化学成分：
| C | Si | Mn | P | S | Cr | Ni | Mo | Nb | V | Ti | B |
|
≤ 0.18 |
≤ 0.50 |
≤ 1.50 |
≤ 0.020 |
≤ 0.010 |
≤ 0.90 |
≤ 1.20 |
≤ 0.60 |
≤ 0.06 |
≤ 0.08 |
≤ 0.03 |
≤ 0.003 |
