| 简介 |
The present invention concerns a flat steel product and a method for its production, which is formed from a steel substrate, such as strip or sheet steel, and a zinc-based corrosion protection coating, applied to at least one side of the steel substrate, which contains (in wt.%) Mg : 0.25 to 2.5%, Al : 0.2 to 3.0%, Fe : <= 4.0%, and optionally in total up to 0.8% of one or more elements of the group Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn and rare earths, remainder zinc and unavoidable impurities, wherein the corrosion protection coating has an Al content of maximum 0.5 wt.% in an intermediate layer extending between a surface layer directly adjacent to the surface of the flat steel product and a border layer adjacent to the steel substrate and with a thickness amounting to at least 20% of the total thickness of the corrosion protection coating. The flat steel product according to the invention has an optimum combination of high corrosion resistance and optimum weldability, and is suitable in particular for use as a material for car body construction, for general building purposes or for domestic appliance construction. |
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