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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