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Term Definition
The difference in thickness between the middle and edges of a sheet.
Chatter Marks
A series of transverse ripples encircling a drawn product visible on outer or inner surfaces.
Chemical Properties
The properties of a material that describe its reactions with other substances, e.g. corrosion resistance.
Coating Blister
A blister in the coating of an alclad or clad product.
Coating Streak
A surface blemish on rolled material resulting from aluminum oxide transferring from the roll to the sheet surface, giving a speckled appearance; known also as "roll-coating pickup".
Cobalt is a hard, lustrous, silver-gray metal, a chemical element with symbol Co. It is found in various ores, and is used in the preparation of magnetic, wear-resistant, and high-strength alloys.
A length of a product other than a flat rolled or flat drawn product, wound into a merchantable hoop-like bundle.
Cold Shortness
The characteristic of metals that are brittle at temperatures below the recommended hot working temperature ranges.
Collapsing Pressure
The external hydrostatic or pneumatic pressure required to collapse a tube or other hollow article.
A concave departure from flat.
Conformance to a common center as, for example, the inner and other walls of round tube.
Conveyor Marks
Scratches and pits occurring on one side of a sheet as a result of contact with cables or other means of conveyance.
Copper is a chemical element in the periodic table that has the symbol Cu and atomic number 29. It is a ductile metal with excellent electrical conductivity, and finds extensive use as an electrical conductor, thermal conductor, as a building material, and as a component of various alloys.
Core Blister
A blister in the core of an alclad or clad product.
The deterioration of a metal by chemical or electro-chemical reaction with it's environment.
See: Beryllium Copper
Cupronickel is an alloy of copper, nickel and strengthening impurities, such as iron and manganese.
Die Line
A longitudinal depression or protrusion formed on the surface or drawn or extruded material due to imperfections on the die surface.
Diffusion Streak
Surface streaks on an alclad or a clad sheet resulting from alloying constituents diffusing from the core into the coating during thermal treatment.
A prefix for McDonnell Douglas's material specifications
A prefix for the Department of Defense's material specifications.
The process of pulling material through a die, to reduce the size, change the cross section or shape, or to harden the material.
Ductility is the physical property of being capable of sustaining large plastic deformations without fracture (in metals, such as being drawn into a wire). It is characterized by the material flowing under shear stress.
A characteristic of sheet to form ears when deep drawn or spun.
Deviation from a common center as, for example, the inner and outer walls of a round tube. The difference between the mean wall thickness and minimum or maximum wall thickness at any one cross section. The permissible degree of eccentricity can be expresssed by a plus and minus wall-thickness tolerance.
Electrical conductivity
Electrical conductivity or specific conductivity is a measure of a material's ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity is defined as the ratio of the current density to the electric field strength.
The percentage increase in distance between two gauge marks that results from stressing the specimen in tension to fracture.
Equivalent Round
The diameter of a circle having a circumference equal to the outside perimeter of other than round tube.
A product formed by pushing material through a die.
Extrusion Ingot
A solid or hollow cylindrical cast form suitable for extruding.
Extrusion Ingot, Drilled
A solid extrusion ingot which has been drilled to make it hollow.
Extrusion Ingot, Reamed
A hollow extrusion ingot which has been machined to remove the original inside surface.
Extrusion Ingot, Scalped
A solid or hollow extrusion ingot which has been machined to remove the original outside surface.
Extrusion Seam
A seam in tube, pipe, or hollow shapes resulting from the pressure bonding at two or more edges in the course of extruding through a spider or porthole die.
Fin Stock
Coiled sheet or foil in specific alloys, tempers and thickness ranges suitable for manufacture of fins for heat exchanger applications.
The characteristics of the surface of a product.
A rolled section rectangular in cross section of thickness less than 0.006 inch.
A metal part worked to a predetermined shape by one or more such processes as hammering, upsetting, pressing, rolling, etc.
Forging Stock
A wrought rod, bar, or other section suitable for forging.
Friction Scratches
Short longitudinal scratches introduced during coiling or reeling of sheet or foil by relative movement between adjacent wraps of the coils.
Dimension expressed in terms of a system of arbitrary reference numbers. Dimensions expressed in decimals are preferred.
Grain Flow
The directional characteristics of the metal structure after working, revealed by etching a polished section.
Grain Size
A measure of crystal size. Grain size is usually expressed as a number, with 1-5 being considered "coarse" and 5-8 being termed "fine". The higher the number, the finer the grain.
Resistance to plastic deformation, usually measured by indentation.
Hardness, Brinell
The Brinell scale characterizes the indentation hardness of materials through the scale of penetration of an indenter, loaded on a material test-piece. It is one of several definitions of hardness in materials science.
Hardness, Rockwell
The Rockwell scale is a hardness scale based on the indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload. There are different scales, which are denoted by a single letter, that use different loads or indenters. The result, which is a dimensionless number, is noted by HRX where X is the scale letter.
Heat Treatment
Heating and cooling a solid metal or alloy in such a way as to obtain desired conditions or properties. Commonly used as a shop term to denote a thermal treatment to increase strength. Heating for the sole purpose of hot working is excluded from the meaning of this definition.
Heat-Exchanger Tube
A tube for use in apparatus in which fluid inside the tube will be heated or cooled by fluid outside the tube. The term usually is not applied to coiled tubes or to tubes for use in refrigerators or radiators.
Heat-Treat Stain
A discoloration due to oxidation of the metal surface during thermal treatment.
Heat-Treatable Alloy
An alloy which may be strengthened by a suitable thermal treatment.
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