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| C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≥ | Ni≥ | Mo≥ | Cu≤ | ||||||
| 0.03 | 0.50 | 0.50 | 0.015 | 0.005 | 2.5-3.5 | 26.0-30.0 | - | 0.50 | ||||||
| ÆäËû | Al≤ | Ti≤ | Fe | Co≤ | B≤ | W≤ | Nb≤ | |||||||
| 5.0-6.0 | 0.4 | 24.0-27.0 | Óà | 0.003-0.012 | - | 2.5-3.5 | ||||||||