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HARDENED MARTENSITIC STEEL HAVING A LOW COBALT CONTENT, PROCESS FOR MANUFACTURING A PART FROM THIS

2025-06-21 18:324620下载
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A steel characterized in that its composition is percentages by weight : C=0.18-0.30% Co=1.5-4% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=traces-0.3% Nb=traces-0.1% B=traces-30 ppm Ni=11-16% where Ni≧7+3.5 Al Si=traces-1.0% Mn=traces-2.0% Ca=traces-20 ppm Rare earths=traces-100 ppm if N≰10 ppm, Ti+Zr/2=traces-100 ppm where Ti+Zr/2≰10 N if 10 ppm
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