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Terne coated sheet is cold rolled
sheet that is hot-dip coated with a lead-tin alloy of
approximately 92% lead and 8% tin. The coating, which has a
dull gray finish, is very ductile and has a lubricating
characteristic that enhances formability in drawing
operations. Terne coated sheet continues to be used today
because of its excellent corrosion performance when in contact
with petroleum fuels. The
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lead-containing terne
coating provides long-term barrier-type corrosion resistance. Recall
that barrier corrosion means simply that the liquid medium is
physically kept from contacting the steel to prevent corrosion of the
steel. In addition to being used for fuel tanks, terne coated steel
sheet has a number of specialty uses such as oil-filter shells; most are
related to terne's excellent lubricating action when manufacturing
deep-drawn parts.
U. S. Steel produces two types of terne coated sheet:
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USS Terne Sheet
1.) U. S. Steel Terne
Sheet is manufactured by processing annealed, cold rolled steel
sheet through a hot-dip coating operation to apply a lead-tin
alloy coating. It is an economical material for applications
requiring excellent ductility combined with long-term barrier-type
corrosion resistance.
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USS NI-TERNE Sheet
2.) U. S. Steel NI-TERNE
Sheet is manufactured using a similar process as that used for
terne sheet to apply a lead-tin coating. The difference in
processing is that the annealed cold-rolled steel sheet is first
processed through a section of the coating line to apply a thin
flash coating of electrodeposited nickel under the same type of
hot dip lead-tin alloy coating as U. S. Steel Terne sheet. The
nickel base coat gives U. S. Steel NI-TERNE Sheet an extra measure
of corrosion resistance which is primarily achieved by improving
the wetability between the lead-tin coating and the steel
substrate during the hot-dip coating process. Both U. S.
Steel Terne Sheet and U.S. Steel NI-TERNE Sheet are offered in an
identical range of sheet sizes, thicknesses and coating weights.
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