化学成分：
C 0.22-0.29%
Si ≤0.40%
Mn 0.40-0.70%
P ≤0.045%
S ≤0.045%
Cr≤0.40%
Mo≤0.10%
Ni≤0.40%
C 0.22-0.29%
Si ≤0.40%
Mn 0.40-0.70%
P ≤0.045%
S ≤0.045%
Cr≤0.40%
Mo≤0.10%
Ni≤0.40%
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