Dual phase steel strip suitable for galvanizing
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United States of America Patent
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Dec 25, 2007
Grant Date -
Oct 28, 2004
app pub date -
May 17, 2004
filing date -
Nov 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Dual phase steel sheet is made using a time/temperature cycle including a soak at about A.sub.C1+45.degree. F. to A.sub.C1+135.degree. F. and a hold at 850-940F, where the steel has the composition in weight percent, carbon: 0.02-0.20; aluminum: 0.010-0.150; titanium: 0.01 max; silicon: 0.5 max; phosphorous: 0.060 max; sulfur: 0.030 max; manganese: 0.8-2.40; chromium: 0.03-1.50; molybdenum: 0.03-1.50; with the provisos that the amounts of manganese, chromium and molybdenum have the relationship: (Mn+6Cr+10 Mo)=at least 3.5%. The sheet is preferably in the form of a strip suitable for coating in a continuous galvanizing or galvannealing line, and the product is predominantly ferrite and martensite. The strip may be galvanized or galvannealed at a temperature within thirty degrees F. of the temperature of the bath.
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