Patent ID: 7832242
Filing Date: 2010-11-16
Classification: C21D,C25D,Y10T

Abstract:
1. A method for producing a hardened profiled structural part from a hardenable steel alloy, wherein the hardened profiled structural part has cathodic corrosion protection, comprising: applying a coating to a sheet made of a hardenable steel alloy, wherein the coating comprises zinc, and the coating further comprises one or several elements with affinity to oxygen in a total amount of 0.1 weight-% to 15 weight-% in relation to the total coating; subsequently roller-profiling the coated sheet steel in a profiling device, so that the sheet tape is formed into a roller-formed profiled strand; thereafter heating the coated sheet steel, at least in part and with the admission of atmospheric oxygen, to a temperature required for hardening, and heating the coated sheet steel to a structural change required for hardening; wherein a skin made of an oxide of the element(s) with affinity to oxygen is formed on the surface of the coating thus imparting cathodic corrosion protection; and after sufficient heating, cooling the sheet, wherein the rate of cooling is set in such a way that hardening of the sheet alloy is achieved.