T
Telescoping
Lateral stacking,
primarily in one direction, of wraps in a coil so that the
sidewall of the coil is conical rather than flat. Usually caused by improper alignment of
rolls over which the steel passes before rewinding.
Transit Rust
Oxidation occurring during shipment. Typically appears most prominently
on
ID and OD wraps, top and bottom sheets, and at edges. It may manifest in sporadic
spots within coil or sheet bundle.
Transition Coil
A coil that is partially Electrogalvanized coated
and partially bare Cold
Rolled.
V
Void
An internal cavity produced during the solidification process during casting.
W
Water Stain
Superficial oxidation of the surface with a water film, in the absence of
circulating air, held between closely adjacent metal surfaces
such as between wraps of
a coil or sheets of a stack. The appearance varies from iridescent in mild cases to
white, gray, or black in more severe instances.
Wave
An out-of-flat condition relative to the order or ASTM flatness specifications. Can
occur across the width or merely at edge(s).
Weld (Coil)
Area where coils have been welded together to form a single,
longer length
for more efficient production. The area near the weld is typically of poor quality in terms
of strength, surface and coating adhesion.
White Rust
On galvanized, corrosion that occurs when material
is exposed to moisture
and is unable to quickly dry, often between adjacent wraps or sheets. Varies in severity
and coverage area.
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