A method for producing a thermoformed and hardened steel coated with a metallic corrosion preventing coating component made of a flat steel products

摘要

The present invention relates to a process for producing a with a metallic protective coating component made of a steel coated at least 0,4 w -% mn flat steel products having. In order according to the invention in an economical manner, in the case of reduced to a minimum risk of the formation of metal induced cracks to produce a high-strength steel structural member, the invention provides the flat steel products in a continuous furnace under a to 25 vol. -% h₂, 0,1 – 10 Vol. -% nh₃, H₂O, and the remainder of n₂ as well as technically unavoidable impurities with an annealing atmosphere containing between – 50°C. and – 5°C, dew point in the case of a holding temperature of 400 – 1100°C for a hale time of 5 – 600 s to annealing. The annealed steel product has, on a 5 – 200 μm thickness of a nitride layer (n), whose grain size is smaller than the grain size of the inner core layer (k) of the highheavy-strength. After it has been covered with a metallic protective layer, is divided off the annealed steel product of a printed circuit board which, after an optional preforms to a 780 – 950°C. which is through-heated austenitizing temperature, to the steel structural member is quickly cooled hot-formed, and so that, in the flat steel products hardness structure forms.