化学成分：
C≤0.12%
Si:0.25%~0.75%
Mn:0.2%~0.5%
P:0.07%~0.15%
S≤0.04%
Cu:0.25%~0.55%
Cr0.30%~1.25%
Ni≤0.65%
C≤0.12%
Si:0.25%~0.75%
Mn:0.2%~0.5%
P:0.07%~0.15%
S≤0.04%
Cu:0.25%~0.55%
Cr0.30%~1.25%
Ni≤0.65%
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