| 元素 | C | Si | Mn | P | S | Cr | Ni | Mo | Nb | Ti | B |
| 含量 | ≤0.20 | ≤0.80 | ≤2.0 | ≤0.020 | ≤0.010 | ≤1.50 | ≤2.00 | ≤0.70 | ≤0.06 | ≤0.05 | ≤0.005 |