AISI 4145H is a medium carbon chromium-molybdenum alloy steel. It is a high strength, high hardenability steel grade commonly used in heavy load and high temperature environments.
It is commonly used in the oil and gas industry for drill collars, drill pipe joints, wellhead equipment, as well as pump rods and valves.
| C | Mn | Si | P | S | Cr | Fe | Mo | Cu | V | Al | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min. | 0.43 | 0.80 | 0.20 | . | . | 0.85 | Bal. | 0.25 | . | . | 0.01 |
| Max. | 0.48 | 1.20 | 0.35 | 0.02 | 0.02 | 1.20 | Bal. | 0.35 | 0.30 | 0.05 | 0.035 |
Condition: Hardened and Tempered.
| Yield Strength | Tensile Strength | Elongation (%) | Hardness (HB) | Impact Charpy-V, -20ºC (J) | Impact Charpy-V, 0ºC (J) |
|---|---|---|---|---|---|
| ≥80KSI (551Mpa) | ≥100KSI (689Mpa) | ≥15% | 285-341 | ≥27 | ≥41 |