4130, 4140, 4142 Pipe and Tube Specifications

The content of 4140 steel includes chromium, molybdenum and iron. The molybdenum and chromium components give it a uniform hardness, as well as high strength. Because of this strength, 4140 steel is easily machined and responds well to heat treatment. 4140 steel is tough with high fatigue strength. The list of industries that use it to manufacture their products is extensive because of the versatility found in this grade of steel. It has a tensile strength of 95,000 psi and yield strength of 60,000 psi. 4140 steel is available for purchase in bar shapes, rods, sheets and strips in sizes suitable for a wide range of uses.

Chemical composition

Data	4130	4140	4142
Carbon max. %	0.28 – 0.33	0.38 – 0.43	0.40 – 0.45
Manganese %	0.40 – 0.60	0.75 – 1.00	0.75 – 1.00
Phosphorous, max. %	0.04	0.04	0.04
Sulfur, max. %	0.04	0.04	0.04
Silicon, min.%	0.15 – 0.35	0.15 – 0.35	0.15 – 0.35
Chrome, max. %	0.80 – 1.10	0.80 – 1.10	0.80 – 1.10
Molybdenum, max. %	0.15 – 0.25	0.15 – 0.25	0.15 – 0.25

Mechanical Properties

The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.

Mechanicals	Heat Condition	Hardness	Yield	Tensile
A519-4130 / 4140	Quenched and Tempered	28-32 RC	Not Tested	Not Tested
API 5CT L80 in 4519-4100	Quenched and Tempered	18-22 RC	80 – 95 ksi	95 ksi min
API 5CT P110 in 4519-4100	Quenched and Tempered	30-36 RC	110 – 140 ksi	125 ksi min
API 5CT Q125 in 4519-4100	Quenched and Tempered	32-36 RC	125 – 150 ksi	135 ksi min

Heat Conditions for 4100 Alloys

Condition	Grade	Medium
Annealed	A519-4130 CD	Air
Annealed or Normalized	A519-4130 /A519-4140	Air
Quenched and Tempered	A519-4130	Water
Quenched and Tempered	A519-4140	Polymer or Oil
Quenched and Tempered	A519-4142	Oil