Steel Industry Glossary
O
OD
Outside diameter (of a coil).
Off Gauge
A defect referring to a variation of offset of the thickness of the plate from the designated aim gauge thickness and tolerance.
Offsetting
A coating defect consisting of a transference of smearing of ink or coating or other substance from the surface of one sheet of coated substrate to the back of the next sheet in a stack.
Oil Film Weight
Measure of the amount of oil applied to a flat rolled steel product; for Tin Mill Products, the measure is grams/base box; for Sheet Products, the measure is oz./sq.ft. (or gm./sq.m.).
Oiled
A product to which oil has been applied to retard rusting.
Oiling
The application of a surface layer of lubricant intended to retard rusting on sheet products and lubrication on Tin Mill products.
Olsen (Tester)
A device used to indicate the draw quality of the steel and to detect breakage caused by contamination or peeling of the zinc coating.
Open Line
Usually a steel-making defect, an open line refers to a line down the length of the strip caused by unknown conditions.
Ore
An iron bearing material used primarily in the blast furnace.
Organosol
Organosols contain poly-vinyl chloride (PVC) dispersed in solvents. At temperatures of 325-350° F (165-175° Centegrade) the vinyl particles coalesce and dissolve in the plasticizers to form homogeneous films with good hardness, toughness and adhesion.
Overpickled
Reject caused by the strip laying in acid for a period of time.
Overwidth
Product whose width is above the customer’s finished width tolerance.
Oxidation
Rust, corrosion. See Red Rust and White Rust.
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