S
S/T
Side trimmer.
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. (Tandem)
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.
Slit Edge
The relatively smooth edge
produced from side trimming or slitting. See Mill Edge.
Slitter
1.
Area on the Pickler where
the strip is sidetrimmed (slit) to its proper width. 2. Sidetrims
the edges of the strip to certain width in the customer’s
specifications, or the vertical cutting of coil material to form narrow
strip product.
Slivers
Slivers are due to defective
teeming of the molten metal and to a tearing of corners of the steel in
blooming, roughing, or finishing. Tearing is attributed to many things,
such as overoxidation in the open hearth, or burning during reheating or
soaking.
Soldering
Joining metals by fusion of alloys
that have relatively low melting points – most commonly, lead-base or
tin-base alloys, which are the soft solders. Hard solders are alloys
that have silver, copper, or nickel bases and use of these alloys with
melting points higher than 800 degrees F is generally termed brazing.
Spalling
The cracking and flaking of metal
particles from a surface.
Spangle
Finish achieved when zinc is
allowed to "freeze" naturally on the sheet – galvanize. Achieved by
adding antimony to the hot dip bath.
Spangle Free
A galvanized product in which the
spangle formation has been suppressed; accomplished by eliminating
Antimony and Lead in the molten zinc bath during the production of Hot
Dipped Galvanized. Galvannealed is always spangle free.
Special Killed
1.
Low carbon aluminum killed
steels used mainly for extra deep drawing varieties of sheet and strip.
2. Steel deoxidized by silicon or aluminum or in combination to
reduce the oxygen content to a minimum so that no reaction occurs during
solidification of the metal.
Special Treatment
A treatment applied to Weirzin (electrogalvanized)
to enhance corrosion resistance.
Specifications
The chemical composition and
dimensions of products made by the plant. The specifications include all
processes required to achieve the finished product.
Spooled Coil
A coil having edges that are
turned up (like a spool of thread).
SR Plate
Single Reduced Plate. This product
comes from the Temper Mills and goes to the Tin Mill for processing but
does not get any further cold reduction.
SRI
See Steel Recycling Institute.
Stack Test
A full width sample of chem-treat
steel saved for metallurgical testing.
Stain
A defect on the plate causing a
discoloration of the plate.
Stainless Steel
1.
A corrosion resistant steel
containing a higher percentage of chromium, generally 10% more. 2.
By AISI definition, a steel is called "Stainless" when it contains
4% or more chromium.
Steam Blowing Process
A process that puts water droplets
on steel leaving the galvanizing pot to suppress spangle formation. See
Minimized Spangle and Spangle Free.
Steel Drum
Center insert that keeps a coil
from collapsing. Used on DR material.
Steel Insert
Small corrugated insert used to
keep coils from collapsing before rewinding.
Steel Recycling Institute
A steel industry association that
promotes and sustains the recycling of all steel products. The SRI
educates the solid waste industry, government, business and ultimately
the consumer about the benefits of steel's infinite recycling cycle.
Strain
The amount of elongation or
compression that occurs in a metal at a given stress or load. Generally
in terms of inches elongation per inch of material.
Stretcher Strains
Irregular lines that develop on
steel during the drawing or stretching process. See fluting.
Striation
A coating defect consisting of a
series of near parallel lines or channels in the cured coating.
Striation is a type of flow mark, which is caused by some contaminant,
such a silicone flowout. Striation is similar to ribbing, but striation
is usually smaller in size and not always parallel.
Strip Steel
Facility at Weirton Steel which
produces hot rolled bands, hot rolled and pickled bands, cold rolled
steels and cold rolled bands for further processing in Sheet Mill and
Tin Mill.
Strip
1.
A flat rolled steel product.
Strip is produced to more closely controlled thickness than sheet.
2. Another name for the steel that travels through the line.
Structural Quality
Material applicable to the various
classes of structures, indicated by the standard specifications, which
is suitable for the different mechanical operations employed for the
fabrication of such structures. Structural quality (the characteristics
of which are defined in the standard specifications of the American
Society for Testing Materials) represents the quality of steel produced
under regular or normal manufacturing conditions.
Sulfide Staining
A coating defect consisting of a
dark grey-black colored residue on tinplate which occurs when a break in
the coating permits a high sulfur food to contact the tinplate.
Surface Finish (Tin Mill Products)
The ground roll finishes are : 7B,
a smooth finish, normally for melted coatings intended for special
applications; 7C, the standard mill finish, for either melted or
unmelted coatings is the finish used for most applications. The blasted
roll finishes are 5B, a shot blast finish (SBF) with a melted tin
coating; 5C, a shot blast finish with an unmelted tin coating,
principally for crowns and closures; 5D, a shot blast finish with and
unmelted tin coating primarily for D&I cans.
Surface Imperfections
A superficial defect that mars the
surface of steel and is detrimental to the end use; examples include
blisters and roll mark defects.
Surface Inclusion
An inclusion or non-metallic
particles that shows through at the surface of the steel. (See also
Inclusion)
Surface Oil
Oil which is applied for corrosion
protection or other special purposes.
Surface Roughness
The texture or "pattern" of a
steel surface determined by the grit on the roll or the grind on a brite
roll.
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