Patent ID: 8192560

Claim:
Method for producing a component from steel, characterized in that the method comprises the following steps prior to the finishing of the component which provides the component with its definitive shape: preparing a steel characterized in that the composition thereof is, in percentages by weight: C=0.18-0.30% Co=5-7% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=trace levels−0.3% Nb=trace levels−0.1% B=trace levels−50 ppm Ni=10.5-15% with Ni≧7+3.5 Al Si=trace levels−0.4% Mn=trace levels−0.4% Ca=trace levels−500 ppm Rare earth elements=trace levels−500 ppm Ti=trace levels−500 ppm O=trace levels−200 ppm if the steel is obtained by means of powder metallurgy, or trace levels−50 ppm if the steel is obtained by means of production in air or under vacuum from liquid metal N=trace levels−100 ppm S=trace levels−50 ppm Cu=trace levels−1% P=trace levels−200 ppm the remainder being iron and inevitable impurities resulting from the production operation; forging the steel; a softening tempering operation at 600-675° C. for from 4 to 20 hours followed by cooling in air; solution heat treating at 900-1000° C. for at least 1 hour, followed by cooling in oil or air which is sufficiently rapid to prevent the precipitation of intergranular carbides in the austenite matrix; and hardening ageing at 475-600° C. for from 5-20 h; thereby providing steel which has an Rm at ambient temperature between 2200 and 2350 MPa.