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Fading
A coating defect consisting of the condition in a colored coating
where the color, either transparent or opaque, appears to get lighter
or bleached out. Heat, light, or chemical exposure usually causes
fading.
Feather Edge
A sharp reduction in gauge on the edge of a band which is caused be
grooves worn in rolls due to extensive rolling of the same width
material. This is done for coating control on edge. The gauge
variations on a feathered edge generally does not extend in from the
edge more than one inch.
Finishes
The texture of the steel surface which is determined by the grit on
the rolls (See Shot Blast Roll Finish) or by the grind on the rolls in
the case of bright finish (See Ground Roll Finish).
Finishing Stand
The last stand in a rolling mill, which determines the surface finish
and final gauge.
Finishing Temperature
The temperature at which hot mechanical working of metal is completed.
Fire Cracks
An irregular pattern of lines on the surface of a sheet caused by
rolling with a fire cracked roll. Fire cracks will develop when a roll
is not properly cooled.
Fish Eyes
A coating defect consisting of the undissolved particles in the
coating usually surrounded by a circular crater. The particles are
usually resinous and are raised up from the cured surface with the
appearance of the eye of a fish.
Flash Stain
A stain that occurs in the rinse tanks when the line has stopped. It
appears blue, green, or black.
Flashburn
A defect made by contact rolls when an arc is passed through the
strip. Generally on lighter baseweight. (D.R. coils)
Flashing
A coating defect consisting of the uneven, random distribution of a
coating on coated substrate. A variation in the color
of a coating which is due to variations of the Film weight. A coating
defect consisting of the flame weight fluctuation is caused by
disproportionate amount of coating transferring from the application
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Flat Coil
Coil that has collapsed center.
Flat Rolled Steel
Steel produced on rolling mills utilizing relatively smooth,
cylindrical rolls. The width to thickness ratio of flat rolled
products is usually fairly large. Examples of flat rolled steel are
hot-rolled, cold-rolled, and coated sheets and coils, tin mill
products, etc.
Flatness
The absence of any gap or clearance when a strip is placed, without
applying any pressure, between two parallel-faced plates. Wherever a
gap exists under this condition, the strip is "unflat". There are two
kinds of "unflatness"--thickness non-uniformity (such as frown,
profile, etc.) and geometric non-uniformity called shape defects such
as (wavy strip, bent strip, coil set, center buckle, etc.).
Flocculation
A coating defect consisting of the formation of clusters of particles
separable by relatively weak mechanical forces, or by a change in the
physical forces at the interface between the liquid and the dispersed
particles.
Flow Marks
A coating defect consisting of the poor flow out of the coating on the
substrate causing a ribbed (ribbing) or ridged appearance.
Fluting
1. Visible line markings that sometimes appear on the surface
of flat rolled products during forming; associated with non-uniform
yielding of the metal; occurs when the steel is formed into
cylindrical or arc shaped parts. 2. The kinking, or breaking
of a sheet generally caused by curing the sheet on two small a
diameter. Fluting, or paneling as it is often called, can be avoided
by working the steel before bending. Steel with a definite yield point
(a visible break in the stress-strain curve) will generally tend to
flute.
Footage of Coil
The length of the steel strip that makes up a coil.
Full Hard Cold Rolled
Hot rolled pickled steel that is cold reduced to a specified thickness
and subject to no further processing (not annealed or temper rolled).
The product is very stiff; it is intended for flat work where
deformation is very minimal. |
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