C | Si | Mn | Cr | Ni | Mo | Cu | Ti | Nb |
0.16 - 0.18 | 0.3 - 0.4 | 1.1 - 1.3 | 0.38 - 0.42 | 0.28 - 0.32 | 0.48 - 0.55 | 0.35 - 0.41 | 0.015 - 0.025 | 0.015 - 0.025 |