| 摘要 |
A tool steel alloy having a unique combination of hardness and toughness is disclosed. The alloy contains, in weight percent, about: wt.% C 1.85- 2.30, Mn 0.15-1.0, Si 0.15-1.0, P 0.030 max., S 0-0.30, Cr 3.7-5.0, Ni+Cu 0. 75 max., Mo 1.0 max., Co 6-12, W 12.0-13.5, V 4.5-7.5. The balance is essential ly iron and usual impurities. The elements C, Cr, Mo, W, and V are balanced in this alloy such that -0.05 <= .DELTA.C <= -0.42 where .DELTA.C=((0.033 W) + (0.063Mo) + (0.06Cr) + (0.2V)) - C. A powder metallurgy tool steel article made from consolidated alloy powder having the aforesaid weight percent composition provides a Rockwell C hardness of at least about 69.5 when heat treated.
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