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
Tolerances
Condition OD Wall
Annealed or Normalized ASTM A519 ASTM A519
Quenched and Tempered +/-1% +/-12.5%
  • ASTM A213 T11 Seamless alloy pipe
    ASTM A213 T11 Standard covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes.

Leave a Reply

Your email address will not be published. Required fields are marked *