Flat steel product provided with a corrosion protection coating and method of its manufacture

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Steel flat product comprises a steel substrate, such as a steel strip or sheet, and a zinc-based anti-corrosion coating containing (in wt.%) 0.25-2.5 magnesium, 0.2-3.0 aluminum, not more than 4.0 iron and up to 0.8 in total of lead, bismuth, cadmium, titanium, boron, silicon, copper, nickel, cobalt, chromium, manganese, tin and rare earth metals. The anti-corrosion coating is arranged in an intermediate layer which extends between a surface layer lying directly next to the surface of the product. An independent claim is also included for a method for the production of the steel flat product.