| C | Cr | Ni | Fe | Mn | Si | Mo | Co | Cu | P | S | Nb+Ta | W | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | . | 21.0 | . | 18.0 | . | . | 6.0 | . | 1.5 | . | . | . | . |
| Max | 0.015 | 23.5 | Bal | 21.0 | 1.0 | 1.0 | 8.0 | 5.0 | 2.5 | 0.04 | 0.03 | 0.50 | 1.5 |
| Grade | Yield Strength | Tensile Strength | Elongation(%) | Hardness(HRC) | |
|---|---|---|---|---|---|
| Min | Max | ||||
| 110 | 110KSI (758Mpa) | 140KSI (965Mpa) | ≥115KSI (793Mpa) | 11 | ≤35 |
| 125 | 125KSI (862Mpa) | 150KSI (1034Mpa) | ≥130KSI (896Mpa) | 10 | ≤37 |