Glossary
A glossary of terms relating to alloys, their properties, and the processes used in metallurgy.

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All Terms in Glossary
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Term Definition
Shear StrengthThe maximum stress which the material is capable of sustaining in shear.
 
SheetA rolled rectangular section of thickness 0.006 through 0.249 inch with sheared, slit or sawed edges.
 
Solution Heat TreatingHeating an alloy at a suitable temperature for sufficient time to allow soluble constituents to enter into solid solution where they are retained in a super-saturated state after quenching.
 
SquarenessCharacteristic of having adjacent sides or planes meeting at 90 degrees.
 
StabilizingA thermal treatment to reduce internal stresses in order to promote dimensional and mechanical property stability.
 
Strain

A measure of the change in size or shape of a body under stress, referred to its original size or shape.

Tensile or compressive strain is the change, due to force, per unit of length in an original linear dimension in the direction of the force. It is usually measured as the change (in inches) per inch of length.

 
Strain HardeningModification of a metal structure by cold working resulting in an increase in strength and hardness with loss of ductility.
 
Stress RelievingThe reduction of the effects of internal residual stresses by thermal
geneities in the metal structure.
 
Tolerance

Allowable deviation from a nominal or specified dimension.

Standard Tolerance: An established tolerance for a particular class of product.

Close Tolerance: A tolerance closer than "Standard".

 Wide Tolerance: A tolerance wider than "Standard".

 
ToolA term usually referring to the dies, mandrels, etc., used in the production of extruded or drawn shapes or tube.
 
Tooling PlateA cast or rolled product of rectangular cross-section of thickness 0.250 inch or greater, and with edges either as cast, sheared or sawed, with internal stress levels controlled to achieve maximum stability for machining purposes in tool and jig applications.
 
Torn SurfaceA deep longitudinal rub mark resulting from abrasion by extrusion or drawing tools.
 
Traffic MarksAbrasions resulting from relative movement between contacting metal surfaces during transit. These abrasions are usually dark in appearance due to the presence of aluminum and aluminum oxide fines produced by the abrasive action.
 
Transverse BowCurvature across the width of sheet or foil.
 
TubeA hollow wrought product that is long in relation to its cross section which is symmetrical and is round, square, rectangular, hexagonal, octagonal, or elliptical, with sharp or rounded corners, and having uniform wall thickness except as affected by corner radii.
 
Ultimate Tensile StrengthThe maximum stress which a material is capable of sus. taming in tension under a gradual and uniformly applied load.
 
Unified Numbering System

The Unified Numbering System (UNS) is an alloy designation system widely accepted in North America. It consists of a prefix letter and five digits. A prefix of S indicates steel alloys, C for copper, brass, or bronze alloys, T for tool steels, etc. The first three digits often match older three-digit numberins systems, while the last two digits indicate more modern variations.

For more information on the Unified Numbering System see our Encyclopedia Page on this topic.

 
Water StainSuperficial surface oxidation due to the reaction of water films held between closely adjacent metal surfaces such as between wraps of coil or sheets in a stack. The appearance varies from-iridescent in mild cases to white, gray, or black in more severe instances.
 
WireA solid section long in relation to its cross-sectional dimensions, having a symmetrical cross section that is square or rectangular (excluding flattened wire) with sharp or rounded corners or edges, or is roimd, hexagonal or octagonal, and whose diameter, width, or greatest distance between parallel faces is less than an inch.
 
WorkabilityThe relative ease with which various alloys may be formed by rolling, extruding, forging, etc.
 


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