Glossary of Steel Terms

7/31/2019 Glossary of Steel Terms

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Glossary of Steel Terms

A

Aging: (also called age hardening) Changes in physical and mechanical properties that

occur when low carbon steel is stored for some time (steel becomes harder and

less ductile). Aging is accelerated by exposure of the steel to elevated temperatures.AISI:

American Iron & Steel Institute

Alloy:A partial or complete solid solution of one or more elements in a metallic matrix.

Aluminized:

cold rolled substrate with aluminum coating applied using the hot-dipped process.

Steel has excellent heat resistance and is used in burner tube applications

(furnaces), automotive mufflers and other applications were heat is a majorconsideration.

AnnealingA process involving high-temperature heating and cooling of cold rolled steel

substrate to make it softer and more formable.

ASTM:American Society for Testing and Materials. A non-profit organization which

provides a forum for producers, users, ultimate consumers, and those having

general interest (representatives of government and academia) to meet on common

ground and write standards for materials, products, systems and services. ASTMstandards are used to set the basic standards which define the requirements and

procedures governing steel products. ASTM provides a numbering system as areference point used throughout the industry (example: ASTM A653 which coverssheet steel produced by the hot-dipped galvanizing process).

B

Backer Coat:

Usually refers to the coating on the reverse side of a prepainted sheet.Bake Hardenable Steel:

Steel sheet which is aluminum killed and are resistant to room temperature age

hardening. The steel offers good formability. During the forming operation the steel

gains yield strength and offers greater resistance to dents or dings. This steel isprimarily used in automotive exposed applications.

Band:

The basic form of hot rolled coil prior to undergoing skin-passing or other postprimary rolling operations. Hot rolled coil commonly referred to as hot bands.

Base Steel Thickness:

The thickness of sheet steel without any coatings.Basic Oxygen Furnace (BOF):


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a facility to produce steel by the metallurgical process of oxygen injection into a

mixture of molten iron and scrap. Associated with the BOF are iron and steel

desulfurization, argon stirring, alloy trimming, steel reheating and vacuumdegassing.

Bend Radius:

The inside radius of a bent section of steel, normally indicated as a factor ofmaterial thickness or T. A 1-T bend diameter = 1/2-T bend radius.

Bend Test:

Tests used to determine steel ductility during which steel is bent either with oragainst the grain.

Black Plate:

Very light gauge cold rolled substrate which is used as feedstock for Tinplate or can

also be run through the hot-dipped galvanized process to produce ultra light gaugegalvanized steel.

Blank:

A processed steel sheet with highly restrictive width, length and diagonal

tolerances.Bonderized:

Specially pretreated hot-dipped galvanized where relatively thick or densecrystalline deposit of hydrated zinc-phosphate compounds is applied to the

galvanized surface. This is done at the end of the galvanizing line at the producing

mill. The result is a dull gray appearance which provides an excellent surface forpaint to be applied by various forms of application. Bonderized is also referred to as

Phosphatized.

Boron:

Chemical symbol B Boron is an additive to base metal during the melt processwhich is used to improve ductility and hardenability.

Burr:

The ridge left on the edge of steel after it has been slit, sheared, blanked or sawed.

C

Camber:

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 with the chemical symbol C.

Carbon Steel:

Steel containing carbon up to about 2% and only residual quantities of otherelements except those added for deoxidization, with silicon limited to 0.60% and

manganese to about 1.65%.

Center Buckle:A condition in a sheet steel where the center of the steel (in the rolling direction) is

longer than the edges and has a wave or buckle.

Chemical Treatment:


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A solution of corrosion-inhibiting chemicals applied to the surface of coated steel

sheet (such as galvanized steel). For many years chromate was the chemical of

choice. Currently non-chrome or RoHS compliant chemicals are available which donot contain chrome. When steel has been treated with chemicals to inhibit rust the

steel is referred to as Chemically Treated and is either Dry CTD - (no oil) or

Oiled CTO or CTLO - (a prelube or other oil is on the surface of the steel).Chromium:

A chemical element with the symbol Cr. Chromium is used to inhibit rust. It is also

used to harden steel. Chromium is prominent in Stainless Steel.CoilBreaks:

Creases or ridges in sheet that appear as parallel lines across the direction of rolling,

and that generally extend the full width of the sheet or strip.

Coating Thickness:The thickness of steel sheet including any metallic coatings (i.e. zinc or 55%

aluminum-zinc alloy) and paint coatings.

Coating Weight:

The thickness of the zinc and or aluminum applied to the base substrate (hot rolledor cold rolled) in Galvanized, Electro-Galvanized, Aluminized and Galvalume

sheet steel. In the United States the thickness can be measured in ounces per squarefoot or grams per square meter. Ounces are the measurement used in most

applications where automotive uses grams per square meter in their applications.

Cold Rolled Steel:Flat rolled steel products for which the final required thickness has been obtained

by rolling base hot rolled pickled substrate at room temperature. This is

accomplished by passing the steel through work rolls under tremendous pressure

which tightens thickness tolerances, improves shape and surface quality. The initialproduct coming through the work rolls is called Cold Rolled Full Hard and from

there the coils will need to be Annealed in order to become fully processed Cold

Rolled Steel.Color Standard:

A painted sheet panel with a prescribed color of paint representing the precise color

it is intended to produce in the prepainted sheet. A complete color standarddefinition will usually include painted panels representative of the limits of

acceptable deviatiion from the precise standard color as well.

Columbium:

A chemical element with the symbol Cb. Columbium is often used in high-strength,low alloy steels to increase yield and tensile strength.

Commercial Quality (CQ):

A quality of steel sheet which can simply bent or undergo moderate forming.Commercial Quality steel can be bent upon itself flat in any direction at room

temperature without fracturing. Commercial Quality of CQ is no longer used by the

majority of the steel industry. The proper term is Commercial Steel (CS).Commercial Steel (CS):

Steel intended for simple bending or moderate forming applications where the steel

can be bent upon itself flat in any direction at room temperature without fracturing.

You will see the designation CS, CS/A or CS/B within the industry.


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Continuous Casting:

ability to convert molten steel directly into slabs eliminating the traditional steps of

first producing ingots (molds) and from there producing slabs. Most (if not all) U.S.mills now continuous cast their slabs.

Conversion Coating:

Thechemical treatment film applied to the steel or metallic coated sheet prior topainting.

Copper:

Chemical element with the symbol Cu. Copper is used to help reduce atmosphericcorrosion resistance.

Corrosion:

(a.k.a. Rust) Gradual chemical or electrochemical attack on a metal by atmospheric

moisture or other agents. Corrosion causes pitting of the surface of the base metal ifallowed to continue over time.

Crown:

The contour of sheet steel where the thickness of the steel increases from the edge

of the strip to the center. A crown is needed to produce galvanized steel to helpremove excess molten zinc from the surface of the steel. Normal galvanizing lines

require a 3% thickness variance from the edge of the strip to the center.CS/B:

Commercial Steel type B which is the standard specification for mild carbon steel.

Cut Edge:Edge of a hot rolled coil or hot band which is more defined and has tighter

tolerances than a mill edge (open tolerances) coil. The process removes the hot

mill edge. Coil ends will be cropped back to gauge when steel is ordered with a cut

edge.cwt:

Hundred weight or 100 pounds. Standard method of referencing pricing in the

United States. There are 20 hundred weights in one short ton and 22.0462 in ametric ton.

D

Debur:

Process where the sharp edges (or Burr) are removed or reduced from the edge of aslit or cut edge of sheet steel.

Deep Drawing Steel (DDS):

The process of forming steel using dies in a press where flat steel is formed into cup

shapes or cup-like characteristics. Deep Drawn Steels are usually vacuum-degassedkilled steels with high ductility. An example of a deep-drawn part is an oil filter.

Density:

The mass per unit volume of a substance. The mass of carbon steel is .2833 poundsper cubic inch or 40.8 pounds for 1 thickness X 12 X 12. These unit

measurements are important to use when calculating steel coil or sheet weights in

the absence of a certified scale.Drawing:


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The shaping of a flat blank into a desired contour by causing the metal to flow over

a draw ring and around a punch.

Drawing Quality (DQ):Terminology no longer used by the majority of the steel industry see Drawing

Steel (DS).

Drawing Steel (DS):For applications were greater formability is needed which cannot be achieved by

Forming Steel (FS). Drawing Steels have a higher degree of ductility and are more

consistent performers than Forming Steel (FS) or Commercial Steel (CS) due tohigher standards in the production, selection and melting of the base substrate.

Ductility:

The ability to permit change of shape without fracture. In flat rolled steel, ductility

is usually measured by hardness or mechanical properties using a tensile test.Dry Film Thickness:

The thickness of the dry paint film on the surface of the steel.

E

Edging:The process of accomplishing a particular shape to the edge of a strip or slit edge

(i.e. round or square edge).

Elasticity:The ability of sheet steel to return to its original shape and dimensions.

Electro galvanized:

Sheet steel which has a thin coating of zinc applied to the surface of the steel usingan electric current and a electrolyte solution in a plating cell. Consumable zinc

anodes are positioned close to the steel in the plating cells to maintain the required

zinc content of the plating solution. Electro galvanized is used in some automotiveapplications to help inhibit rust and provide a superior product than bare cold rolledsubstrate.

Elongation:

A measurement of ductility/formability expressed by the increase by percentage(%) of a given distance (usually 2) prior to a fracture occurring during a tensile

test.

Embossed Sheet:

A sheet having a prominent, impressed texture or pattern on its surface(s). If the

defined texture is applied to one surface only, it is most properly termed a coined

surface.Extra Smooth (XS):

A more uniform appear or finish imparted to galvanized or Galvalume steel by

temper rolling (crushing the spangle through the use of works rolls undertremendous force) after the substrate has been coated. Temper rolling also imparts

resistance to stretcher strain. Most extra smooth is for prepaint applications where

surface appearance is critical.


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F

Ferrous Scrap:

Iron-containing used steel which is remelted and recast into new steel by both fullyintegrated mills (approximately 25% mix of scrap) and mini-mills (as much

as100% mix of scrap).Finish Coat:The top coat or exposed prime side paint film.

Flatness:

A measurement of a cut length sheets ability to conform to a flat horizontal

surface. The deviation is measured from the horizontal surface to the peak (orhighest point) of the sheet which is not resting on the horizontal surface. For more

information also see I-Units.

Fluting:Visible line markings that sometimes appear on the surface of flat rolled steel

during forming; associated with non-uniform yielding of the metal; occurs when

steel is formed into cylindrical or arc shaped parts. Fluting (creases in the formedsteel) can be avoided by working the steel (temper rolling) before bending.

Forming Steel (FS):

Softer or more ductile than Commercial Steel. Forming Steel was formerly called

Lock-Forming Quality Steel (LFQ) although most domestic and foreign millsproduce their Commercial Steels so they can go through a lock seam application.

Fracture:

A break in the steel at the surface which can be seen either with the naked eye orunder a microscope. Most fractures occur when sheet steel is bent or formed in

some fashion.

Full Hard (FH):

Sheet steel rolled without subsequent annealing. Generally Rockwell readings arehigher than Rb80 with elevated Yield and Tensile strengths and very low

elongation. Full Hard Cold Rolled steels (FHCR) are generally the base substrateused in hot-dipped galvanizing lines where the substrate is annealed in-line just

prior to the zinc application process.

G

Gage:

See gauge.Galvalume (GLM):

Sheet steel is coated with aluminum-zinc alloy using the continuous hot-dippedprocess similar to the process used to make galvanized steel. The nominal coatingcomposition is 55% aluminum and 45% zinc. Galvalume has superior corrosion

resistance which is achieved by the intricate microscopic formation of zinc-rich and

aluminum-rich zones within the coating. The aluminum provides long-termdurability and zinc the corrosion protection. Galvalume is a registered trademark of

BIEC International and you will find it under other names when produced by non-

BIEC production facilities.


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Galvanized (GI or GALV):

Carbon steel substrate either Cold Rolled or Hot Rolled Pickled (normally dry)

which has zinc applied to both sides. The zinc is applied as the substrate passesthrough a molten zinc bath and then is quickly dried. The process results in a layer

of zinc tightly adhering to the base steel through an iron-zinc bonding layer. Zinc is

applied to the steel for applications where corrosion resistance is important.Galvannealed (GN or GA):

Carbon steel substrate which goes through the hot-dipped galvanized process.

Immediately after exiting the molten zinc bath the strip enters a heat zone(Galvannealed rig) which converts the entire coating to a zinc-alloy layer.

Galvannealed is usually gray in color and the surface is exceptional for post-paint

applications (Chrysler and a number of foreign car manufacturers use it for the

automotive skins).Gauge:

A numbering system used to determine thickness and allowable range of flat rolled

steel products. Most mills and large manufacturers no longer use gauge but prefer

to specify the exact thickness required either by Minimum (min.) which has a -0plus thickness tolerances or, Nominal (Nom.) which have plus/minus thickness

tolerances.Gloss:

The property of a surface related to its ability to reflect light.

Gross Ton (GT):measure of mass (weight). One Gross Ton weighs 2,240 pounds. We find scrap

prices are based on gross tons.

H

Hardness:Resistance of steel to surface penetration as measured by a Rockwell hardnesstester. U.S. customers are used to seeing the surface hardness measured on the b

scale as in Rb 65 max for commercial steels.

Heat:The amount of steel produced out of a single melt at the producing mill.

Heat Number:

The reference number used by the producing mill to keep track of steel originatingfrom a specific melt. The heat number stays with the coil throughout the processing

cycle unless it is designated as secondary (distressed) steel.

High Carbon:

Steel with carbon content exceeding 0.30%. The more carbon in the steel the harderthe product and less formable it becomes. High carbon steels are used in such

products as shovels or plow blades.

High Strength Steels (HSS):sheet steel calling for higher strength levels usually customers order High

Strength Low Alloy (HSLA) in this category. High Strength Low Alloy (HSLA)

sheet steel which has higher strength through the addition of alloying elements suchas Columbium, Vanadium and Titanium used alone or in combination.


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Hot-Briquetted Iron (HBI):

Direct reduced iron which has been processed into a compact brick-shaped mass or

briquette. Instead of using a blast furnace the oxygen is removed from the ore usingnatural gas which results in a substance which is 90-92% iron.

Hot End (of a mill):

The section of the mill between the furnace and up to the Hot Roll Mill.Hot Metal:

name for the molten iron produces in a blast furnace. From there it proceeds to the

Basic Oxygen Furnace (BOF) or is cast as Pig Iron.Hot Rolled Steel (HR or HRS):

Flat rolled steel produced from slab which is put through the mill work rolls to

determine the final thickness while at high temperatures.

Hot Strip Mill:a rolling mill which has several stands of rolls that convert slabs to hot rolled coils.

The rolls squeeze red-hot slabs thus reducing the thickness at the same time

governing the width through the use of horizontal rolls. A hot mill can convert a

slab which is up to 10 inches thick down to .250 with a length close to a quartermile long.

Hydroforming:the process of taking a tube and putting it into a forming die. The tube is then

shaped to the form of the die by using internal water pressure. This is a process

which is being used by the automotive industry for body rails, radiator supports andengine cradles.

I

I.D. (ID):

Inside Diameter of a coil. Normal IDs in North America are: 16 (using tinmill/black plate products), 20, 24and 30.Impact Testing:

Procedure to determine the resistance of steel to fracture under extreme conditions.

Inclusiions:Non-metallic materials (such as oxides, sulfides or silicates) in steel as cast.

Ingot:

Semi-finished steel product which is accomplished by pouring molten iron into amold and slowly letting it solidify. Ingots were then moved around the mill, the

molds removed at the stripper building and then reheated and rolled into slabs.

Integrated Steel Mills:

those steel making facilities which process iron ore into molten iron using blastfurnaces. The hot end (blast furnaces, BOF, etc.) is the only difference between an

Integrated Mill and a Mini-Mill. Virtually all of the Integrated Mills are involved in

the production of flat rolled steels plate, hot rolled, cold rolled, coated steels(galvanized, Galvalume, aluminized, electro-galvanized) and tin mill products.

Intercoat Adhesion:

The adherence which is observed between the primer and topcoat of a paint system.Intermediate Temper:


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Cold rolled substrate with a hardness referenced within a 15-point Rockwell range.

For example Quarter Hard Rb 60-75.

Interstitial Free (IF) Steel:Ultra-low carbon steel usually near or below 0.002 Carbon produced using

vacuum-degassing. IF steels are extremely ductile and are used primarily in

automotive applications where there is a need for extra deep drawing or specialforming. During my days representing Winner Steel (a galvanizing conversion mill

now called Duferco Farrell) the mill used IF substrate as the only way the mill

could produce DDS or EDDS product.Iron:

Chemical symbol Fe the largest part of carbon steel representing approximately

94.5% in the pure molten state.

Iron Carbide:One of the substitutes used in place of scrap for use in electric arch furnaces (EAFs

for Mini-Mills). Iron carbide producers use natural gas to reduce iron ore to iron

carbide.

Institute for Supply Management (ISM):Organization of purchasing managers they conduct a once per month poll of their

membership which results in the ISM Purchasing Managers Manufacturing Indexwhich is released on the 1st business day of each month and is a key economic

indicator for those involved in the steel business.

J

Jet Cooler:Devices that controls the cooling of the steel strip before it enters the galvanizing

pot.

Jib:Projecting part of crane from which lifting chain or gear is suspended.Jumbo Coil:

A single coil produced by welding two or more coils together.

K

Killed Steel:Steel deoxidized by silicon or aluminum to reduce the oxygen content in molten

steel to a minimum prior to solidification of the metal. Killed Steels have more

uniform properties and chemical composition than other types of steels.

L

Ladle:

A vessel or bucket lined with refractory bricks used to transport molten steel in a

steel mill.Lead:


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Chemical symbol Pb used in molten zinc baths (pots) in a hot-dipped galvanizing

line in order to produce a large spangle. Most North America mills have removed

lead from their pots and are using Antimony as a replacement or have gonespangle free.

Lead Time:

the amount of time from the placement of an order until delivery.Leveling:

The process of removing coil set and flattening or correcting the shape of the steel

by putting the steel through a series of rolls under a tremendous amount of force.Light Gauge Steel:

Cold rolled substrate which is lighter than .018 in thickness. This has become a

very generalized term for all thin steels which would include tin plate as well as

galvanized and other coated steels under .018 in thickness.Light Matte Finish:

Cold Rolled surface which has a profilometer range of 20-40 micro-inches. The

intention is for a smooth surface for painting such as metal furniture applications.

Lockforming Quality (LFQ):An old terminology used to determine if galvanized steel could be put through a

piece of machinery called a lockformer which usually takes the steel andperforms a back-to-back 180 degree bends. The result is having the steel lock itself

together much like taking your fingers curling them and gripping both hands

together. The LFQ designation is no longer being used. Instead we use either CS/Bor FS to describe the product needed to make a lockseam application (normally

HVAC ductwork).

London Metal Exchange (LME):

the metals trading center for the Western World. The LME determines preciousmetal futures pricing for Zinc, Aluminum, Copper, etc. many of which are used in

the steelmaking process.

Long Products:Classification of steel products which includes bar, rod and other structural pieces

which are not rolled flat.

Low Carbon Steel:sheet steel substrate with a carbon content usually under 0.005%.

Lubricity Slipperiness:

The ability of steel sheet to be able to slide in a forming die.

Lders Lines:(stretcher strain) Irregular surface markings or depressions caused by localized

plastic deformation resulting from yield point elongation.

M

Manganese:Chemical symbol Mn moderately hard element used to strengthen or harden steel.

Man-Hours-Per- Ton (M-H/Ton):

The ratio of total hours worked by steelworkers to the tons shipped during a givenperiod of time.


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Matte Finish:

a gritty surface look on cold rolled steel accomplished by roughened rolls during

the cold rolling process.Mechanical Properties:

the structural qualities measured by tensile strength, elongation and yield strength

in sheet steel.Metric Ton (MT):

measure of mass (weight). One metric ton equals 2,204.62 pounds.

Micrometer:piece of hand held equipment used to measure the thickness of the steel.

Mil:

A term used to indicate thickness of 0.001".

Mild Carbon Steel:sheet steel usually with a carbon content between 0.005-0.010.

Mill Edge:

Standard edge off the hot mill with very liberal width and shape tolerances.

Minimum Spangle (MS):Very small flower (crystallization of the zinc) pattern on the surface of galvanized

steel. There are no standards for specific flower size but generally refers to barelyvisible flower to no flower pattern at all.

Mini-Mill:

Steel mills that utilize scrap steel (or scrap substitutes) to make new steel. The scrapis charged or heated by using electricity in an electric arch furnace (EAF). There

are a number of mini-mills in the United States with the best known being Nucor,

Steel Dynamics, Commercial Metals, Gerdau America, Severstal Columbus. A

number of the mini-mills produce long products as well as flat rolled sheet steel.\Molybdenum:

Chemical symbol Mo used in high-strength low-alloy grades to increase yield and

tensile strength.Months-of-Inventory:

Based on current sales the amount of time it will take to eliminate inventory current

on a companys floor.Motor Lamination/Electrical Steels:

a type of cold rolled used as electromagnetic core material for electrical equipment

(motors, transformers, etc.). AK Steel is the major U.S. producer of Motor

Lamination or Electrical Steels.

N

Niobium

Chemical symbol Nb often used in high-strength low-alloy steels for increased

yield and tensile strength.Number 1 Heavy Melt (HMS) Steel:

obsolete steel scrap grade made up of pieces at least one-quarter inch in thickness in

pieces no larger than 2 feet by 5 feet. Mini-mills are primary consumers of HMSproducts.


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O

OD (O.D.):

Outside diameter of a steel coil.Offline:

terminology used when a piece of equipment is shut down and/or not operating.Oiled:Application of prelube or other oil to the surface of steel to either inhibit rust or

assist in the lubricity of the steel as it moves through manufacturing dies.

Olsen Test:

piece of testing equipment used to measure ductility or the drawing qualities ofsheet steel.

Operating Rates:

The ratio between the raw steel production rates of a mill compared to its statedcapacity also called Capacity Utilization Rates.

Oscillating:

the practice of winding coils so that the outside walls of the coil appear to be likewaves (steel is wound in and out by moving the recoiler mandrel back and forth). In

the extreme you can get a telescoping affect which is deemed a defect. On light

gauge galvanizing lines it is used to help prevent galvanized build up on the edges

which causes a belled or wavy edge on one side of the strip.Oxidation:

the reaction between oxygen and steel over time which can cause pitting, stain and

the loss of strength.

P

Peak Earnings:The top of the business cycle when a company is able to maximize profits.

Pellets:fine particles of iron ore mixed with bonding clay and heated into round balls which

are used to feed a blast furnace. Also called Taconite Pellets.

Pencil Hardness:A physical measurement of the hardness of a paint film which is based on the

resistance of the film to cut-through by pencil leads of specified hardness. Pencil

hardness values range between 2B and 5H.

Phosphatized:Chemical treatment in a phosphate solution of metallic coated sheet to prepare the

surface for painting.Pickling:process of removing scale and rust from the surface of hot rolled steel using

hydrochloric acid baths. Usually after the Pickling process is complete the steel is

cleaned and then oiled to protect the steel from rusting quickly this is called HotRolled Pickled & Oiled (HRPO). If the steel is going to a galvanizing facility it

normally is produced dry (HRPD).

Pig Iron:


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Reflectivity (Reflectance):

A term to indicate the percentage of reflected light from a painted surface.

Refractory Brick:Heat resistant brick used to line the walls of a blast furnace, sides of the ladles and

inside a Basic Oxygen Furnace (BOF).

Reline:The process of replacing worn out refractory brick in a blast furnace, ladle or Basic

Oxygen Furnace. Relines can take 45 days to 3 months to complete and are very

expensive.Residuals:

Are the impurities left as a result of the mix of steel scrap used by a mini-mills in an

electric furnace operation. Impurities (high residuals) can leave steel too brittle for

its intended use.Reversing Mill:

A stand of reducing rolls where steel strip is passed back and forth through the rolls

reducing the thickness of the steel with each pass.

Rockwell:a test measurement to determine surface hardness. Surface hardness is measured on

a b scale. Rb 50-65 is considered normal Rockwell for commercial sheet steel.Rollforming:

Fabrication method in which coiled steel is passed through rolls which

progressively form the steel to a predetermined profile.Roughing Stand:

First stand of rolls through which hot metal passes during the hot rolling process.

Once through the first stand of rolls the metal continues on to the finishing stands

where smoother rolls reduce the coil to its final hot rolled thickness.

S

Sacrificial Barrier:

A coating, such as zinc, which sacrifices itself to the corrosive elements of the

atmosphere to protect the steel from corrosion (rusting or pitting).Salt Spray Test:

a procedure where steel sheet is exposed to the corrosive effects of salt water. The

purpose is to see how long the steel can withstand the exposure before breakingdown.

Sawing:

Cutting metal (usually plate or heavy gauge hot rolled) into customer requested

width, lengths or shapes.Scrap Steel

(see Ferrous Scrap)

Scrap Substitute:Raw materials which can be used in an Electric Arc Furnace (EAF) in place of

scrap they include pig iron, HBI, DRI and iron carbide.

Secondary Steel:


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Steel which did not meet the original customers specifications because of a defect

in chemistry, appearance or other quality imperfections. If another prime customer

cannot use the steel in its existing condition the steel is many times sold as adefective product at a reduced price into the marketplace.

Semi-Finished Steel:

For flat rolled steel this would mean slabs which can be reheated at a later time androlled into sheet products.

Service Center:

A generic name for steel distributors which buy steel from mills (domestic andforeign) and re-sell the metal into the manufacturing sector (or to other distribution

facilities). Service centers sell steel not a manufactured product.

Shape Correction:

The process of using levelers, temper mills, edge trimmers and other pieces ofequipment to reprocess steel to meet a customers specifications.

Sheet:

Flat rolled steel usually less than .250 inches in thickness and wider than 12 inches.

Sixty-five percent of the U.S. steel market is sheet steel (hot rolled, cold rolled,galvanized, Galvalume, aluminized and tin mill products).

Shredded Scrap:baseball size pieces of old automobiles after being reduced by a shredder at the

scrap yard. Magnets separate the reusable portion of the vehicle which, once

shredded, is sold to mini-mills to make new steel.Sidewall:

The contour of the sides of a steel coil. Prime mill steel sidewalls are generally

smooth and free or damage. However, in light gauge steels the sidewalls can be

intentionally oscillated to reduce the risk of buildup on the edges of the strip.Skin-Passed:

Steel which has passed through a temper mill (sometimes called extra smooth).

Slab:The beginning mass either produced by continuous casting or in an ingot mold.

Slabs are then reheated and rolled into hot bands or hot rolled coils.

Slit Edge:The edge of a coil or sheet after being fed through a highly tempered knives located

on the slitter head. The edge of slit coils has tighter tolerances than normal mill run

edges.

Slitting:The continuous cutting of a master coil into narrower width strip(s).

Society of Automotive Engineers (SAE):

Organization which develops standards for automotive-related steel products.Spangle:

The visual manifestation (which is flower like) of the zinc when it solidifies as the

sheet emerges from the pot of molten zinc in a galvanizing line. The zinc crystal orspangle varies in size, brightness and surface relief depending on a number of

factors concerning the cooling rate and pot chemistry. Lead or Antimony is added

to the molten zinc in order to obtain a larger spangle or flower pattern on the

surface of the steel.


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Spangle Free:

Suppression of the formation of spangle on the surface of galvanized steel which is

accomplished through the elimination of lead or antimony in the pot chemistry andis further enhanced by use of temper rolls if needed.

Spot Pricing/ Spot Sales

non-contract sales either by a mill or service center. Spot sales pricing floats withthe market and can change at any time. Most steel price indexes follow spot prices.

Strength Properties related to the ability of steel to oppose applied forces and

remain in its original shape.Steel Market Update (SMU):

High-quality newsletter and website dedicated to the North American flat rolled

steel industry.

Stretcher Leveled:Leveling where a sheet is gripped at each end and subjected to stress higher than its

yield strength to remove warp and distortion (i.e. result in a flatter sheet).

Strip Steel:

flat-rolled steel produced to precise thickness/width tolerances.Structural Steel (SS):

steel quality which has minimum strength requirements usually measured inminimum yield strength (such as 33,000 min yield grade 33, 40,000 min yield

grade 40, etc.).

Substrate:Base metal used in the next step in processing. Example: cold rolled (or full hard

cold rolled) is the base metal used in a galvanizing line. Hot rolled is the base metal

or substrate used to make cold rolled.

Surface Imperfections:A superficial defect that mars the surface of the steel and is detrimental to the end

use examples include blisters and roller marks.

T

T-Bend 0-, 1-, 2-, etc:A mechanical operation wherein a sheet sample is bent back upon itself with the

inside bend radius specified in terms of the sheet thicknesses. Thus a 2-T Bend is a

bend with an inside radius two times the sheet thickness of the metal sheet beingtested.

Taconite:

Natural mineral containing less than 30% iron. It is the primary ore used in blast

furnaces.Tail End:

The part of a coil that makes up the inner diameter on the entry reels and the outer

diameter on the delivery reels (the end of the master coil feeding into thegalvanizing line which then becomes the outer wraps after coating and rewinding).

Tandem Mill:

A cold-rolling mill with a series of rolls to achieve the desired thickness and surfacequality of the cold rolled steel.


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Temper Mill (Temper Rolling):

A light cold rolling operation that may be used on hot rolled, cold rolled and some

coated steels such as galvanized. Temper rolling hot rolled helps to improveflatness, minimize coil breaks and fluting by altering mechanical properties.

Temper rolling cold reduced or coated sheet improves surface finish, alters

mechanical properties and reduces the tendency for steel to flute during fabrication.Tensile Strength:

The maximum stress in uniaxial testing which a material will withstand prior to

fracture. The ultimate tension strength is calculated from the maximum load appliedduring the test divided by the original cross-sectional area.

Tension Leveling:

A mechanical operation where sheet steel is put through rolls and stretched beyond

its yield point in order to improve flatness.Tolerance:

permissible variation in steel dimensions (thickness, width, length and diagonal).

Toll Processing:

The act of third party processing (slitting, leveling, blanking, shearing, sawing, etc.)which is done for a fee.

Ton:A unit of weight measurement. A net ton or short ton is 2,000 pounds. A metric ton

is 2,204.62 pounds. A gross or long ton is 2,240 pounds.

Transverse:Perpendicular to the rolling direction.

Triple Spot Test:

A process for measuring the coating weight on coated sheet (galvanized,

Galvalume, etc.) by taking three samples one each 2 inches in from the edge andone dead center and then obtaining the average which determines the result (in

simple terms it is the way to officially decide the actual coating weight on sheet

steel).Truckload:

In the United States the weight a truck can legally carry on the road which is

approximately 44,000 pounds. Some trucks will vary depending on whether theyhave an aluminum trailer vs. steel.

U

Undercure:

In prepainted steel when the initial baking of the paint system is below that

necessary for full polymerization the result will be blocking or sticking of thecoated sheet steel.

VVacuum Degassing:An advanced steelmaking process which removes oxygen and nitrogen under low

pressure (in a vacuum) in order to produce ultra-low carbon steel for demanding

formable applications - normally performed in the ladle, the removal of dissolvedgases results in cleaner, higher-quality steel.


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Vitreous Enameling Iron:

A type of cold rolled sheet produced for porcelain enameling and has very low

carbon levels and a rough matte finish.Virgin Metal:

Steel obtained directly from ore and not used before.

Voluntary Restraint Agreements (VRAs):A compromise reached between the United States and foreign steel-exporting

nations. Instead of the U.S. imposing punitive duties on imports, the foreign

countries would voluntarily limit their steel exports to the United States. WWash Coat:

A very thin paint film applied to the back side of a prepainted sheet specified to

have one finished side. The wash coat provides protection in coiling, storage,fabricating and handling.

Wasters:

Coils which have prohibited defects which do not allow them to be resold.

Normally the material is fit for remelting only.

Wave:Out of flat condition generally introduced during the cold-rolling process. The

terminology comes from the peak and valleys on the edge of the strip giving awave appearance.

Weld:

The point at which there is a union of steel sheet created by the application of veryhigh temperatures.

White Rust:

The corrosion product (zinc hydroxide, etc.)that forms when galvanized sheet gets

wet and is unable to dry.Work Hardening:

An increase in the resistance to deformation as a result of cold-working (i.e. rollforming or similar working of the steel).

X

X-Ray Gauge:

Equipment used to measure the thickness of steel as it goes through a piece of

processing equipment like a galvanizing line or slitter. On a galvanizing line the X-Ray Gauge is used at the beginning of the line in order to cut out off thickness

substrate. It is close to the exit end of the line (after the temper mill and tensionleveler) to measure the final produced thickness of the steel.

Y

Yield:

The amount of net finished product generated in relation to the initial gross amount.

Yield Point:


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The load or stress at which a marked increase in deformation occurs (i.e. elongation

or discontinuous thickness reduction) without increasing the applied load.

Yield Point Elongation (YPE):Refers to the non-uniform elongation of steel and the resulting susceptibility to

strain lines (resembling cross-breaks). The deformation can be measured and while

there is still no accepted industry standard, generally a YPE measurement of below0.5% would suggest an absence of strain lines during or after stamping.

Yield Strength:

The stress point at which steel exhibits a specified deviation from a linearproportionality between load and elongation. For steel an offset of 0.2% is the

reference point. If steel is sufficiently stretched, the length increases. The

measurement point at which the length permanently increases by 0.2% represents

the yield strength. Yield strength is lower than tensile strength, since steel willgive before it fractures.

Z Zinc:A chemical element with the symbol Zn. Zinc is used to coat steel to improvecorrosion resistance. There is a direction correlation between the amount of zinc (or

coating weight) and the rate at which the atmosphere will break down the zinc.

More zinc less corrosion.

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Glossary of Steel Terms

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