AISI 4140
LOW ALLOY STEEL
LOW ALLOY 4140: ASTM A29 (VO1.05)
GENERAL SCOPE
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 favour in many applications requiring higher strength levels up to 150 KSI 0.2% PS. It is extensively used in tubular form for downhole tools.
Several hybrid analyses are available all based on the AISI chemistry. The most common change is to increase the Molybdenum level at 0.35% max to improve the hardenability.
The hardenability limitations of this grade (depth to which it will harden / obtain the specified mechanical properties after heat treatment) must always be taken into account when designing and selecting equipment. Howco has significant experience heat treating this grade and other strength levels can be considered.
CHEMICAL COMPOSITION
| C | Si | Mn | P | S | Cr | Mo | Fe | |
|---|---|---|---|---|---|---|---|---|
| Min | 0.38 | 0.15 | 0.75 | . | . | 0.80 | 0.15 | 0.00 |
| Max | 0.43 | 0.35 | 1.00 | 0.035 | 0.040 | 1.10 | 0.25 | 0.00 |
MECHANICAL PROPERTIES
| U.T.S | 100 KSI Min | |
| 0.2% Proof Stress | 80 KSI Min | |
| Elongation | 20 % | |
| Red of Area | 40 % |
| U.T.S | 130 KSI Min | |
| 0.2% Proof Stress | 110 KSI Min | |
| Elongation | 13 % | |
| Red of Area | 30 % |