FLAT STEEL PRODUCT WITH A CORROSION PROTECTION COATING AND METHOD FOR ITS PRODUCTION

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The present invention relates to a sheet steel product and a process for producing it, which is formed by a steel substrate such as a steel strip or sheet and a zinc-based anticorrosion coating containing (in % by weight) Mg : 0.25-2.5%, Al : 0.2-3.0%, Fe <= 4.0% and, if desired, a total of up to 0.8% of one or more elements from the group consisting of ~Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn and rare earths~, balance zinc and unavoidable impurities applied to at least one side of the steel substrate, with the anticorrosion coating having, in an intermediate layer which extends between a surface layer directly adjoining the surface of the sheet steel product and a boundary layer adjoining the steel substrate and whose thickness is at least 20% of the total thickness of the anticorrosion coating, an Al content of not more than 0.5% by weight. The sheet steel product of the invention has an optimal combination of high corrosion resistance and optimized weldability and is particularly suitable for use as material for automobile body construction, for general building purposes or for construction of household appliances.