| 摘要 |
This invention relates to a method of thermomechanical shaping a final product with very high strength comprising the steps of: providing a coated hot-rolled and/or cold-rolled steel strip or sheet comprising (all percentages in wt.%): 0.04%<carbon<0.5%, 0.5%<manganese<3.5%, silicon<1.0%, 0.01 %<chromium<1 %, titanium<0.2%, aluminium<2.0%, phosphorus<0.1 %, nitrogen < 0.015%N, sulphur<0.05%, boron<0.015%, unavoidable impurities, balance iron, the steel being coated with a zinc alloy coating layer, wherein the zinc alloy consists of 0.3-4.0 %Mg and 0.05-6.0 % Al; optionally at most 0.2 % of one or more additional elements; unavoidable impurities; the remainder being zinc; cutting the steel sheet to obtain a steel sheet blank; thermomechanical shaping of the steel sheet blank to a final product with its final properties. |
