AISI 4130 Steel

This is a low alloy steel containing nominally 0.3% carbon, 1% chromium and 0.2% molybdenum.
4130 steel is a low alloy steel that is used in structural designs that may be found in applications such as aircraft engine mounts or welded tubing. It is well known for its ease of welding and ability to harden in commercial applications. It is commonly referred to as chromium-molybdenum steel.

AISI 4130 pipe

AISI 4130 is a low alloy steel containing molybdenum and chromium as strengthening agents.

Thermal and Electric Specifications of AISI 4130

AISI 4130 is a thermal conductor capable of a rating of 42.7 measured at 100 degrees Celsius. The specific heat it can handle is 477 at 50 to 100 degrees Celsius. The electric resistivity has been measured at 223 when tested at 20 degrees Celsius.

Heating Specifications of AISI 4130

AISI 4130 can be heated as a way to harden the material. When hardening is desired, the material should be heated at a minimum of 1600 degrees F. followed by an oil quench. The best results can be obtained when heating occurs between 1650 and 1700 degrees, followed by an oil quench and soak of 1600 degrees. If the material loses too much ductility during this process, the material can be tempered to restore some of the function. Tempering should be conducted at temperatures between 750 and 1050 degrees, depending on the resultant strength desired. The lower temperatures generally result in greater strengths during the tempering process. Heating can also be used to make the material easier to work with. Manipulation heating can be best conducted in a range of 2000 to 1500 degrees.

Composition Specifications of AISI 4130

Range C Si Mn P S Cr Mo
Min 0.28 0.15 0.4 - - 0.8 0.15
Max 0.33 0.35 0.6 0.035 0.04 1.1 0.25

Mechanical Specifications of AISI 4130

Condition Hardened & Tempered
UTS 100KSI min
0.2% Proof Stress 80KSI min
Elongation 20% min
Reduction of Area 40% min

General Scope

This grade is similar to 4140 in scope which has a higher carbon level giving 4130 an advantage when it comes to weldability, this weldability is achieved at the cost of through section hardenability.

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