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| Material Designation | Standard | Same grade, different standards. | Source factory |
|---|---|---|---|
| 55Si2MnB | GB /T 1222-1984
Spring Steel |
- | |
| 60CrMnMoA | GB /T 1222-1984
Spring Steel |
- | |
| 55Si2Mn | GB /T 1222-1984
Spring Steel |
- |