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★E28-2执行标准：NFA 35-501 1987★E28-2化学成份：E28-2碳C：≤0.21E28-2硅Si：≤0.50E28-2锰Mn：≤1.50E28-2硫S：≤0.035E28-2磷P：≤0.035★E28-2力学性能：抗拉强度（σb/MPa）：≧410-560屈服点（σs/MPa）：≧275断后伸长率（δ5/%）：≧20冲击功Akv20度 ：≥27 J