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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.
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.
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.
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.
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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.
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.
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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