was started. Take the test pieces 2" from an edge - at the
centerline - 2" from the other edge.
Theoretical Weight - Sheet and strip products, sold at the theoretical weight calculated on the basis of the minimum
specified, thickness, width and length.
T Bend - A mechanical procedure in which a steel sheet is bent 180 degrees with the inside bend diameter expressed in
terms of the material thickness. A bend of 1T is equivalent to the material thickness; a 2T bend equals twice the material
thickness.
Theoretical Weight - Sheet and strip products, sold at the theoretical weight calculated on the basis of the minimum
specified thickness, width and length.
Tin - Chemical symbol Sn.
Tin-Plate - Very light gauge Cold Rolled with electrolytically-deposited tin on both sides. Used for the manufacture of
cans.
Titanium - Often used in high-strength low-alloy steels for increased yield and tensile strengths. Also used in EDDS steels
to increase ductility. Chemical symbol Ti.
Tolerance - Permissible variation in dimensions (thickness, width, length, diagonal).
Tolerance - The allowed range of deviation from a specified dimension of specified chemical element.
Ton - A unit of weight measurement. A net ton is 2,000 pounds. A metric ton is 2,204.6 pounds. A gross (or long) ton is
2,240 pounds.
Transit Rust - Oxidation occurring during shipment. Typically appears most prominently on ID and OD wraps, top and
bottom sheets, and at edges. It may manifest in sporadic spots within coil or sheet bundle.
Transition Coil - A coil that is partially Electrogalvanized coated and partially bare Cold Rolled.
Transverse - Perpendicular to the direction of rolling. Traverse Winding (a.k.a. oscillate) - Coils that are wound like a
fishing reel. In contrast to ribbon winding.
T.M.W. - Theoretical Minimum Weight (See Theoretical Weight)
U
U - As a coating designator ... designates unexposed part.
Ultimate Strength - See tensile strength.
Ultimate Tensile Strength - The maximum stress which a material is capable of sustaining in tension under a gradual and
uniformly applied load.
V
Vacuum Degassing - An advanced steelmaking process that removes oxygen and nitrogen. It is used to produce very
pure ultra-low carbon steels with high drawing and formability features, especially for automotive body applications.
Vacuum Degassing - A method to remove oxygen, hydrogen, and nitrogen from steel. The removal of these elements
occurs under very low pressures (vacuum). Developed due to continuous casting operations.
Vanadium - Often used in high-strength low-alloy steels for increased yield and tensile strengths. Chemical symbol V.
Vitrenamel Sheet - Cold rolled sheet that has been especially processed for porcelain enameling operations.
Vitreous Enameling Iron - A type of Cold Rolled sheet produced for porcelain enameling. Has very low carbon levels
and a rough matte finish (typically 55+ microinches).
Void - An internal cavity produced during the solidification process during casting.
W
Water Stain - Superficial oxidation of the surface with a water film, in the absence of circulating air, held between closely
adjacent metal surfaces such as between wraps of a coil or sheets of a stack. The appearance varies from
iridescent in mild cases to white, gray, or black in more severe instances.
Wave - An out of flat condition relative to the order or ASTM flatness specifications. Can occur across the width or
merely at edge(s).
Water Stain - Superficial surface oxidation due to the reaction of water films held between closely adjacent metal surfaces
such as between wraps of coll or sheets in a stack. The appearance varies from iridescent in mild cases to white, gray, or
black in more severe instances.
Weld (Coil) - Area where coils have been welded together to form a single, longer length for more efficient production.
The area near the weld is typically of poor quality in terms of strength, surface and coating adhesion.
Weld - A joining or union of steel, created by the application of very high temperatures.
Weldability - The adaptability of steel to welding, typically influenced by chemical composition, surface finish, coating
type and weight.
White Rust - On galvanized, corrosion that occurs when material is exposed to moisture and is unable to quickly dry,
often between adjacent wraps or sheets. Varies in severity and coverage area.
White Rust - See water stain.
Work Hardening - The increase in resistance to deformation as a result of cold-working, i.e., rolling, rollforming.
Wrap-Loose - A condition in a coil due to insufficient tension which creates a small void between adjacent wraps.
Wrinkling - A coating defect of small ridges or folds resembling a small prune skin.
X
X - As a coating designator...designates no coating...i.e. one-side.
Y
Yield Point - The load per unit of original cross-section area at which a marked increase in the deformation of the
specimen occurs with out increase of load. It is usually calculated from the load determined by the drop of the beam of the
testing machine or by use of dividers.
Yield Point Elongation (YPE) - Refers to a non-uniform elongation of steel and resulting susceptibility to Luders bands
(surface strain lines, resembling crossbreaks). The deformation can be measured and while there is no accepted
industry standard, generally a YPE measurement below 0.5% would suggest an absence of strain lines during/after
stamping.
Yield Strength - The stress at which steel exhibits a specified deviation from a linear proportionality between load and
elongation. For steel (and many other metals) an offset of 0.2% is the reference point. If steel is sufficiently
stretched, the length is increased. The measurement point at which the length permanently increases by 0.2% represents
the yield strength. For example, if a load is applied upon a steel sample, any 1.000" of its length becomes 1.002" after
loading to the yield strength. Yield strength is lower than tensile strength, since the steel will "give" before it fractures.
Yield - The amount of net finished product generated in relation to the initial gross amount. (Not to be confused with
Yield Point.) Yield Point Elongation
(YPE) - Refers to a non-uniform elongation of steel and resulting susceptibility to Luders bands (surface strain lines,
resembling crossbreaks). The deformation can be measured and while there is no accepted industry standard, generally a
YPE measurement below 0.5% would suggest an absence of strain lines during/after stamping.
Yield Point - The load or stress at which a marked increase in deformation (i.e., elongation or discontinuous thickness
reduction) occurs without increasing the applied load.
Yield Strength - The stress at which a material exhibits a specified deviation from proportionality of stress and strain.
0.2% offset is commonly used for metals. At this point the metal will no longer return to its original shape.
Z
Zinc Stringers - Surface blemishes peculiar to galvanized sheet steel are sometimes encountered. Among the most
common are zinc stringers, coarse coating and zinc ridges. When zinc adherence Is good and proper coating weights are
present, these surface blemishes have no harmful effect on the life of the sheet.
Zinc - A chemical element applied (either hot-dipped or electrolytically) to steel to improve corrosion resistance. There is
a direct correlation between the zinc coating weight and rate of atmospheric corrosion; the more the zinc, the slower the
corrosion. Chemical symbol Zn.
Zincrometal - Steel covered by the roll coated process with a base coat of zinc-chromium alloy, and a topcoat of a
weldable zinc-rich primer.
or electrolytlcally applied.
Aluminum Zinc Alloy Coated Steel Sheets (Galvalume) - A carbon steel product continuously hot dipped coated,
nominally by weight, with 55% aluminum. 1.6% silicon, and the balance Zinc. The product is intended for applications
requiring corrosion resistance, heat resistance, or both.
AASHTO - American Association of State Highway and Transportation
Annealing - A process of controlled heating, soaking at elevated temperatures, and controlled cooling for the purposes of
softening, developing a grain structure, improve machability, or obtaining a special set of physical or mechanical
properties.
ASTM - American Society for Testing and Materials. Organization which sets technical standards and specifications for
steel and other materials, systems, services, etc. Generally, ASTM standards constitute the "laws" governing
steel products.
Age Hardening - A process in which steel increases hardness and strength and ordinarily decreases ductility over time.
Special Killed (i.e., aluminum killed) prevents that condition.
Aging - Changes in physical and mechanical properties that occur when low carbon steel is stored for some time. Aging is
also accelerated by exposure of steel to elevated temperatures. Stretcher strains and fluting can result from aging.
Aging - (a.k.a. Age Hardening) A process in which steel increases hardness and strength and decreases ductility over
time. Special killed (i.e., aluminum killed) prevents that condition.
AISI - American Iron & Steel Institute. No longer writes chemical specifications. The SAE has taken over the task.
Alloy Coated - When a metallic coating, through heat treating, becomes a part of the base metal. i.e. galvannealed,
aluminum zinc, long ternes.
Aluminized - A cold-rolled sheet with aluminum applied (by hot-dip process) to the top and bottom sides. Provides
excellent heat resistance and very good corrosion resistance.
Aluminum Coated Steel Sheets - Type 1 a carbon steel product continuously hot dipped coated with an aluminum coating
containing 5 to 10 percent silicon Heat resistant grade used for heat exchangers and automotive mufflers.
Aluminum Coated Steel Sheets - Type 2 a carbon steel product continuously hot dipped coated with a pure aluminum.
Combines the strength of the steel substrate and the corrosion resistance and reflectivity of the pure aluminum.
Aluminum Killed - see Special Killed.
Aluminum – Deoxidizes the steel and ties up Nitrogen. This combined action improves ductility. Chemical symbol
Al.
Annealing - A process involving the controlled high-temperature heating and subsequent cooling of as-rolled (usually
Full-Hard) Cold Rolled or Hot Rolled to induce softness and greater formability.
B
Black Plate - Cold reduced sheet steel ranging in width from over 12 inches to less than 32 inches and in gauge from 29
(.0135) and lighter, in coil or cut lengths, and within the uniform Classification of Flat Rolled Carbon Steel Products.
Bake Hardenable Steel - A grade of Cold Rolled sheet with good dent resistance, especially common in automobile
doors and panels.
Band - A basic form of Hot Rolled coil. As rolled from the hot strip mill. Usually has a 28” to 30” ID.
Usually has an as rolled curved head (ID) and irregular fish tail (OD).
Black Plate - The uncoated steel sheet product before electrotinning. An A.I.S.I. Flat Rolled Carbon Steel Product
Classification for a cold rolled coil or cut length product ranging in width from over 12" to less than 32". and
29 gauge (0.013”) or lighter.
Buckle, Arbor Bends - Creases, wrinkles, or departures from flat, occurring perpendicular to the slit edge of a coil and
which are repetitive in nature, with severity decreasing as the distance increases in the coil from the original source. Often
they are found at/near the coil ID or OD.
Bend, Longitudinal - A bend in the direction of (with) the grain; easier bend
Bend, Transverse - A bend perpendicular to (against) the grain; harder bend
Bend Radius - Inside radius of a bent section, normally indicated as a factor of material thickness (T). 1-T bend diameter
= 1/2-T bend radius.
Bend Test - Tests used to determine steel ductility in which material is bent (with or against the grain).
Billet - A hot-worked semi finished product suitable for subsequent working by such methods as rolling, forging,
extruding, etc.
Black Plate - A specific form of light gauge (typically under .016”) Cold Rolled sheet, usually used as feedstock
for Tinplate.
Blank - A generally-small steel sheet, typically with restrictive width, length and diagonal tolerances.
Blister - In coated products, a defect caused by the formation of gas bubbles in a zinc or aluminum coating. In uncoated,
refers to a raised spot on the steel surface evidencing inclusions and small laminations.
Blisters - A defect produced by gas bubbles.
Bonderized - A proprietary name for a phosphate treated steel or metallic coated substrate. See Phosphatized.
Bonderized - Hot-dipped galvanized that has been phosphate-treated for improved paintability. Same corrosion
resistance and formability as regular galvanized. A medium-dark gray surface with some spangle appearance.
Boron - Improves ductility by combining with nitrogen. Increases hardenability, by slowing down the transformation rate.
Chemical symbol B.
Bow, Longitudinal - Curvature in the plane of sheet or plate in the rolling direction. Usually caused by unbalanced stresses
between the top and bottom surfaces of the rolled product - Coil set -.
Bow, Transverse - Curvature across the rolling direction of sheet. A more severe case can result in a center buckle.
Usually caused by unbalanced roll bending during the hot rolling - Canoe shape -.
Box Annealing - Annealing steel by heating in a sealed container under conditions that minimize oxidization.
Buckle, Center - Undulations (wavy regions) in the center of the metal.
Buckle, Edge - Undulations (wavy regions) along the edge(s) of the metal.
Buckle - A distortion (usually repetitive) in flatness during rolling.
Build Up Coil - A coil made by welding (or stitching) together two or more coils to make a larger one, often for efficiency
during the galvanizing process.
Burr - A thin ridge of roughness left by a cutting operation such as slitting, trimming, shearing, blanking or sawing.
Burred Edge - A thin turned down edge on sheet resulting from shearing or slitting. Only the Perforating Association has a
suggested 10% of metal thickness as a listed maximum tolerance.
C
Camber - The tolerance for a coil or cut length product, as in a sheet product, the deviation from edge straightness. The
amount is determined along the concave side using a straight edge an expressed as a measurement per unit length, e.g..
1" in 20'.
Camber - Camber is the deviation of a side edge from a straight line, the measurement being taken on the concave side
with a straight edge.
Carbon - Main hardening element in steel. Usually, as carbon increases: tensile increases; ductility and weldability
decreases. Chemical symbol C.
Capped Steel -OLD STEEL MAKING- Capped Steels have characteristics similar to those of rimmed steels but to a
degree intermediate between those of rimmed and semi-killed steels. Capped steels are not as segregated and are harder
than rimmed steels. Because of the increased hardness of sheet produced from mechanically capped steel, this type is not
generally used where severe forming is involved. However, this grade is satisfactory for most applications where only mild
forming or bending is required. Generally, steels of this type are above, 0.15% carbon and are applied to sheet, strip,
skelp and tin plate.
Carbon Steel - Steel which owes its properties chiefly to carbon without substantial amounts of other alloying elements;
also known as straight carbon steel or plain carbon steel. Steel is classified as carbon steel when the maximum content
does not exceed the following percentages: Manganese: 1.65; Silicon: 0.60; Copper: 0.60 (when specified).
Center Buckle - A wave condition in the coil/sheet, caused by the center (in the rolling direction) being longer than the
edges.
Chemical Treatment - Process for passivating a galvanized coating to retard the formation of "wet storage stains"; during
shipment and storage. Most chemical treatment is used to prevent storage stains. Process for preparing a surface for
painting. See Phosphatized.
Cold Rolled Sheet Steel - A flat rolled steel product classification produced to an ordered thickness by cold reducing a
heavier gauge hot rolled coil. The cold reduced coil (full hard) is subjected to additional processing. The coil could be run
through a continuous coating line; or softened in a controlled anneal and temper rolled.
Commercial Quality (CQ now CS) - Sheet of this quality is for uses involving simple bending or moderate drawing.
Commercial Quality sheet can be bent flat upon Itself in any direction at room temperature. (Sheets of this quality can be
specified to ASTM A526 now ASTM A1008) (full hard) is subjected to additional processing, continuous line,
controlled annealing, and temper rolling to produce un-coated cold rolled sheet steel products.
Con Cast Steel - There is a large scale production of continuous cast slabs, steels of this type have been found to be
equal to and often better than conventional cast steels of the same nominal grade. One of the biggest
metallurgical advantages is the uniformity of chemical composition and mechanical properties as compared to ingot cast
steels. This results from the fact that the continuous cast slab solidifies in a few minutes, whereas in an
ingot, complete solidification is not obtained until hours have gone by. Chemical segregation, characteristic of ingot cast
steel, is virtually absent in continuous cast slabs.
Chemical/Chromate Treatment - A chemical solution applied to galvanized to further forestall rust.
Chromium - Hardens steel and prevents rust. Is prominent in Stainless steel. Chemical symbol Cr.
Continuous Annealing -The heat treating process performed in a line designed to unwind a steel coil, pass it through a
controlled atmosphere furnace in a single thickness, cool it at a controlled rate, and rewind it for shipment to its next
destination.
Continuously Cast Steel - A process involving the pouring of liquid steel continuously as it solidifies into a desired shape,
square, rectangular, or other cross section. The shape is with drawn from the mold according to a calculated rate based
upon the cross section being cast. The metered rate of the liquid metal, the available cooling and other factors.
Corrosion, Water Stain - Superficial oxidation of the surface in the absence of circulating air. Often caused by moisture
trapped between closely adjacent metal surfaces such as between wraps of a coil or sheets of a stack. On Hot Rolled and
Cold Rolled products the color is typically yellow, orange and/or red. On Galvanized, it's often a whitish color but can
also range to black.
Crease - A sharp deviation from flat in the sheet which is transferred from processing equipment subsequent to the roll
bite. If longitudinal, typical sources include idler rolls, leveler rolls, segmented rolls and slitter spacers. If transverse,
typical sources include mandrels, coil ends and racks.
Coating, High or Low - Failure to meet the proper coating weight range.
Coating Build-Up - A coating thickness greater than nominal due to uneven application.
Coating Designation - 'G' Free Zinc, 'A' Zinc-Iron Alloy (Galvannealed), 'X' No Coating. i.e.. One Side Coated
(Metric), 'E' Exposed Part (Metric), or 'U' Unexposed Part grams/m^3 (Metric)
Coating Drip - A non-uniform extraneous deposit of coating on the coated sheet.
Coating Ridge - On coated steels, a hump in the rolling direction usually caused by improper wiping when exiting the
coating tank.
Coating Weight - The amount of zinc and/or aluminum applied to Galvanized, Electrogalvanized, or Aluminized sheet,
normally expressed in oz./ft2.
Coil Breaks - A deficit, exhibiting creases, a river type appearing, snaky pattern across a metal sheet running transverse
to the coiling or rolling direction. The spacing is irregular and its location in the surface is very often random. Creases of
ridges which appear as parallel lines, transverse to the direction of rolling. They generally extend across the width of the
sheet.
Coil Coated Sheet Steel - Also termed prepainted. Is a sheet steel product exhibiting a paint, plastic, or non-metallic film
on one or both of its surfaces. Coil Set - Longitudinal bow in an unwound coil, caused by the action of winding the sheet
into a coil.
Cold Rolled Products - Flat rolled products for which the approximate required thickness has been obtained by rolling
HR bands without heating at approximately room temperature.
Cold Rolling - Passing of Hot Rolled coils through work rolls to reduce and tighten thickness range, improve shape and
surface quality.
Coll Weld - A coil weld is a joint between two lengths of metal within a coil. Coil welds are not always visible in a cold
reduced product.
Collapsed Coil - Out-of-round condition of coil often due inappropriate tension during rewinding operations. The internal
diameter (ID) is compressed.
Columbium - Often used in high-strength low-alloy steels for increased yield and tensile strengths. Also referred to as
Niobium. Chemical symbol Cb.
Continuous Annealing - A process in which steel coils are unwound and passed through a furnace where they are
subjected to a prescribed annealing cycle under a protective atmosphere.
Copper - Increases atmospheric corrosion resistance. Chemical symbol Cu.
Corrosion (a.k.a. Rust) - Degradation of metal caused by atmospheric conditions, i.e., moisture, oxygen, chemicals.
There are varying degrees of severity, i.e., extent across surface, depth of penetration into surface.
Corrosion - Gradual chemical or electrochemical attack on a metal by atmospheric moisture or other agents. The
deterioration is caused by chemical attack via. an electrolytic based reaction within an environment.
Cracks, Edge - Tears or discontinuity on the coil/sheet edge.
Crossbow - A curvature across the width of the strip perpendicular to the rolling or coiling direction.
Crossbreaks - Refer to Coil Breaks.
Crown - The contour on a sheet where the thickness increases from the edges to the center.
Cut Edge - More defined than mill edge, usually associated with tighter width tolerances.
D
Deferentially Coated - Instead of exhibiting the same coating weight, or designation, per side of the sheet, this product will
have contrastingly different coating weights on each side, i.e. one side will have a light coating and the other side will have
a heavy coating.
Deep Drawing Special Killed Fully Stabilized (DDQSK-IF) - Explanation same as Extra Deep Drawing. Produced from
vacuum degassed steel to eliminate coll breaks. strain lines, and fluting during fabrication.
Drawing Quality (DQ-DS) - An A.S.T.M. designation for uncoated or metallic coated sheet steel intended for a
specifically identified part where the draw or deformation is moderately severe. The steel manufacturer selects the steel
grade, chemistry, and the processing to make the identified part.
Drawing Quality Special Killed (DQSK-DDS) - When Drawing Quality will not provide a sufficient degree of ductility for
fabrication of parts or applications require that the sheet be free from aging. Drawing Quality Special Killed steel should
be used. This quality is made by special steel making and processing practices. Also sometimes known as deep drawing
quality.
Dead Soft - Material that has not been rolled or tempered following annealing. Characterized by very low hardness, yield
strength, tensile strength with comparatively-high elongation.
Debur - To remove sharp edges from a slit or cut edge.
Deep Drawing - A press forming process utilizing the plastic flow characteristics of a metal to form deep cup or pan
shapes with deeply recessed turns or comers.
Density - The mass per unit volume of a substance. The density of carbon steel is .2833 pounds per cubic inch.
Dent - A sharply defined surface impression on the metal which may be caused by a blow from another object.
Dirt - Foreign debris embedded in or under the coating from rolling or post-rolling operations.
Drawing Quality Aluminum Killed (DQAK) - Specially killed steel using aluminum as the deoxidizing agent.
Drawing Quality (DQ) - As compared with sheet of Commercial Quality, Drawing Quality sheet has a greater degree of
ductility and is more consistent in performance.
Drawing Steel (DS) - For applications involving ductility beyond Commercial Steel (CS).
Dross - Drops of sediment atop galvanized sheet.
Ductility - The ability to permit change of shape without fracture. In steel, ductility is usually measured by elongation and
reduction of area as determined in a tensile, hardness, or Olsen test.
E
E - An A.S.T.M. designation for Exposed (parts)
Edges, Mill - Normal edge produced in hot rolling and it does not conform to any definite contour. Mill edge product may
contain some edge imperfections the more common types of which are, checked edges, thin edges (feather) and damaged
edges due to handling or processing. These edge conditions are detrimental where joining of the mill edges by welding is
practiced. When the customer intends to shear or blank, a sufficient width allowance should be made by the purchaser to
assure obtaining the desired shape and size of the pattern sheet. A cut edge is the normal edge which results from the
shearing, slitting or trimming of a mill edge. Cold rolled products are customarily furnished with cut edge. The edge cut is
usually made in the continuous pickling operation prior to the cold reduction process.
Edges - The outer boundaries of a sheet product. If untrimmed, termed Mill Edge, the rolling process squeezes the area
and causes the edges to form a semi-cylindrical, slightly ragged, profile. As it runs parallel with the rolling direction, it
deviates from a true straight line causing some slight variations in strip width. The ragged nature of a mill edge product
varies from a fine, finishing file rasp appearance, to a very jagged sawtooth appearing, condition. Micrometer readings
along a narrow band along the edge of the strip may indicate slightly less gauge thickness than that of the rest of the strip.
This condition is termed "feathering";. When blanking or shearing parts from mill edge material, sufficient width allowance
should be made to insure obtaining the shape and size of the pattern sheet. If trimmed, termed Cut Edge, the edge will
resemble the result of shearing, slitting, or trimming the mill edge. The overall width from one end of the coll to the other
will be uniform. If the product has been silt in a pickle line, the edge may exhibit some slight jaggedness, but no severe
sawtooth appearing, condition.
Electrical Sheet - Carbon Sheet Steels are widely used for electrical and magnetic applications. They are usually furnished
as one of the following: Cold Rolled Lamination Steel: Type 1 is ordinarily furnished to a controlled chemical composition,
usually carbon, manganese and phosphorous and it is provided in the full-hard or annealed condition. The annealed
product customarily receives a light temper pass to enhance flatness and punchability. Depending upon the application,
the purchaser may choose to anneal the stamped laminations to achieve better magnetic properties. Magnetic properties
are not normally guaranteed by the steel producer. Cold Rolled Lamination Steel Type 2 is a specialty product available
in the annealed condition with magnetic properties superior to Type 1. The improved magnetic properties are attained by
special mill processing and controlled chemical composition, usually carbon, manganese and phosphorus. In the last stage
of mill processing, special emphasis may be placed on obtaining high extensions during temper rolling. To obtain optimum
magnetic properties, it is necessary that the consumer anneal to adequately decarburize and promote grain growth.
Applications motors, generators, ballast transformers. Availability in coils and cut lengths.
Electrogalvanized - A thin coating of zinc applied by electrolytic deposition to a Cold Rolled substrate. Electrogalvanized
usually has less corrosion resistance than hot dipped galvanized, but with very good paintability.
Edge, Belled - Excessive buildup of material on edge(s) during a rewinding operation. Typical causes include excessive
edge burr, turned edge, and "dog bone"; shaped cross sectional profiles.
Edge, Corrugated - Severe bending (like a washboard) along a coil/sheet edge caused by improper rolling practice.
Usually will occur in a belled edge shape.
Edge, Damaged - Sheet/coil edge that has been bent, torn or scraped by an object.
Edge Break - Edge(s) with a crossbreak surface defect.
Edge Breaks - Coil breaks are a defect originating at the strip edges, progressing towards the center of the strip for
varying distances.
Edge Buckle - Similar to center buckle but occurring along one or both edges.
Edge Buildup - A heavier coating (zinc, aluminum) concentration at the edge(s) rather than the center of the coil.
Edge Wave - A condition in the band of steel where the edges (in the direction of rolling) are longer than the center.
Edging - The process of applying a particular shape (i.e., round, square) to a slit edge.
Elongation - The amount of extension a test specimen undergoes to fracture during tensile testing. A measurement
compares a before and after unit gauge length indexed into the specimen. The change is expressed numerically as a
percentage of the original gauge length.
Extra Smooth Galvanized - Extra-smooth finish is imparted to galvanized sheet by temper rolling after coating to obliterate
the spangle in the zinc coating. Most extra-smooth galvanized sheet is intended for painted sheet applications.
Elasticity - The ability of steel to return to its native shape and dimensions.
Electrical Sheet -Carbon sheet steels coated with magnesium and/or core plate are widely used for electrical and
magnetic applications.
Electrogalvanlzed - A commonly used term to describe steel that has been plated with zinc using an electric current
through an electrolyte. Proper name is Electrolytic Zinc Coated Sheet.
Electrolyte - 1. An ionic conductor. 2. A liquid bath, most commonly a solution of chemical salt or salts, that will conduct
an electric current.
Electrolytic Tin Coated Sheet Steel - Steel plated with tin using an electric current through an electrolyte.
Electrolytic Zinc Coated Sheet - Proper name for Electrogalvanized.
Electrolytic Zinc Iron - Steel plated with 10% to 20% iron and zinc, using an electric current to achieve a "layering"; of
Zinc Iron produced in the Galvannealed Process.
Elongation - A measurement of ductility/drawability. Expressed as the increase (%) of a given distance (usually 2")
prior to fracture during tensile test.
Elongation - In tensile testing, the increase in the gauge length, measured after fracture of the specimen within the gauge
length, usually expressed as a percentage of the original gauge length.
ES - Refer to Extra Smooth.
Extra Deep Drawing Special Killed - A new variation of DQSK with very low carbon content to enhance deep drawing
characteristics. Basically for automotive applications
Extra Smooth Galvanized - Spangle free for more uniform surface appearance and/or to improve paintability.
F
Floppers - Floppers are lines or ridges which are diagonally transverse to the direction of rolling and generally confined to
the section midway between the edges of a coil as rolled. They are somewhat irregular and tend toward a flat arc shape.
Finishes - The degree of surface smoothness, expressed as peaks per inch, or micro-inches. of a temper rolled or skin
passed steel strip. Surface reflectivity, brightness, dullness.
Flaking - A condition in coated sheet where portions of the coating become loosened due to inadequate adhesion.
Flatness - Flatness is a measure of a cut length sheet's ability to conform to a flat horizontal surface. Maximum deviation
from that surface is the degree to which the sheet is out of flat.
Flatness - Is a measure of a cut length sheet's ability to conform to a flat horizontal surface. Maximum deviation from that
surface is the degree to which the sheet is out of flat.
Flatness - Measurement of a sheet's conformance to a flat horizontal surface. Maximum variance from the surface (wave)
is the extent to which the sheet is out-of-flat.
Fluting - A breaking or kinking condition caused by aging or improper processing.
Fluting - Fluting is a series of sharp parallel kinks or creases occurring in the arc when sheet steel is formed cylindrically,
as to stretch the outer surface well beyond its yield point.
Forming Steel (FS) - Softer than Commercial Steel, this category was previously known as Drawing Quality (DQ). It
applies to coated sheet products, i.e., Galvanized, Galvannealed, Aluminized.
Fracture - A break in steel, first observed at the surface. Friction Scratches - A series of short abrasions caused by the
rubbing of laps or sheets. Also called galling. Scratches are shallow; gouges are deep.
Friction Digs - A series of relatively short scratches variable in form and severity.
Full Hard (FH) - Steel rolled without subsequent annealing. Defined by a Rockwell higher than B84, with elevated Yield
and Tensile strengths and very low elongation. Not suited for severe bending or drawing.
G
G - As a coating designator designates Free Zinc.
Galvanized - A term long used to describe steel sheet coated with zinc. The term is associated with the hot -dip process
but the zinc coating can also be applied by electroplating. The hot-dip process consists of passing the steel through a
bath of molten zinc. (See Hot-dipped Steel.) The electroplating process consists of the application of zinc by electrolytic
deposition.
Galfan - Steel coated (by hot-dip method) with a molten alloy that Is 95% zinc, 5% aluminum-mischmetal.
Galling - Friction scratches.
Galvalume - Steel coated (by hot-dip method) with a molten alloy that is 55% aluminum, 43.5% zinc, and 1.5% silicon.
Galvannealed - A type of hot-dipped galvanized with an iron-alloy layer to enhance paintability. Has a medium-light gray,
smooth appearance. Offers corrosion protection similar to regular hot-dipped Galvanized.
Gauge - A number representing steel's nominal thickness (within minimum and maximum tolerances).
Galvalume - Cold Rolled sheet with a coating of aluminum (55%) and zinc (43%). The coating is applied in a continuous
hot-dip process (similar to galvanized). It offers outstanding rust resistance (typically, 3x that of Galvanized).
Galvalume can be ordered to various coating weights.
Galvannealed - Is a galvanized sheet steel which is altered by heat treatments or other processes immediately after
coating, before the zinc solidifies. The coating produced consists entirely of iron zinc alloy and has a rougher
appearance than the surface of regular coating. This is known as 'galvannealed' steel. Sheets produced in this manner are
dull gray in color, have no spangle, and after proper preparation, is well suited for painting.
Galvanized - A cold rolled or hot rolled pickled substrate upon which zinc is applied to promote corrosion resistance.
There is a direct correlation between the amount of zinc applied and the steel's rust protection. Zinc can be applied
by either a hot-dipped or electrolytic deposit process.
Ghost Lines - Ghost lines are lineal irregularities in the surface which develop in drawing. They are parallel to the direction
of rolling.
Glossmeter - Instrument used to compare the reflectivity of finishes.
Gouge - A deep scratch.
H
Hardness, Hardness Tests - Hardness is the resistance of a material to deformation, particularly permanent deformation,
indentation or scratching. There is no absolute scale for hardness; therefore, to express hardness quantitatively, each type
of test has its own scale of arbitrarily defined hardness. For sheet steel the primary method used is the Rockwell
hardness test.
Half Hard - Referring to Cold Rolled with a Rockwell range of B70-85. Normally will only accept an approximate 90
degree bend on 1T diameter without fracture.
Hardness - Resistance of steel to surface penetration. Usually referenced by a Rockwell hardness number, i.e., B60.
High Strength Steel - A specific class of low alloy steels in which increased mechanical properties and, usually, good
resistance to atmospheric corrosion are obtained with moderate amounts of one or more alloying elements other than
carbon. Preferably called high-stength , low-alloy steels.
High Strength Steel - Commonly known as High Strength-Low Alloy (HSLA) a specific class of low alloy steels in which
increased mechanical properties and usually good resistance to atmospheric corrosion are obtained with moderate
amounts of one or more alloying elements other than carbon. Galvanized flat steel sheets (HSLA) are coated with zinc by
the continuous hot-dip process. You can also achieve high strength through physical, not chemical, properties.
Hot-Dip Steel - This product is a steel sheet with a zinc coating that is applied by passing the steel through a bath of
molten zinc in a continuous operation. The zinc enhances the corrosion resistance of the steel sheet. The
product Is available with various thicknesses of zinc coating. The coating thickness (weight) should be chosen carefully,
with attention to the type of environment in which the sheet is expected to serve. In general, the corrosion
resistance of the coating is directly proportional to the coating thickness.
Healed Over Scratch - Healed Over Scratch is a scratch that occurred in a mill operation and was partially masked in
subsequent rolling. It might open up during forming.
Heat Ridge - Usually referring to Hot Rolled, a hump in the rolling direction usually resulting from a trapped center buckle
after cold reduction.
Heat - The amount of steel produced from a production lot.
Heavy Coating - Excessive amount of coating (i.e., zinc or aluminum) applied to the surface.
High Carbon - Steel with carbon content exceeding 0.50%.
High Strength Low Alloy - Group of steels in which strength is achieved by the precise addition of alloying elements (i.e.,
Columbium, Vanadium, Molybdenum, Titanium).
High Strength - Product intended for uses calling for higher strength levels, usually starting at 35,000# minimum yield
strength.
Hole - A metal void, usually caused by a non-metallic inclusion during rolling.
I
Interstitial Free (IF) - Steel A relatively new form of sheet product with very high ductility for deep drawing. Usually
produced via vacuum-degassing and nitrogen. IF steel contains very low carbon (.008 max.), manganese .20 max., and
titanium.
ID - The inside diameter of a coil.
Impact Testing - Procedure to determine the resistance of steel to fracturing under extreme conditions.
Inclusions - Particles of foreign material (i.e., oxides, silicates, sulfides) in steel, usually compromising physical integrity.
These particles of non-metallic material usually oxides, sulfides, silicates and such are entrapped mechanically or are
formed during solidification or by subsequent reaction within the solid metal.
Intermediate Temper - Cold Rolled hardness referenced within a 15-point Rockwell range, i.e. Quarter Hard B60-75.
Iron - A metallic element. However, In the steel Industry, Iron represents the product of a blast furnace containing 92%
to 94% Iron. Blast furnace Iron Is also called pig Iron or hot metal.
Iron - A metallic element. However, in the steel industry, iron represents the product of a blast furnace containing 92% to
94% iron. Blast furnace iron is also called pig iron or hot metal.
Iron - A raw material of and the most prevalent element in carbon steel, representing about 99% of the chemical
composition. Chemical symbol Fe.
Iron-Zinc Coating - (See Galvannealed and electro Zinc-iron).
I.S.M. - Institute of Supply Management (formerly National Association of Purchasing Managers).
J
JIT – Just in time delivery.
K
Killed Steel - Steel deoxidized by silicon or aluminum to reduce the oxygen content to a minimum so that no reaction
occurs during solidification of the metal. Kilted Steels have more uniform properties and chemical composition than
other types.
Killed Steel - In conjunction with Drawing Steel, material is deoxidized (using Aluminum) to allow for uniform chemical
composition and freedom from age hardening.
Kink - An abrupt bend or deviation from flat which is caused by localized bending during handling.
L
Lock Forming Quality (LFQ) - This quality should be specified when sheet is subject to machine lock forming for end
uses such as heating and air conditioning duct work. Lock Forming Quality sheet will be furnished to ASTM
A-527 when specified.
Lamination (a.k.a. Segregation or Piping) - Defect caused by the presence of internal blisters, seams or inclusions.
Harmful to structural integrity; could cause steel fracturing.
Laminations - Imperfections resulting from the presence of blisters, seams or foreign inclusions, and sometimes visible on
the surface of the metal.
Lap Weld - Coil ends are "lapped" over one another and welded or stitched for production purposes. As a
result, the thickness of the steel is doubled at the weld area.
Long Terne Sheet -Is produced by passing the steel through a molten bath of terne metal (lead and tin alloy) in a
continuous coating operation. The terne coating provides the steel sheet with a number of enhancements for a variety of
applications. It provides good corrosion resistance for fuel tank applications. The terne coating is very ductile and acts as
a lubricant for parts that involve deep drawing. The coating provides a surface that is readily solderable for
electronic-component chassis applications. Also, the terne coating (without the passivation treatment) is paintable without
any special surface preparation.
Lead - Improves machinability of steel. Chemical symbol Pb.
Leveling - Flattening of coil through series of rollers to reduce or eliminate distortions in thickness, shape and/or surface
quality.
LFQ - Abbreviation for Lock Forming Quality.
Light Matte Finish - Cold Rolled surface intended for a smoother painted or plated coating. Usually has a profilometer
range of 20-40 microinches.
Line Stop - Referring to coated steels, an area of a coil where the coating line was halted. This region is usually
characterized by irregular and questionable coating integrity.
Lockforming Quality (LFQ) - Galvanized sheet ability to accept machine lock forming, usually a back-to-back 180??
bend on 1t diameter. Commonly used in ductwork. The LFQ designation has been replaced by Commercial Steel (CS).
Lockseam Test - Procedure conducted on Galvanized to determine zinc adherence to the substrate.
Loose Wrap - A coil that is not wound tight due to insufficient tension when winding.
Low Carbon - Steel with carbon content below 0.25%.
LT - Abbreviation for Long Ternes.
Lubricity - Slipperiness. The ability of steel sheet to slide in a forming die.
Luders Lines - Elongated surface markings or depressions appearing in patterns caused by localized plastic deformation
that results from a discontinuous yield and resulting yield point elongation.
M
Mark, Bite - Lines which are generally perpendicular to the rolling direction, caused by the leading end of the metal
entering the leveling rolls resulting in minor surface disruptions. These disruptions then transfer to the surface of the
rolled metal in subsequent rotations.
Manganese - Contributes to hardness and strength, but less than carbon. Tends to minimize segregation. Usually
beneficial to surface quality. Chemical symbol Mn.
Mark, Arbor - Surface damage at/near coil ID caused by roughened, damaged or non-circular arbor.
Mark, Chatter (Roll or Leveler) - Close, intermittent lines transverse to the rolling direction.
Mark, Inclusion - Appearance of surface where actual inclusion or the void it left is observed.
Mark, Knife - A continuous scratch (which may also be creased) near a slit edge, caused by sheet contacting the slitter
knife.
Mark, Roll Bruise - A greatly enlarged roll mark whose height or depth is very shallow.
Mark, Roll skid - Scratch like, repeating patterns perpendicular to rolling direction. Usually caused by work roll
misalignment.
Mark, Roll - A small repeating raised or depressed area on rolled products caused by the opposite condition on a roll.
The repeat distance is a function of the offending roll diameter.
Mark, Rub - A large number of very fine scratches or abrasions. A rub mark can occur by metal-to-metal contact,
movement in handling and movement in transit.
Mark, Whip - Surface abrasions generally diagonal to rolling direction. Typically caused by fluttering of coil between
leveling rolls.
Martensite - An ultra-high strength form of steel with tensile strengths ranging from 130000-215000 psi.
Matte Finish - A specified Cold Rolled surface roughness (or brightness), measured with a profilometer.
Mechanical Properties -Those properties of a material that are associated with the elastic reaction when force is applied,
or that Involve the relationship between stress and strain; for example modulus of elasticity or endurance limit. These
properties are often incorrectly referred to as physical properties. Refers to structural characteristics, i.e., tensile strength,
yield strength, hardness and bend ability.
Micrometer - Instrument used to ascertain steel thickness.
Mild Steel - Usually refers to carbon steel with a Carbon of 0.15% maximum.
Mill Edge - Standard edge used in Hot Rolled. Does not have a definite shape; has liberal width tolerances. M (continued)
Minimum Spangle - In hot-dipped Galvanized, refers to a relatively small flower like crystallization pattern.
Minimized or Minimum Spangle - See Spangles
Mischmetal - A mixture of rare earths. Cerium (0.04% and Lanthanum (0.04%). In aluminum-zinc alloy steel. Type 1
contains the two rare earth elements. Trade Name Galfan
Mixed Coil - A fully-coated coil whose surfaces contain more than one coating, i.e., both regular galvanized (bright) and
galvannealed (dull).
Molybdenum - Sometimes used in high-strength low-alloy grades for increased yield and tensile strengths. Chemical
symbol Mo.
Motor Lamination/Electrical Sheet - A type of Cold Rolled sheet engineered for use as electromagnetic core material for
electrical equipment (i.e., motors, transformers).
N
Necking - A narrowing of coil width caused by improper tension in rolls during production.
Niobium - Commonly referred to as Columbium. Often used in high-strength low-alloy steels for increased yield and
tensile strengths. Chemical symbol Nb.
Nitrogen - Tends to increase hardness, yield and tensile strengths. Contributes to age hardening effects. Chemical
symbol N.
O
Oiled - Application of a suitable oil to flat rolled steel to retard rusting. When surface is a consideration, it is also desirable
in reducing friction scratches that may develop in transit. The oil coating is not intended to serve as a lubricant for
subsequent fabrication.
Olsen Test - This is a cupping test made on an Olsen machine as an aid in determining ductility and deep drawing
properties. The test simulates a deep drawing operation. It is continued until the cup formed from the steel sample
fractures. Ductility and drawing properties are judged by the depth of the cup, position of the break, condition of the
surface after the break, etc.
OD - The outside diameter of a coil.
Out-of-Square - The difference between two diagonal measurements of a square or rectangular or square sheet or blank,
also the deviation from 90 degree angles at the corners between the sides and ends, of a rectangular or square sheet or
blank.
Off Gauge - Thickness deviation from the ordered specification and/or tolerances.
Oil Can - A tight wave or undulation, also referred to as a trapped center
buckle.
Oiled - An application of a suitable oil formulation to a sheet steel product for the purpose of minimizing rusting during
transit or storage and reduce friction scratches possibly occurring during transit.
Oiling - The practice of applying the protective oil encompassing its formulation and the amount used.
Orange Peel Strain - Orange Peel Strain is a pebbly surface condition which develops during drawing.
Orange Peel - Orange Peel is the course grain condition which becomes evident during drawing.
Orange Peel - Surface roughening on formed products which occurs when large grains in the metal are present.
Oscillation - Uneven wrap in coiling and lateral travel during winding. Improper alignment of rolls over which the metal
passes before rewinding and insufficient rewind tension are typical causes.
Overpickled - Excessively-prolonged exposure to pickling acids, usually resulting in a burnt or stained surface.
Overwidth - Width exceeding the ordered dimension.
Oxidation - Rust,corrosion. The exposure of steel to air (oxygen). Over time, it may result in stain, pitting and reduction
in strength.
P
Passivation Treatment - As applied to galvanized sheet is a relatively invisible, thin chemical film that is applied to the
surface of the coated sheet to minimize the tendency to "white rust"; (humid storage stain) during transit and storage. It is
more effective than oil in preventing white rust. The product may be ordered without a passivation treatment to
accommodate certain post-painting operations.
Paint Bond - See Phosphatized
Pattern Roll - see Embossed or Embossing
Phosphatized -Refers to a surface treatment applied by the mill to provide a paintable surface. The treatment is a visible
phosphate film (dull surface). It provides a surface that is readily paintable and enhances the paint adherence
characteristics. (Sometimes referred to as bonderizlng.)
Physical Quality (PQ) - Also known as Structural Quality, (SQ). There are applications where strength in the finished
part is closely related to the strength of the steel sheet as ordered. For these end uses, Physical Quality
should be specified. Sheets of this quality can be specified to ASTM A653 ( old ASTM A-446).
PIW - Designates pounds per inch of width of a coil. Determined by taking coil weight and dividing by width. For
example, a 24000# coil at 24" wide is 1000 piw. The piw will also correlate to coil ID and OD measurements; the
larger the piw, the larger the OD. Generally, larger coil PIWs are preferred since they require less production machinery
setup time.
Plating Quality - Two finishes suitable for most plating applications: Commercial Bright rolled with ground and polished
rolls, has a relatively bright finish. Extra Light Matte produced with lightly blasted rolls, has a slightly duller finish than
Commercial Bright. Base metal conforms to ASTM A653 ( old ASTMA-366).
Peeling - On galvanized, aluminized and other metallic-coated steels, the separation of the coating from the steel substrate.
Peeling - The detachment of zinc coating from the base metal at the zinc steel interface.
Porcelain Enameling Sheets (Vitrename) - Sheet steel for porcelain enameling is chemically constituted and suitably
processed to adapt it to the fabricating and enameling requirements of articles for vitreous coating under proper
conditions. This product is generally produced in two types. Type I has an extremely low carbon level commonly
produced by decarburizlng in an open coll process. In which the coil laps are separated for easy flow of annealing gases.
When specified by the purchaser, this material is suitable for direct cover coat and enameling applications. This material is
also suitable for ground and cover coat enameling practice. It has good sag resistance and good formability. Type II has
moderately low carbon and manganese levels as produced in the melting operation. This material is suitable for ground
and cover coat applications. The selection of chemical composition for Type II can be varied to provide either maximum
resistance to sag or good formability. Sheet steel for porcelain enameling can be produced to stretcher leveled standard
of flatness, resquared or sheared into circles or sketches. Type III is a titanium stabilized ultra low carbon product.
Phosphorous - Reduces ductility and toughness; tends to segregate. Chemical symbol P.
Physical Properties - The properties, other than mechanical properties, that pertain to the physics of a material: for
example, density, electrical conductivity, heat conductivity, thermal expansion.
Pickle Patch - An area of heavy scale that has not been removed after pickling or other processing.
Physical Qualities/Properties (aka Mechanical Qualities) - Refers to values of tensile, yield, elongation, Rockwell,
Erickson, Olson and/or other similar tests.
Pickle Stain or Burn Surface - Discoloration due to excessive acid solution and/or steel's exposure to same.
Pickling - Removal of mill scale or oxide by immersion of steel in a dilute solution off sulphuric or hydrochloric acid, then
rinsed and dried. Pickling - Removal of oxides and scale on Hot Rolled, through immersion in hydrochloric and/or sulfuric
acids. Usually accompanied by oiling to retard subsequent oxidation.
Pickup, Roll - Small particles of debris trapped in the rolls and transferred to the sheet surface. Could apply to Cold
Rolled or coated sheet.
Pick-Off - The transfer of portions of the coating from one surface of the sheet to an adjacent surface due to poor coating
adhesion. Usually defined as < l % total coating loss or < 10 particles of coating pulled from the surface.
Pinchers - Are fern-like ripples or creases usually diagonal to the rolling direction.
Pinholes - A coating defect consisting of random small round holes. The open area (pinhole) exposes the steel substrate.
Usually caused by laminations, inclusions, scratches or improper lubricant.
Pipe Lamination - Pipe Lamination is a separation mid way between the surfaces containing oxide inclusions.
Piping - Similar to lamination, a void in the steel's thickness.
Pitting (Coated) - Random small depressions in the coating. Similar to pinholes, except that pitting does not reveal the
bare substrate.
Pitting (Rust) - A severe form of oxidation causing sharp depressions in the steel surface.
Powdering - A problem in which Galvannealed's iron-zinc coating dislodges from the steel substrate.
Preprinted Sheet Steel - Another name for Coll Coated Steel Sheet.
Pre-Lube - Coating applied to enhance formability.
Profilometer - An instrument that measures surface-roughness height in microinches. The height is measured as the
absolute deviation from a mean surface.
PSI - Denotes pounds per square inch.
Pup Coil - A coil with relatively small P.I.W., typically under 200. They often contain defects, i.e., dents, dings, scratches.
P.I.W. - Pounds per Inch of Width.
Q
Quality - Refers to the suitability of the steel for the purpose or purposes for which it is intended (see Commercial
Quality, Drawing Quality, Structural Quality).
Quarter Hard - In Cold Rolled, hardness of B60-75. Suitable for only limited bending and forming.
R
Rimmed Steel -OLD STEEL MAKING- A low carbon steel grade that is cast into molds without using strong
deoxidizing elements (aluminum or silicon) so that the principal steel making reaction, carbon combining with oxygen to
form a gas, continue as the liquid metal solidifies. The marked evolution of the gas (CO) causes the surfaces nearest the
mold walls to be lower in carbon, sulfur, and phosphorus than the core of the ingot. This grade exhibits a wide range of
chemistry across the cross section of the strip. Sheet and strip products produced from rimmed steel ingots have excellent
surface characteristics.
Ragged Edges - Sheet edges that are cracked, torn, ragged, split and/or otherwise damaged.
Rockwell - A test measurement to determine hardness. In low carbon steels, Rockwell can indicate approximate yield
and tensile strengths. To get tensile strength simply multiply Rockwell by 1,000. For example B53 will approximate a
53,000 tensile strength (53 x 1,000 = 53,000). To get yield strength, multiply Rockwell by 1,000 and subtract total by
20,000. For example, a B53 Rockwell will approximate a 33,000 yield ([53 x 1,000] - 20,000 = 33,000).
Rockwell Hardness Conversion - A test for determining the hardness of a sheet steel can be converted to another scale
by referring to the tables in ASTM E140.
Reduction - Reducing thickness of sheet or strip by hot or cold rolling.
Reel Breaks - Surface blemishes (indicated by kinks across the coil width) caused by the winding arbor. Horizontal
creases near a coil ID (or OD if rewound).
Ridge - A surface hump down the length of a sheet/coil.
Regular Matte - Finish The most common Cold Rolled surface with a uniform dull finish. Usually suitable for painting.
Profilometer range usually about 35-65 microinches.
Resquaring - A method of shearing or blanking to meet closer than standard width, length and out of square tolerances.
Rockwell Hardness Number - A number derived from the net increase in depth of impression as the load on an indenter
is increased from a fixed minor load to a major load and then returned to the minor load. Penetrators for the Rockwell
hardness test include carbide balls of several specified diameters and a diamond sphereconical penetrator having an
included angle of 120 degrees with a spherical tip having a radius of 0.2mm. Rockwell hardness numbers are always
quoted with a scale symbol representing the penetrator, load and dial used. To minimize errors and misunderstanding, it is
suggested that hardness numbers be specified to the same scale as that used during testing. Rockwell and Rockwell
Superficial scales using the 1/16th inch diameter carbide ball indenter are commonly used for testing sheet steel. In thin
sheet material, lighter loads and scales should be used depending on thickness and hardness. Rockwell hardness test
results are used as indications of the formability of sheet material and to express tempers (see ASTM E18, Standard
Method of Test for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials). Rockwell Hardness
Test Forcing a cone-shaped diamond or carbide ball into the specimen being tested under standard pressure. The depth
of penetration is an indication of the Rockwell Hardness.
Rockwell Hardness Number - The number expressed to indicate the hardness and Rockwell scale used for the Rockwell
Hardness Test.
Roll Grind - The uniform ground finish on the work rolls which is imparted to the sheet or plate during rolling.
Rolled-in Metal - An extraneous chip or particle of metal rolled into the surface of the product.
Rolled-in Scale - A defect resulting from scale being rolled into the steel surface.
Rolled-in-Dirt - This is extraneous matter rolled Into the surface of the sheet.
Rolled-in-Scale - This consists of scale partially rolled into the surface of the sheet.
Rollforming - Fabrication method in which steel (usually coil) is linearly, progressively deformed by passing through a
consecutive series of rolls to produce a predetermined profile.
Roping - A rope-like appearance in the rolling direction after the metal has undergone severe deformation. This condition
is caused by the presence of irregular grains in the rolled product before being deformed.
Rust - Corrosion caused by exposure over time to atmosphere, chemicals or other injurious elements. Usually, Hot
Rolled and Cold Rolled turn orange/red. Galvanized and Aluminized turn white to black.
S
Secondary Steel - Material that does not meet the original customer's specifications in terms of thickness, width, surface,
chemistry or physical properties. Sold at a discount compared to prime steel, secondary may be quite suitable for other
applications.
SAE - Society of Automotive Engineers
Salt Spray Test - A procedure to determine the coating longevity of steel when exposed to corrosive effects of saltwater.
Semi Killed Steel -OLD STEEL MAKING- A low carbon steel grade that is cast into molds using very carefully
measured amounts of the strong deoxidizing elements (aluminum or silicon) so that the principal steehnaklng reaction,
carbon combining with oxygen to form a gas continues as the liquid metal solidifies. The addition of the deoxidizing agent
alters the evolution of gas (CO). The amount evolved is more than would be observed in the casting of killed steel, but
significantly less than the amount evolved by a rimmed steel. The amount of deoxidizing agent used determines the amount
of gas evolved. Semi-killed sheet chemistry exhibit variable degrees of uniformity somewhat intermediate to the killed and
rimmed grades.
Scale, Mill - An iron oxide formed on the surface of hot steel, some times in the form of large sheets which fall off when
the steel is rolled.
Scale - Iron oxides which form on the surface of Hot Rolled during or subsequent to rolling. Scale can be removed by
Pickling.
Scotch Brite - A scratch pattern surface induced by brushing with textured rolls. Can often reduce or eliminate light rust.
Scratch - Scoring or indentation of varying degree in the surface. Usually caused by rollers or during handling.
Spangle - In hot-dipped galvanizing, the visual manifestation of zinc when it solidifies. Appearing like a snowflake, spangle
can be controlled in size and brightness. Regular Spangle is typically 3/8" - 3/4";. Minimum Spangle is approximately 1/8"
Extra-Smooth has no spangle as a result of surface rolling after galvanizing. Zero spangle has no spangle, as a result of
zinc pot chemistry.
Spangles - Regular Spangle, (a.k.a. bright Spangle), is produced by allowing the zinc to cool and crystallze, normally
without restriction. forming a flower like pattern on the surface about 1/2" in diameter and larger. This type of sheet is
used for ductwork, pails, garbage cans. etc. Minimized or minimum spangle is produced by restricting or retarding the
spangle growth by the use of steam, water, or air applied as the strip emerges from the molten zinc pot. The process
not only restricts the diameter of the spangle, but also reduces the profile or height of the spangle. Sheet coll produced
with this surface is usually used for painted products. Regular apatugle is not usually suitable for painting, because
if only a thin coat of paint is used the spangle might show through. Also, the high relief on regular spangle does lend itself
to a smooth painted surface. It is also usually advisable if the steel is to be painted or laminated on a continuous coating
line, to order it extra smooth, that is, skin passed or temper rolled after galvanizing.
Seam - A surface crack sometimes caused during casting or hot-rolling.
Segregation - A nonuniformity in chemical composition occurring during solidification. Often associated with internal
defects, i.e., lamination and piping.
Special Killed Steel -OLD STEEL MAKING- This is generally a low carton aluminum killed steel, although the producer
sometimes uses other deoxidizers to obtain the desired characteristics. Special killed steel is intended for applications
where cold rolled carbon sheet is to be essentially free from significant changes in mechanical properties over a period of
time. This product is normally supplied to be essentially free from surface disturbances, such as stretcher strains or
fluting, without roller leveling. Special killed steel can be used for hot rolled carbon sheet steel when it is to be cold
reduced by the purchaser and properly processed to have the characteristics described above.
Stain, Oil - Surface discoloration which may vary from dark brown to white and is produced during thermal treatment by
incomplete evaporation and/or oxidation of the surface by the lubricants. Stainless Steel - Strip steels with high chrome
content to impede corrosion.
Sheet - A rolled product rectangular in cross section and form of thickness 0.006 through 0,249 inch with sheared, silt or
sawed edges.
Sheet - Flat-rolled steel generally less than .250" in thickness and wider than 12". The formula to calculate steel sheet
weight is: thickness (in.) x width (in.) x length (in.) x density (.2833 lb./cubic inch).
Sidewall (SW) - The contour of a coil's sides and edges. Ideally, they are free of damage, smooth and straight.
Stretcher Leveling - A method of developing superior flatness in a steel sheet by gripping the ends of the sheets with
especially designed grippers and pulling it mechanically just beyond its yield point. More commonly termed Tension
Leveling , a method of developing superior flatness in a steel coil by passing it through equipment designed to pull the
strip, while it is in motion, just beyond its yield point.
Silicon - A deoxidizing element in steelmaking; very slight tendency to segregate; generally detrimental to surface quality.
Chemical symbol Si.
Streak, Dirt - Surface discoloration which may vary from grey to black, is parallel to the direction of rolling, and contains
rolled in foreign debris. It is usually extraneous material from an overhead location that drops onto the rolling surface and
is shallow enough to be removed by etching or buffing.
Streak, Roll - A non-uniform surface appearance parallel to the rolling direction. It is caused by an uneven wiping action
on the upper backup roll(s) of a mill which transfers first to the work roll and then to the rolled product.
Skin Lamination - Seam or inclusion at surface resembling a blister. Could lead to metal fracture.
Skin Lamination - This is a sub-surface separation which usually results in a surface rupture.
Skip - An area of uncoated sheet which is frequently caused by equipment malfunction.
Stretcher Strains - These are vein-like surface defects which may appear in low carbon steel during cold deformation.
They are associated with the irregular movememt of the metal when it is being strained at the yield point Stretcher
strains are also known as "Luder's lines", "strain figures", etc.
Slab - A semifinished steel block having an oblong cross-section in which width is at least twice thickness. It differs from
a bloom which has a square or nearly square, cross-section.
Slab - A semi-finished steel block having an oblong cross-section in which width is at least twice thickness. It differs from
a bloom which has a square or nearly square, cross-section.
Slab - The primary steel shape from which coils are then rolled.
Slit Edge - An edge produced from slitting; typically tighter width tolerances than mill edge or cut edge.
Slitting - Close tolerance rotary cutting of flat rolled products. This is a continuous cutting of a sheet or coil into narrower
widths. The longitudinal splitting of the overall width of a flat product through rotary knives mounted on a rotating arbor to
reduce the original width or to cut two or more separate strips.
Sliver - Thin fragments of steel which are part of the material but only partially attached. Typically caused by surface
damage or internal inclusions which are subsequently rolled. They are somewhat similar in appearance to skin
laminations but usually more prominent.
Structural Steel (SS) - A steel quality specified when the minimum finished part strength (usually in load-bearing
applications) is required. Commonly specified in minimum yield strength (i.e., 33000 psi, 40000 psi, 50000 psi, or 80000
psi).
Smudge - A dark film of debris, sometimes covering large areas, deposited on the sheet during rolling.
Snaking - A series of reversing lateral bows in coil products. This condition is caused by a weaving action during an
unwinding or rewinding operation.
Structural Quality (SQ) - When mechanical property values other than bend tests, such as tensile or yield point
elongation, Rockwell hardness or similar tests are specified or required. This quality is also identified as physical quality,
and the term structural (physical) quality is now in use.
Special Killed Steel (Drawing Quality-DDS) - A sheet with maximum uniformity used for severe drawing or forming
operations. Has maximum ductility plus freedom from age hardening and fluting. Conforms to ASTM A620 now ASTM
A1008.
Special Killed -OLD STEEL MAKING- Steel with improve grain structure and prolong ductility through the addition of
aluminum and/or silicon and the removal of oxygen and nitrogen.
Spelter - Referring to Galvanized or Aluminized, a severe coating buildup resulting in a non-uniform surface. Spooled Coil
- A coil having edges that are turned up or down (like a spool of thread).
SQ - Designation for Structural Quality.
Stamping - Metalworking operation involving the cutting and forming of steel using tooling and dies.
Starvation - Non-uniform coating application which results in absence of coating in certain areas. This condition can be
caused by mismatch of applicator roll and sheet surface velocities.
Sticker Breaks - These are arc-shaped types of coil breaks usually located near the middle of the sheet.
Strain - The amount of elongation or compression when steel is subjected to a specific load.
Streak, Coating - A banded condition caused by non-uniform coating during the initial application process.
Streak, Grinding - A streak with a helical pattern appearance transferred to rolled products from the work rolls.
Streak, Leveler - A streak on the sheet surface in the rolling direction caused by transfer from the leveler rolls.
Stress - The force per unit area caused by externally produced forces.
Stretcher Leveled - Flatness exceeding commercial tolerances, often specified for panels or similar applications.
Stretcher Leveling - A method of producing unusual flatness in steel sheets by stretching them in a hydraulic device (see
Tension Leveling).
Stretcher Strains - Irregular lines that develop during drawing or stretching. Also called fluting.
Striation - A coating flow defect appearing as near-parallel lines.
Strip Steel - Flat rolled steel produced to precise thickness and/or narrow width tolerances.
Structural Quality (SS) - When mechanical property values other than bend tests, such as tensile or yield point elongation,
Rockwell hardness or similar tests are specified or required.
Substrate - The base metal for coated steel products can be either hot rolled, P&O, cold rolled steel, or high strength low
alloy.
Sulfur - A chemical element that tends to lower ductility and weldability; prone to foster segregation; impairs surface
quality. Chemical symbol S.
Suppressed Spangle - A spangle pattern somewhat like regular (minimized) spangle finish, except the spangles do not
exhibit as much surface relief. This finish is often desired for prepalnted galvanized sheet.
Surface Tear - Minute surface cracks on rolled products which can be caused by caster cracks.
T
Telescoping - Lateral stacking, primarily in one direction, of wraps in a coil so that the sidewall of the coil is conical rather
than flat. Usually caused by improper alignment of rolls over which the steel passes before rewinding.
Tandem Mill - A progressive series of rolling mill stations in which coils are cold-worked, primarily to reduce thickness
and improve flatness.
Temper - A condition produced in sheet steel by mechanical, chemical or thermal treatment. A given steel may be in the
fully softened of annealed temper, or it may be cold worked to the hard temper, or further to spring temper. Intermediate
tempers produced by cold working (rolling) are called "quarter-hard", "half-hard", and "three-quarters hard", and are
determined by the amount of cold reduction.
Tension Leveling - This term denotes a mechanical operation wherein sheet steel in coil form is passed through a unit
which stretches the product beyond its yield point. This is a process for improving flatness in coils by pulling in
tensions. The purpose is to provide a sheet with superior flatness characteristics. The stretch unit may be a separate
operation or in tandem with another processing unit such as a galvanizing line.
Temper - Refers to steel hardness resulting from mechanical, chemical and/or thermal properties. Generally produced by
cold-reduction, typical classifications are soft, quarter-hard, half-hard, three-quarter hard, and full hard.
Temper Passing (skin rolling) – Bands and annealed cold rolled are especially susceptible to wave, center buckle,
crossbreaks and minor surface defects. A slight cold reduction corrects these problems. Temper rolling can vary from
0.05 to 3.0%.
Temper, Leveling - A flexing of a sheet by passing through a series of rolls, to improve flatness. Usually reduces or
eliminates crossbreaks, center buckle.
Tensile Strength - The maximum tensile stress which a material is capable of sustaining. Tensile strength is calculated from
the maximum load during the tension test carried to rupture and the original cross sectional area of the specimen.
Tension Leveled - Flat rolled product that has been passed through rollers which stretch the material beyond its yield
point, producing improved flatness.
Terne - See Long Terne Metal
Triple Spot test - A process for measuring the coating weights, representing the average weight from three samples taken
across a coil/sheet width. This test is the reason Kieh Co. was started. Take the test pieces 2" from an edge - at the
centerline - 2" from the other edge.
Theoretical Weight - Sheet and strip products, sold at the theoretical weight calculated on the basis of the minimum
specified, thickness, width and length.
T Bend - A mechanical procedure in which a steel sheet is bent 180 degrees with the inside bend diameter expressed in
terms of the material thickness. A bend of 1T is equivalent to the material thickness; a 2T bend equals twice the material
thickness.
Theoretical Weight - Sheet and strip products, sold at the theoretical weight calculated on the basis of the minimum
specified thickness, width and length.
Tin - Chemical symbol Sn.
Tin-Plate - Very light gauge Cold Rolled with electrolytically-deposited tin on both sides. Used for the manufacture of
cans.
Titanium - Often used in high-strength low-alloy steels for increased yield and tensile strengths. Also used in EDDS steels
to increase ductility. Chemical symbol Ti.
Tolerance - Permissible variation in dimensions (thickness, width, length, diagonal).
Tolerance - The allowed range of deviation from a specified dimension of specified chemical element.
Ton - A unit of weight measurement. A net ton is 2,000 pounds. A metric ton is 2,204.6 pounds. A gross (or long) ton is
2,240 pounds.
Transit Rust - Oxidation occurring during shipment. Typically appears most prominently on ID and OD wraps, top and
bottom sheets, and at edges. It may manifest in sporadic spots within coil or sheet bundle.
Transition Coil - A coil that is partially Electrogalvanized coated and partially bare Cold Rolled.
Transverse - Perpendicular to the direction of rolling. Traverse Winding (a.k.a. oscillate) - Coils that are wound like a
fishing reel. In contrast to ribbon winding.
T.M.W. - Theoretical Minimum Weight (See Theoretical Weight)
U
U - As a coating designator ... designates unexposed part.
Ultimate Strength - See tensile strength.
Ultimate Tensile Strength - The maximum stress which a material is capable of sustaining in tension under a gradual and
uniformly applied load.
V
Vacuum Degassing - An advanced steelmaking process that removes oxygen and nitrogen. It is used to produce very
pure ultra-low carbon steels with high drawing and formability features, especially for automotive body applications.
Vacuum Degassing - A method to remove oxygen, hydrogen, and nitrogen from steel. The removal of these elements
occurs under very low pressures (vacuum). Developed due to continuous casting operations.
Vanadium - Often used in high-strength low-alloy steels for increased yield and tensile strengths. Chemical symbol V.
Vitrenamel Sheet - Cold rolled sheet that has been especially processed for porcelain enameling operations.
Vitreous Enameling Iron - A type of Cold Rolled sheet produced for porcelain enameling. Has very low carbon levels
and a rough matte finish (typically 55+ microinches).
Void - An internal cavity produced during the solidification process during casting.
W
Water Stain - Superficial oxidation of the surface with a water film, in the absence of circulating air, held between closely
adjacent metal surfaces such as between wraps of a coil or sheets of a stack. The appearance varies from
iridescent in mild cases to white, gray, or black in more severe instances.
Wave - An out of flat condition relative to the order or ASTM flatness specifications. Can occur across the width or
merely at edge(s).
Water Stain - Superficial surface oxidation due to the reaction of water films held between closely adjacent metal surfaces
such as between wraps of coll or sheets in a stack. The appearance varies from iridescent in mild cases to white, gray, or
black in more severe instances.
Weld (Coil) - Area where coils have been welded together to form a single, longer length for more efficient production.
The area near the weld is typically of poor quality in terms of strength, surface and coating adhesion.
Weld - A joining or union of steel, created by the application of very high temperatures.
Weldability - The adaptability of steel to welding, typically influenced by chemical composition, surface finish, coating
type and weight.
White Rust - On galvanized, corrosion that occurs when material is exposed to moisture and is unable to quickly dry,
often between adjacent wraps or sheets. Varies in severity and coverage area.
White Rust - See water stain.
Work Hardening - The increase in resistance to deformation as a result of cold-working, i.e., rolling, rollforming.
Wrap-Loose - A condition in a coil due to insufficient tension which creates a small void between adjacent wraps.
Wrinkling - A coating defect of small ridges or folds resembling a small prune skin.
X
X - As a coating designator...designates no coating...i.e. one-side.
Y
Yield Point - The load per unit of original cross-section area at which a marked increase in the deformation of the
specimen occurs with out increase of load. It is usually calculated from the load determined by the drop of the beam of the
testing machine or by use of dividers.
Yield Point Elongation (YPE) - Refers to a non-uniform elongation of steel and resulting susceptibility to Luders bands
(surface strain lines, resembling crossbreaks). The deformation can be measured and while there is no accepted
industry standard, generally a YPE measurement below 0.5% would suggest an absence of strain lines during/after
stamping.
Yield Strength - The stress at which steel exhibits a specified deviation from a linear proportionality between load and
elongation. For steel (and many other metals) an offset of 0.2% is the reference point. If steel is sufficiently
stretched, the length is increased. The measurement point at which the length permanently increases by 0.2% represents
the yield strength. For example, if a load is applied upon a steel sample, any 1.000" of its length becomes 1.002" after
loading to the yield strength. Yield strength is lower than tensile strength, since the steel will "give" before it fractures.
Yield - The amount of net finished product generated in relation to the initial gross amount. (Not to be confused with
Yield Point.) Yield Point Elongation
(YPE) - Refers to a non-uniform elongation of steel and resulting susceptibility to Luders bands (surface strain lines,
resembling crossbreaks). The deformation can be measured and while there is no accepted industry standard, generally a
YPE measurement below 0.5% would suggest an absence of strain lines during/after stamping.
Yield Point - The load or stress at which a marked increase in deformation (i.e., elongation or discontinuous thickness
reduction) occurs without increasing the applied load.
Yield Strength - The stress at which a material exhibits a specified deviation from proportionality of stress and strain.
0.2% offset is commonly used for metals. At this point the metal will no longer return to its original shape.
Z
Zinc Stringers - Surface blemishes peculiar to galvanized sheet steel are sometimes encountered. Among the most
common are zinc stringers, coarse coating and zinc ridges. When zinc adherence Is good and proper coating weights are
present, these surface blemishes have no harmful effect on the life of the sheet.
Zinc - A chemical element applied (either hot-dipped or electrolytically) to steel to improve corrosion resistance. There is
a direct correlation between the zinc coating weight and rate of atmospheric corrosion; the more the zinc, the slower the
corrosion. Chemical symbol Zn.
Zincrometal - Steel covered by the roll coated process with a base coat of zinc-chromium alloy, and a topcoat of a
weldable zinc-rich primer.
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