| C | Cr | Ni | Fe | Mn | Si | Mo | Cu | P | S | W | N | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min. | . | 24.0 | 5.5 | bal | . | . | 2.5 | 0.2 | . | . | 0.1 | 0.1 |
| Max. | 0.03 | 25.0 | 7.5 | bal | 1.00 | 0.75 | 3.5 | 0.8 | 0.03 | 0.03 | 0.5 | 0.3 |
| Grade | Yield Strength | Tensile Strength | Elongation(%) | Hardness(HRC) | |
|---|---|---|---|---|---|
| Min | Max | ||||
| 75 | 75KSI (517Mpa) | 100KSI (689Mpa) | ≥90KSI (621Mpa) | 25 | ≤26 |
| 110 | 110KSI (758Mpa) | 140KSI (965Mpa) | ≥125KSI (862Mpa) | 11 | ≤36 |
| 125 | 125KSI (862Mpa) | 145KSI (1000Mpa) | ≥130KSI (896Mpa) | 10 | ≤36 |