| 元 素 | 規定化學成分 上限值 | 允許偏差 | |
| 上偏差 | 下偏差 | ||
| C | ≤0.25 | 0.02 | 0.02 |
| >0.25~0.55 | 0.03 | 0.03 | |
| >0.55 | 0.04 | 0.04 | |
| Mn | ≤0.80 | 0.03 | 0.03 |
| >0.80~1.70 | 0.06 | 0.06 | |
| Si | ≤0.37 | 0.03 | 0.03 |
| >0.37 | 0.05 | 0.05 | |
| S | ≤0.050 | 0.005 | - |
| >0.05~0.35 | 0.02 | 0.01 | |
| P | ≤0.060 | 0.005 | - |
| >0.06~0.15 | 0.01 | 0.01 | |
| V | ≤0.20 | 0.02 | 0.01 |
| Ti | ≤0.20 | 002 | 0.01 |
| Nb | 0.015~0.060 | 0.005 | 0.005 |
| Cu | ≤0.55 | 0.05 | 0.05 |
| Cr | ≤1.50 | 0.05 | 0.05 |
| Ni | ≤1.00 | 0.05 | 0.05 |
| Pb | 0.15~0.35 | 0.03 | 0.03 |
| Al | ≥0.015 | 0.003 | 0.003 |
| N | 0.010~0.020 | 0.005 | 0.005 |
| Ca | 0.002~0.006 | 0.002 | 0.0005 |