Tool steel, process for producing parts of such steel and a steel part obtained in such a manner

摘要

The invention relates to a tool steel, the composition of which comprises (the percentages being expressed in % by weight): 0.8 <= C <= 1.5 5.0 <= Cr <= 14 0.2 <= Mn <= 3 Ni <= 5 V <= 1 Nb <= 0.1 Si + Al <= 2 Cu <= 1 S <= 0.3 Ca <= 0.1 Se <= 0.1 Te <= 0.1 1.0 <= Mo + ½W <= 4 0.06 <= Ti + ½Zr <= 0.15 0.004 <= N <= 0.02 the balance of the composition consisting of iron and impurities resulting from the smelting, it being furthermore understood that: 2.5x10^-4%²<=(Ti+½Zr)xN, to a process for manufacturing parts made in this steel and to the parts obtained.