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R Enamel
An unpigmented enamel used to increase
resistance to corrosion,
or decrease bleaching effect of tinplate on food can interiors.
Red Rust
A reddish brittle coating of iron oxide which
develops on an uncoated
or
coated steel surface when oxygen in the atmosphere mixes with iron.
Reel Breaks
Fractured base metal normally
caused by poor leveling. It is indicated by light kinks across the
width of the winding coil.
Reflowed
Surface
A shiny tin plate product surface which is
achieved by heating the tin coating up to its melting point (thereby
melting the tin) and cooling it back to room temperature.
Ribbing
A coating defect consisting of a flow mark
defect with an appearance similar to corduroy
fabric. Ribbing usually occurs when the flow marks (ribs), from
application on the coater, do not flow out and level the surface of
the coating.
Ridge
A hump across the width of the surface of the
coil.
Rockwell
(Hardness Tester)
A device used to determine the hardness of
the steel strip. "Rockwell" machines are used to measure hardness of
all WSC’s products.
Rockwell
Hardness
Measure of resistance to penetration when
material is exposed to a pointed load. The hardness numbers obtained
by a Rockwell machine are related to the depth of the impression
measured after the load is applied. |
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Roll Scale
Oxide of
iron which forms on the surface of steel while it is being
heated and rolled. Much of the scale is cracked and loosened during
the rolling operation and may fall off the piece naturally or be
blown off by high-pressure water sprays or
other means.
Roll Forming
1. An operation used in forming
sheet. Strips of sheet are passed between rolls of definite settings
that bend the sheet progressively into structural members of various
contours, sometimes called "molded sections." 2. A process of
coiling sheet into open cylinders.
Roller Level
A staggered system of rolls used to flatten
the steel without any appreciable reduction in gauge.
Rolling Mill
1.
Any of the mills in which metal undergoes a
rolling process. These include the slabbing mill, hot roll mills, cold
roll mills, SR mills, and DR mills. 2. Any operating unit that
reduces gauge by application of loads through revolving cylindrical
rolls; operation can be hot or cold. Weirton Steel’s room temperature rolling mills
include Tandem Mills (Cold Mills) which are capable of reducing the
gauge of 90%, Weirlite Mills (20-45%) and the Temper Mill (1%). The
elevated temperature rolling mill is the Hot Mill and is capable of
reducing the gauge of a slab 92-99%.
Roughing Stand
The first rolling stand through which metal
passes during hot rolling. Once reduced by the roughing stands, the
metal continues on to the finishing stands where smoother rolls with a
smaller gap are used to complete the hot roll process. |
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