Deformation-hardened parts made of galvanized steel, method for making the same, and deformation of parts - Method for manufacturing steel strip suitable for hardening

摘要

The present invention relates to a strain-hardened part made of galvanized steel, a method of producing a steel strip suitable for strain-hardening of the part, and a method of producing a strain-hardened part from such a steel strip. A deformed-cured part made of galvanized steel, wherein the plate is first cut from a steel sheet or steel strip coated with a zinc or zinc-based alloy, and then the plate is heated and deformed to a strain temperature of Ac3 or higher and is thus cured, At least in part, a martensitic transformation structure, wherein the steel has the following wt.% Chemical composition: C: 0.10-0.50, Si: 0.01-0.50, Mn: 0.50-2.50, P 0.02, S 0.01 , At least one of Nb, V, Ti from the group of Nb, V, Ti having a total content of iron and Nb + V + Ti in the range of 0.01 to 0.20 wt.%, N 0.01, Al: 0.015-0.100, B In which the texture of the steel after deformation-curing comprises prior austenite grains with an average grain size of 15 탆.