化学成分：
C0.26-0.33；Si0.17-0.37；Mn0.3-0.6；P/S≤0.025；Cr0.6-0.9；Ni2-2.5；Mo0.2-0.3;V0.15-
C0.26-0.33；Si0.17-0.37；Mn0.3-0.6；P/S≤0.025；Cr0.6-0.9；Ni2-2.5；Mo0.2-0.3;V0.15-
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