Complete specifications for AISI 4140 low alloy steel, the most widely used chromium-molybdenum steel for oil patch applications and high-strength manufacturing components.
AISI 4140 low alloy steel containing chromium and molybdenum is the most widely used low alloy steel for oil patch applications. Usually supplied in the hardened and tempered condition at 22 HRC maximum, it also finds favor in applications requiring higher strength levels up to 150 KSI.
The hardenability limitations of this grade must always be taken into account when designing equipment. Several hybrid analyses are available, with the most common modification increasing molybdenum to 0.35% max to improve hardenability.
| Element | Min % | Max % |
|---|---|---|
| C | 0.38 | 0.43 |
| Si | 0.15 | 0.35 |
| Mn | 0.75 | 1.00 |
| P | - | 0.035 |
| S | - | 0.040 |
| Cr | 0.80 | 1.10 |
| Mo | 0.15 | 0.25 |
| Fe | Balance | Balance |
Excellent hardenability and strength for demanding downhole applications
High strength-to-weight ratio with good toughness and wear resistance
Get competitive pricing on high-quality AISI 4140 with complete material certifications, heat treatment services, and precision machining capabilities.