A ‘welded’ tube, size 1 29/32 inch O/D x 7 swg wall thickness (7swg = 0.176 inch / 4.47mm) used for scaffolding that has been Drift Tested
Scalping
Mechanical removal of oxide and contamination from surface of a cast slab prior to hot rolling.
Sealing of Anodic Coatings
A post anodising treatment to close layer porosity and reduce absorbency.
Segregation
The non uniform distribution in the microstructure of alloying elements during the solidification of an ingot, billet or slab. Some non metallic impurities may also be segregated during solidification.
Self-Quenching Alloy
An alloy whose critical quench rate from its solution treatment temperature is slower than the rate of cooling in still air. This means that the alloying elements will be held in solid solution even after cooling in still air.
Shate
A term used for rolled material where the thickness lies between that of cold rolled sheet and hot rolled plate, typically 4 to 10 mm. the finish may be hot or cold rolled.
Shear Strength
The maximum stress that a material can sustain when loaded in shear.
As a very rough guide for aluminium alloys the maximum shear strength is about 60 to 65% of the ultimate tensile strength and the yield strength in shear is 50 to 55% of the 0.2% Proof Stress.
Shear Test
A test in which the test piece is progressively loaded to fracture in shear to measure its shear strength.
Sheet
Usually defined as cold rolled flat product in the thickness range 0.25mm to 3.25mm.
Short Transverse Direction
The minor axis at right angles to the major, longitudinal, axis.
Single-Hole Die
An extrusion die with one hole, therefore capable of producing just one extrusion per cycle.