Common Metal terms. Common Metallurgical Terms. ABRASION RESISTANCE.
Resistance to frictional rubbing, as distinct from a resistant to knocks and impacts.
ANNEALING.
A process involving heating and cooling, applied usually to induce softening. The term is also used to cover treatment to:Remove stresses - After mechanical or physical properties - Produce a definite microstructure. Remove dissolved gases.
BEND TEST.
A test of ductility where a test piece must withstand; without fracture; bending through a specific angle around a specified diameter.
CAMBER.
The deviation of a side edge of metal sheet or strip from a straight edge.
CHALKING.
A chalk-line formation on the surface of an organic coating caused by the breakdown of the surface layer of resin, releasing pigment particles and fillers normally bound by the resin. This phenomenon normally occurs after long exposure to sunlight.
COLD ROLLING.
Is the reduction of hot-rolled pickled steel strip to a specified thickness, using a series of stands of rolls. This distorts the grain structure of the steel and also the loss of ductility.
DUCTILITY.
The ability of a metal to deform from a flat condition into a complex shape without fracture.
ELASTICITY.
That property of a material which causes it to resume its original form after removal of a load.
FINISH. FLATNESS. GALVANIZING. GLOSS.
Finish refers to the degree of smoothness of the lustre of the sheet. The flatness of sheet metal may be defined as the absence of any waviness or buckle. The process of applying a coating of zinc to a surface of iron or steel to provide a corrosion resistant surface. Zinc coating may be applied by hot dipping or by electroplating. The degree to which a painted surface possesses the property of reflecting light in a mirror like manner. COLORBOND steel surfaces are produced in a 10%, a 25% and an 80% gloss level.
HEAT TREATMENT.
An operation or combination of operations involving the heating or cooling of a metal or alloy in a solid state for the purpose of obtaining desired conditions or properties.
KILLED STEEL.
A steel with deoxidants such as aluminium or silicon added before casting molten steel to remove oxygen and so prevent evolution of carbon monoxide and chemical segregation during cooling.
LOCK SEAMS.
The closing of a tight seam of lock-formed edges of sheet metal. An example is a Pittsburgh lockseam, a grooved single lock-seam or a snap lock-seam.
LUSTRE.
Lustre finish is a smooth finish for electroplating achieved by using specially prepared rolls. Some surface preparation by the plater may be necessary.
MATT.
Cold-rolled products are available with either a matt or lustre finish. The matt finish is produced by rolling with mechanically roughened rolls. These details courtesy of the LYSAGHT Referee.
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