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Alloy steel tubes SAE AISI 4130 4140 4340 seamless steel pipes for machinery

Alloy steel tubes SAE AISI 4130 4140 4340 seamless steel pipes can be either hot rolled or cold drawn. The technical standard is ASTM A519. A519 specification covers seamless hot rolled mechanical tubes and seamless cold drawn mechanical tubes up to 12.75 inches (323.8mm) outside diameter.

SAE AISI 4130 4140 4340 alloy steel tube chemical composition:

Grade C Mn P S Si Ni Cr Mo
4130 0.28-0.33 0.40-0.60 0.040 0.040 0.15-0.35   0.80-1.10 0.15-0.25
4140 0.38-0.43 0.75-1.00 0.040 0.040 0.15-0.35   0.80-1.10 0.15-0.25
4340 0.38-0.43 0.60-0.80 0.040 0.040 0.15-0.35 1.65-2.00 0.70-0.90 0.20-0.30

Alloy steel tube SAE AISI 4130 4140 4340 chromoly pipe mechanical properties:

Steel Delivery Tensile Strength Yield Strength Elongation Hardness
Grade State Ksi Mpa Ksi Mpa (50mm) (HB)
4130 HR 90 621 70 483 20 89
SR 105 724 85 586 10 95
A 75 517 55 379 30 81
N 90 621 60 414 20 89
4140 HR 120 855 90 621 15 100
SR 120 855 100 689 10 100
A 80 552 60 414 25 85
N 120 855 90 621 20 100

Note: HR - hot rolling, CW - cold drawing, SR - stress relief, A - annealing, N - normalizing.

Alloy steel tubes SAE AISI 4130 4140 4340 seamless steel pipes quality assurance:
Magnetic Particle Testing (MT)
Eddy Current Flaw Detection (ET)
Ray detection (RT)
Penetration Testing (PT)
Ultrasonic Testing (UT)

SAE AISI 4130 4140 4340 seamless steel tubes are widely used in industrial equipment, oil and gas industry, etc. The cold drawn 4130 4140 4340 steel pipes are preferred to make motor rotor. BBN 4130 4140 4340 chromoly tubes are exported all over the world, especially in Russia etc. countries.

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