| Raw materials | The finished product processing equiremented |
| 38CrMoAIA, SACM645 | Nitriding treatment |
| Cr12MoV, Cr12 | Alloy steel,high frequency quenching |
| 38CrMoAIA,SACM645, 40Cr,AISI4140,42CrMo | Bimetllic of the inner centrifugal casting |
| GHII3 | nature hard after high temperature |