Patent ID: 6635313
Filing Date: 2003-10-21
Classification: B32B,C22C,C23C,Y10S,Y10T

Abstract:
In a method of coating low and ultra low carbon cold rolled steels material with zinc by first heating a fully hard cold worked steel material in a galvanizing line multi-zone reducing atmosphere furnace having a furnace temperature controlled between 760 and 820Â° C., and then dipping the heated steel material in a zinc-containing molten bath to produce a zinc coated steel product, the improvement comprising maintaining the same reducing atmosphere furnace conditions but using a high strength dual phase steel composition as the fully hard cold worked steel, the composition consisting essentially of, in weight percent,carbon between about 0.05 and 0.12%; manganese between about 1.0 and 1.6%; phosphorus up to 0.04%; sulfur up to 0.02% silicon up to 0.10%; molybdenum between about 0.15 and 0.35%; aluminum between about 0.01 and 0.08%; and the balance being iron and incidental impurities.