| C | Cr | Ni | Fe | Mn | Si | Mo | Co | P | S | V | W | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | . | 14.5 | . | 4.0 | . | . | 15 | . | . | . | . | 3.0 |
| Max | 0.02 | 16.5 | Bal | 7.0 | 1.0 | 0.08 | 17 | 2.5 | 0.03 | 0.03 | 0.35 | 4.5 |
| 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 |
| 140 | 140KSI (965Mpa) | 160KSI (1103Mpa) | ≥145KSI (1000Mpa) | 9 | ≤38 |