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Salt
Spray Test
A test to determine the life of
coated steel when exposed to corrosive
saltwater solution (generally 5% NaCl).
Scale
The ferrous oxide on the surfaces
of the hot bands; removed by pickling solution of hydrochloric
acid. Also a device used to weigh the coils.
Scarfing
Cutting the surface of slabs,
ordinarily by using a gas torch, to remove surface defects prior to
rolling at the Hot Mill.
Scratch or Gouge
This type of defect can be
recognized, in most cases, as to its source. If the scratch
or gouge occurs in the hot strip mill there will be an oxide which has
formed at the base of it. Scratches or gouges occurring at the
finishing end can be recognized by the bright appearance at the base
of the defect which is indicative of oxide removal after the steel has
cooled.
Seediness
Coating defects consisting of the
randomly spaced undissolved particles, usually resin particles, which
are immersed in the coating. They are raised up in the coating and
appear somewhat like fine sand sprinkled throughout the film.
Shape Control
Ability to produce material to a
given geometric flatness standard. (See Flatness)
Shape Defect
Geometric non-uniformity
of a strip, such as bent strip, coil set, center buckle, wavy edge,
etc.
Sheet Mill
The facility at Weirton Steel
which produces hot dipped galvanized products, including galvanized,
galvannealed and Galfan.
Sheet Products
1. Hot Roll (01) Uncoated, heavy
gauge, fully processed in Strip Steel, never cold reduced at Tandem
Mill. Cold Roll (02) Uncoated, heavy gauge, primarily processed in
Strip Steel, although some goes to the Tin Mill, always cold reduced
at Tandem Mill. Galvanized (05,06) "Bath"
coated with zinc, heavy gauge, primarily processed thru Strip Steel &
Sheet Mill, majority is cold reduced at Tandem Mill. Weirzin (07)
electrogalvanized Zinc coated, normally lighter gauge than galvanized,
processed through Strip Steel & Tin Mill, mostly single reduced.
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Shot Blast Roll
Finish
The surface finish (with a grit
microfinish) on the rolls in the last stand of tandem mill
or temper mill; determines the surface finish of the product where a
grit finish produced to a specified micro-inch reading is desired.
Single Reduced
Refers to temper rolling in the
tin mill. No gauge reduction occurs here. Steel sheet that is rolled
in multiple-strand reduction mills while cold, then annealed and
temper rolled to produce thin gauges for
can making. Besides reducing gauge and permitting fabrication of
lighter weight cans, cold rolling also improves the steel’s surface
and metallurgical properties.
Single Spot Test
A test of galvanized (or
any other metallic) coating weights administered by sampling the
coated steel across the width at two inches from each edge and dead
center. See Triple Spot Test.
Skid Marks
Visibly colder "stripes" on slabs
caused by contact with water-cooled skids in a pusher-type reheat
furnace. WSC now uses a walking beam reheat furnace, thereby
eliminating skid marks.
Skin Passed
Steel which has been processed
through the Skin Mill (Temper Mill).
Skin Roll
A product that has been processed
at the Skin Mill..
Slab
Slabs are the raw material for
WSC’s hot-strip mill , produced off the caster, and are 9 inches
thick, 32-48 inches wide by 220-398 inches long.
Slag
1.
A
waste product in ironmaking and steelmaking. Limestone, acting as a
flux, combines with impurities to form slag. Usually slags consist of
combinations of acid oxides with basic oxides and neutral oxides are
added to aid fusibility. 2. Molten remnants of the coal
burning process.
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