Steel, for hot forming or quenching in a tool, having improved ductility

摘要

The invention relates to a steel part, the composition of the steel of which comprises, the contents being expressed by weight: 0.040%≰C≰0.100%; 0.80%≰Mn≰2.00%; Si≰0.30%; S≰0.005%; P≰0.030%; 0.010% S≰Al≰0.070%; 0.015%≰Nb≰0.100%; 0.030% Ti≰0.080%; N≰0.009%; Cu≰0.100%; Ni≰0.100%; Cr≰0.100%; Mo≰0.100%; and Ca≰0.006%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel consisting of at least 75% equiaxed ferrite, martensite in an amount not less than 5% but not exceeding 20%, and bainite in an amount not exceeding 10%.