化学成分：
碳C：≤0.24%
锰Mn：≤1.60%
磷P：≤0.035%
硫S：≤0.035%
硅Si：≤0.55%
铜Cu：≤0.55%
氮N:≤0.012%
碳C：≤0.24%
锰Mn：≤1.60%
磷P：≤0.035%
硫S：≤0.035%
硅Si：≤0.55%
铜Cu：≤0.55%
氮N:≤0.012%
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