船板力学性能与化学成分　　船板力学性能与化学成分　　一般强度船体结构钢力学性能与化学成份钢材级别屈服点σs(MPa)不小于抗拉强度σb(MPa)伸长率σ%　　不小于碳C锰Mn硅Si硫S磷PA235400-52022≤0.21≥2.5≤0.5≤0.035≤0.035B≤0.21≥0.80≤0.35     D≤0.21≥0.60≤0.35     E≤0.18≥0.70≤0.35     　高强度船体结构钢力学性能与化学成份钢材级别屈服点σs(MPa)不小于抗拉强度σb(MPa)伸长率σ%　　不小于碳C锰Mn硅Si硫S磷PA32315440-57022≤0.18≥0.9-1.60≤0.50≤0.035≤0.035D32        E32        F32≤0.16≤0.025≤0.025     A36355490-63021≤0.18≤0.035≤0.035  D36        E36        F36≤0.16≤0.025≤0.025     A40390510-66020≤0.18≤0.035≤0.035  D40        E40        F40≤0.16≤0.025≤0.025