Method for producing an anti-corrosion coating for hardenable sheet steels and an anti-corrosion coating for hardenable sheet steels

A method for producing hardened sheet steel components, comprising:

• depositing at least two metal layers, one after another, onto a steel substrate, wherein the at least two metal layers act as an anti-corrosion coating and form a band composed of a quench-hardenable steel alloy;
• a first metal layer is a zinc layer or zinc-based layer and a second metal layer is a layer composed of a metal that forms baser intermetallic phases with Zn or Fe and has a higher oxidation potential than Zn, namely Ni, Cu, Co, Mn, or Mo, or a layer based on these metals;
• and the steel substrate has the following general alloy composition, respectively indicated in percentage by weight:
• carbon (C)
• 0.08-0.6
• manganese (Mn)
• 0.8-3.0
• aluminum (Al)
• 0.01-0.07
• silicon (Si)
• 0.01-0.5
• chromium (Cr)
• 0.02-0.6
• titanium (Ti)
• 0.01-0.08
• nitrogen (N)
• <0.02
• boron (B)
• 0.002-0.02
• phosphorus (P)
• <0.01
• sulfur (S)
• <0.01
• molybdenum (Mo)
• <1
• traces of iron and smelting-related impurities;
• stamping blanks from the band provided with the anti-corrosion coating;
• and either
• heating the blanks to a temperature>Ac3 and keeping the blanks at this temperature if need be, and then shaping the blanks in a press-hardening tool and quench-hardening the blanks in order to produce the sheet steel component;
• or
• cold forming the blanks into a sheet steel component and then heating the sheet steel component to a temperature>Ac3 and quench-hardening the sheet steel component in a form-hardening die.