这是普通碳钢材质牌号等级化学成分（质量分数）（%）CMnSiSP≤Q235A0.14~0.220.30~0.650.300.0500.045B0.12~0.200.30~0.700.045C≤0.180.35~0.800.0400.040D≤0.170.0350.035Q235力学性能牌号拉力强度MPa屈服点MPa伸长率（%）Q235375~50023526