Hardened martensitic steel having a low or zero content of cobalt, method for producing a component from this steel, and component obtained in this manner

摘要

Steel, characterized in that the composition thereof is, in percentages by weight:
C=0.20-0.30%Co=trace levels-1%Cr=2-5%Al=1-2%Mo+W/2=1-4%V=trace levels-0.3%Nb=trace levels-0.1%B=trace levels-30 ppmNi=11-16% with Ni≧7+3.5 AlSi=trace levels-1.0%Mn=trace levels-2.0%Ca=trace levels-20 ppmrare earths=trace levels-100 ppmif N≦10 ppm, Ti+Zr/2=trace levels-100 ppm with Ti+Zr/2≦10 Nif 10 ppm
the remainder being iron and inevitable impurities resulting from the production operation.
;Method of producing a component from this steel and a component obtained in this manner.

主权项

1. Method for producing a component from steel, wherein the steel comprises the following steps prior to the finishing of the component which confers the definitive shape thereon:
the preparation of a steel having a composition, in percentages by weight: C=0.20 to 0.30% Co=trace levels to 1% Cr=2 to 5% Al=1 to 2% Mo+W/2=1 to 4% V=trace levels to 0.3% Nb=trace levels to 0.1% B=trace levels to 30 ppm Ni=11 to 16% Si=trace levels to 1.0% Mn=trace levels to 2.0% Ca=trace levels to 20 ppm rare earths=trace levels to 100 ppm, if N≦10 ppm, Ti+Zr/2=trace levels to 100 ppm with Ti+Zr/2≦10×N if 10 ppm