C | Si | Mn | P | S | Al | N | Cu | Cr | Mo | Ni | Ti | Nb | V |
≤0.18 | ≤0.50 | 1.10~1.70 | ≤0.025 | ≤0.015 | ≥0.020 | ≤0.012 | ≤0.30 | ≤0.30 | ≤0.08 | ≤0.50 | ≤0.03 | ≤0.05 | ≤0.10 |