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HARDENED MARTENSITIC STEEL HAVING A LOW OR ZERO CONTENT OF COBALT, PROCESS FOR MANUFACTURING A PART

2025-06-18 03:332250下载
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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 ppm Ni=11-16% with Ni≧7+3.5 Al Si=trace levels-1.0% Mn=trace levels-2.0% Ca=trace levels-20 ppm rare earths=trace levels-100 ppm if N≰10 ppm, Ti+Zr/2=trace levels-100 ppm with Ti+Zr/2≰10 N if 10 ppm
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