化学成分：
| C | Si | Mn | P | S |
| ≤0.25 | ≤0.70 | ≤1.30 | ≤0.025 | ≤0.025 |
| Cr | Mo | Ni | B | |
| ≤1.4 | ≤0.50 | ≤1.00 | ≤0.004 |
| C | Si | Mn | P | S |
| ≤0.25 | ≤0.70 | ≤1.30 | ≤0.025 | ≤0.025 |
| Cr | Mo | Ni | B | |
| ≤1.4 | ≤0.50 | ≤1.00 | ≤0.004 |
| C | Si | Mn | P | S |
| ≤0.25 | ≤0.70 | ≤1.30 | ≤0.025 | ≤0.025 |
| Cr | Mo | Ni | B | |
| ≤1.4 | ≤0.50 | ≤1.00 | ≤0.004 |
