| 摘要 |
Steel composition comprises (in wt.%): C 0.6-1.0, Si 0.3-0.85, Mn 0.2-1.5, P up to 0.03, S up to 0.5, Cr 4.0-6.2, Mo 1.9-3.8, Ni below 0.9, V 1.0-2.9, W 1.8-3.4, Cu below 0.7, Co 3.8-5.8, Al below 0.045, N below 0.2, O below 0.012, remainder Fe with inevitable impurities. The material is made using a powder-metallurgical process, with thermal hardening to 64 Rockwell hardness scale C and an impact toughness of 49 J at room temperature.
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