工艺 | C | Si | Mn | P | S | Ti | Als |
原工艺 | 0.16~0.20 | 0.25~0.35 | 1.20~1.40 | ≤0.030 | ≤0.025 | — | 0.015~0.040 |
新工艺 | 0.16~0.20 | 0.25~0.35 | 0.70~0.90 | ≤0.030 | ≤0.025 | 0.030~0.050 | 0.015~0.040 |