| 摘要 |
The steel comprises 0.17-0.30 wt.% of C, 0.15-0.50 % by weight of Si, 1.2-1.90 wt.% of Mn, not more than 0.030 wt.% of P, not more than 0.030 wt.% of S, not more than 0.30 wt.% of Cu, 0.10-1.0 % by weight of Ni, 0.5-1.30 wt.% of Cr, 0.15-0.70 wt.% of Mo, 0.04-0.10 % by weight of V or 0.02-0.1 wt.% of Nb, and 0.02-0.06 wt.% of Al.
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