原料执行标准:YB/T146-1998 | 牌号 | 化学成分 ﹪ | C | Si | Mn | P | S | Cu | 72MnA | 0.70~0.75 | 0.12~0.32 | 0.60~0.90 | ≦0.025 | ≦0.025 | ≦0.20 | 75 MnA | 0.73~0.78 | 0.12~0.32 | 0.60~0.90 | ≦0.025 | ≦0.025 | ≦0.20 | 77 MnA | 0.75~0.80 | 0.12~0.32 | 0.60~0.90 | ≦0.025 | ≦0.025 | ≦0.20 | 80 MnA | 0.78~0.83 | 0.12~0.32 | 0.60~0.90 | ≦0.025 | ≦0.025 | ≦0.20 | 82 MnA | 0.80~0.85 | 0.12~0.32 | 0.60~0.90 | ≦0.025 | ≦0.025 | ≦0.20 | |