Importance

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Abstract

Method of hot press forming an article from zinc or zinc alloy coated steel, wherein the steel is a product obtained by:

casting the molten steel into slabs;reheating the slabs;hot rolling the steel into a strip, preferably with an FRT above Ar3;coiling the hot rolled steel strip;pickling the hot rolled steel strip;continuous annealing the strip;hot dip coating the steel strip with the zinc or zinc alloy whilst:using a dipping time of 3 seconds or more;maintaining in the hot dip bath a bath temperature of 420° C. to 500° C.;wherein the zinc bath contains essentially zinc, at least 0.1% Al, and optionally up to 5% Al and optionally up to 4% Mg, the rest of the bath including further elements all individually less than 0.3%, and unavoidable impurities;hot press forming the article.

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First Claim