STEEL GUIDE - BlueScope Distribution

Common Metal terms. (Cont).
MECHANICAL Properties relating to the behaviour of materials under load in conventional mechanical tests, such
PROPERTIES. as elastic modulii, tensile strength, elongation and hardness.
NORMALIZING.
PICKLING.
PRESSING.
PRIMER.
Heating steel to; and if necessary holding at; a suitable temperature above the transformation range,
followed by cooling in an atmosphere to ambient temperature, in order to produce a medium-to-fine
pearlite microstructure.
Removal of oxide films from metal by immersion in an acid. The process is applied to scale removal
from metal prior to operations such as cold rolling, wire drawing and electroplating. Absorption of
Absorption of hydrogen may occur in pickling causing embrittlement of hard steels and necessitating
low temperature annealing for its removal.
This is a metal working process in which a flat blank; constrained between two surfaces; is forced
by a punch to take a required shape.
The first coat of a painting system applied to an unpainted surface. It has very good adhesion and
corrosion inhibitive properties.
ROLLING The direction in which strip has been rolled. Longitudinal or Transverse.
DIRECTION.
SCALE.
SKIN-PASSING.
Layers of iron oxide formed on the surface of hot steel when oxygen in the air combines with iron
form the steel.
A light cold rolling operation (about 1-2% of cold works) that removes the yield point in steel which
otherwise causes coil break, fluting or stretcher strain in subsequent operations.
SPANGLE. Grains or crystals of zinc, or zinc/aluminium as appearing on hot-dipped metallic coated steel.
STRESS Heating a metal to and holding it at some temperature, generally below recrystallization range,
RELIEVING followed by uniform cooling, for the purpose of removing internal locked stresses.
STRETCHER Stretcher levelled; as applied to sheets; indicates a standard of flatness. The term originated from an
LEVELLED early method of gripping the ends of sheets and stretching it to remove buckles.
STRIP. A continuously rolled flat product of any width and thickness, supplied rolled into a coil form.
TEMPER.
TENSILE TEST.
WASH COAT.
To modify the hardness of metals. Adjustment of hardness of heat treated articles by controlled
heating after quenching. An increase in hardness by cold rolling. The degree of cold rolling is variable
depending on the required hardness and is more than that of skin-passing.
A standard sample of material is placed between two jaws and drawn apart in a tensile testing machine
until fracture. The ultimate tensile strength is the load divided by the cross section area of the sample.
The coating applied to the back or exposed side of the painted strip. There are standard wash coat
colours for COLORBOND steel products.
YIELD POINT. The stress at which a material is permanently deformed
YIELD STRENGTH. The strength at which steel firsts exhibits plastic strain.
Common Metallurgical Terms.
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