Low alloy 4140: ASTM A29 (VO1.05)
AISI 4140 low alloy steel containing Chromium and Molybdenum is the most widely used alloy for oil patch applications. Usually supplied in the hardened and tempered condition at 22 HRC max. it also finds favour in many applications requiring higher strength levels up to 150 KSI 0.2% PS. The grade is not NACE MR0175 approved in these conditions, and should not be used in environments containing H2S.
It is extensively used in tubular form for downhole tools.
Several hybrid analysis are available all based on the AISI chemistry. The most common change is to increase the Molybdenum level at 35% max on diameters, typically greater than 6". Increasing Molybdenum improves 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.
Condition: Hardened and Tempered to 22 HRC max
|U.T.S||100 KSI Min||(689 N/mm2)|
|0.2% Proof Stress||80 KSI Min||(551 N/mm2)|
|Red of Area||40 %|
Condition: Hardened and Tempered to 30-36 HRC max
|U.T.S||130 KSI Min||(896 N/mm2)|
|0.2% Proof Stress||110 KSI Min||(758 N/mm2)|
|Red of Area||30 %|
|Size range: 1”∅ - 28”∅|
Primarily manufactured in:
- Dubai, UAE
- Edmonton, Canada
- Houston, Texas
- Sheffield, England