AISI 4140 G41400 SCM440 42CrMo4 1.7225 Alloy Steel Seamless Round Tube

Categories	Hollow Bars
Brand	fushun
Model	4140 G41400 SCM440 42CrMo4 1.7225
OD	40-400MM
WT	5-30MM
Delivery condition	QT
Surface condition	peeled
Update Time	Apr 20,2024

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Detail Information

Introduce

4140 Seamless Tubing Are The Low Alloy Materials Used In The Industries. It Consists Of Manganese, Molybdenum And Chromium Chemical Components Which Adds Advanced Properties And Characteristics To AISI 4140 Material. Hence, Making It More Applicable For The Applications As Compared To Other Materials.The Molybdenum Chemical Component Used To Enhance The Resistivity Of The Material In High Elevated Temperatures.

Applications

Superior tensile strength and toughness

High strength to weight ratio

Easily heat treatable to a broad range of strength, machinability, and hardness.

Applications: aircraft components, hydraulic cylinders, rollers, structural apps, truck and automotive parts.

Standard

ASTM A519 2003 Seamless Carbon and Alloy Steel Mechanical Tubing

Chemical Composition (%)

Steel (UNS)	C	Si	Mn	P (≤)	S (≤)	Cr	Mo
4140 (G41400)	0.38-0.43	0.15-0.35	0.75-1.00	0.035	0.040	0.80-1.10	0.15-0.25

Mechanical Property

Steel	Tensile strength (Mpa)	Yield strength (Mpa)	Elongation in 50 mm, %	Reduction in area, %	Hardness (HB)	Sample diameter	Conditions
AISI 4140	1020	655	17.7	46.8	302	25.4mm (1 inch)	Normalized at 870 °C
	655	414	25.7	56.9	197		Annealed at 815 °C
	1075	986	15.5	56.9	311		Water quenched from 845 °C & tempered at 540 °C

Machinability 

Machinability of 4140 Steel

AISI 4140 alloy steel has good machinability in the annealed condition.

Forming of 4140 Steel

AISI 4140 alloy steel has high ductility. It can be formed using conventional techniques in the annealed condition. It requires more pressure or force for forming because it is tougher than plain carbon steels.

Welding of 4140 Steel

AISI 4140 alloy steel can be welded using all conventional techniques. However, the mechanical properties of this steel will be affected if it is welded in the heat-treated condition, and post-weld heat treatment should be performed.

Heat Treatment

AISI 4140 has enough carbon present to allow for adequate heat treatment. Recommended hardening procedures are to bring the steel up to 1,675 degrees Fahrenheit for normalization (removal of stress within the steel). After it cools properly, heat the steel to 1,550 degrees Fahrenheit before quenching it in oil. The toughness of the steel makes machining in its hardened form difficult. However, after annealing the steel at 1,600 degrees followed by a slow cooling, the steel is much softer and far easier to machine. It can then be heat-treated after machining to produce a hard, precise item.