AISI 4140 Tubing, a low-alloy steel marvel, combines manganese, molybdenum, and chromium, setting a benchmark for utility and adaptability. Equivalent materials and grades include EN# 1.7223, EN 42CrMo4, DIN 41CrMo4, BS 970 708M40, UNI 41CrMo4, and JIS SCM 440. This steel grade, unparalleled in usefulness, exhibits superb ductility, superior toughness, and outstanding wear resistance in tempered or quenched conditions.

AISI 4140 boasts a density of 0.284 lb/in³ (7.85 g/cm3) and a melting point of 2580 °F (1416 °C), contributing to its robust properties.

Exceptional impact resistance, high fatigue strength, superb torsional strength, excellent toughness, and remarkable abrasion resistance define AISI 4140, making it a standout choice in various applications.

The presence of molybdenum and chromium ensures excellent corrosion resistance, particularly against chlorides. This makes AISI 4140 suitable for environments where corrosion resistance is crucial. Manganese acts as a deoxidizer, enhancing hardenability and improving machinability. It combines with sulfur, making carburizing more effective.

SA179 Tube stocked Alloy Steel 4140 Tube meets or exceeds stringent industry standards, such as ASTM and SAE, ensuring reliability and performance in diverse applications.

Explore the unparalleled strength and versatility of AISI 4140 Tubing with TubeWell. Our commitment to quality and adherence to industry standards makes us your trusted source for Alloy Steel Tubing. Contact our experts at SA179 Tube to learn more about AISI 4140 Tube and our comprehensive range of services and products. Elevate your projects with TubeWell – Where Quality Meets Excellence.

4140 Tubing Specification

Dimensions	ASTM, ASME and API
Supplier of 4140 Alloy Steel Tube in Length	Within 13500 millimeter
Speciality in	Large Diameter Size
Size	4 to 219 millimeter W. T.: 0.5 to 20 millimeter
Length	In Single and Double Random & Cut to Length Suppliers
AISI 4140 Tube Type	Welded / Seamless / Fabricated / ERW
Form	Round, Square, Rectangular, Hydraulic.
End	Plain End, Threaded, Beveled End

4140 Steel Tubing Chemical Composition

Element	Content (%)
Iron, Fe	96.785 – 97.77
Chromium, Cr	0.80 – 1.10
Manganese, Mn	0.75 – 1.0
Carbon, C	0.380 – 0.430
Silicon, Si	0.15 – 0.30
Molybdenum, Mo	0.15 – 0.25
Sulfur, S	0.040
Phosphorous, P	0.035

4140 Chrome Moly Steel Tube Mechanical Properties

Properties	Metric	Imperial
Hardness, Vickers (converted from Brinell hardness)	207	207
Tensile strength	655 MPa	95000 psi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Yield strength	415 MPa	60200 psi
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)	13	13
Elastic modulus	190-210 GPa	27557-30458 ksi
Poisson’s ratio	0.27-0.30	0.27-0.30
Elongation at break (in 50 mm)	25.70%	25.70%
Shear modulus (typical for steel)	80 GPa	11600 ksi
Hardness, Brinell	197	197
Machinability (based on AISI 1212 as 100 machinability)	65	65
Hardness, Rockwell B (converted from Brinell hardness)	92	92
Hardness, Knoop (converted from Brinell hardness)	219	219

AISI 4140 Steel Pipe Grade Heat Treatment

Annealing	800 oC – 850 oC
Normalizing	870 oC – 900 oC
Tempering	550 oC – 700 oC

4140 Alloy Steel Tube Equivalent Grade

Standard/ Grade	UNS	Temper	Specification
AISI 4140 Alloy Steel	UNS G41400	A, N, T	AMS6381

Physical Strength of AISI 4140 Round tube

Properties	Metric	Imperial
Density	7.85 g/cm3	0.284 lb/in³
Melting point	1416°C	2580°F

Weight Table of ASTM A519 Grade 4140 Tubes

Size NPS	Tube O.D.	Wall Thickness	Tube I.D.	Weight per Foot	Standard to XXHY	Schedule Tube #	Section Modulus	Gallon Capacity Per Linear Foot
1/2	0.84	0.109	0.622	0.85	STD	40	.0407	.0158
		0.147	0.546	1.09	XHY	80	.0478	.0122
		0.188	0.464	1.31		160	.0528	.0088
		0.294	0.252	1.72	XXHY		.0577	.0026
3/4	1.05	0.113	0.824	1.13	STD	40	.0705	.0277
		0.154	0.742	1.48	XHY	80	.0853	.0225
		0.219	0.612	1.95		160	.1006	.0153
		0.308	0.434	2.44	XXHY		.1103	.0077
1	1.315	0.133	1.049	1.68	STD	40	.1328	.0449
		0.179	0.957	2.17	XHY	80	.1606	.0374
		0.250	0.815	2.85		160	.1904	.0271
		0.358	0.599	3.66	XXHY		.2136	.0146
1 1/4	1.66	0.140	1.380	2.27	STD	40	.2346	.0777
		0.191	1.278	3.00	XHY	80	.2913	.0666
		0.250	1.160	3.77		160	.3421	.0549
		0.382	0.896	5.22			.4110	.0328
1 1/2	1.90	0.145	1.610	2.72	STD	40	.3262	.1058
		0.200	1.500	3.63	XHY	80	.4118	.0918
		0.281	1.338	4.86		160	.5079	.0730
		0.400	1.100	6.41			.5977	.0494
2	2.375	0.109	2.157	2.64		10	.4205	.1898
		0.154	2.067	3.66	STD	40	.5606	.1743
		0.218	1.939	5.03	XHY	80	.7309	.1534
		0.250	1.875	5.68			.8045	.1434
		0.281	1.813	6.29			.8666	.1344
		0.344	1.687	7.47		160	.9806	.1161
		0.436	1.503	9.04	XXHY		1.1043	.0922
2 1/2	2.875	0.120	2.635	3.53		10	.6870	.2833
		0.203	2.469	5.80	STD.	40	1.0640	.2487
		0.216	2.443	6.14			1.1169	.2435
		0.250	2.375	7.02			1.2468	.2301
		0.276	2.323	7.67	XHY	80	1.3386	.2202
		0.375	2.125	10.02		160	1.6371	.1842
		0.552	1.771	13.71	XXXHY		1.9971	.1280
3	3.50	0.120	3.260	4.34			1.0411	.4336
		0.156	3.188	5.58			1.3122	.4147
		0.172	3.156	6.12			1.4265	.4064
		0.188	3.124	6.66			1.5342	.3984
		0.216	3.068	7.58	STD.	40	1.7241	.3840
		0.250	3.000	8.69			1.9372	.3672
		0.281	2.938	9.67			2.1207	.3521
		0.300	2.900	10.26	XHY	80	2.2253	.3431
		0.438	2.624	14.34		160	2.8774	.2811
		0.600	2.300	18.6	XXHY		3.4243	.2158
3 1/2	4.0	0.120	3.760	4.98		10	1.3776	.5768
		0.226	3.548	9.12	STD.	140	2.3939	.5136
		0.250	3.500	10.02			2.6001	.4998
		0.281	3.438	11.17			2.8562	.4821
		0.318	3.364	12.52	XHY	80	3.1400	.4617
		0.636	2..728	22.87	XXHY		4.8795	.3085
4	4.5	0.120	4.260	5.62		10	1.7612	.7404
		0.156	4.188	7.24			2.2354	.7156
		0.188	4.124	8.67			2.6296	.6942
		0.203	4.094	9.32			2.8173	.6838
		0.219	4.062	10.02			3.0184	.6725
		0.237	4.026	10.80	STD.	40	3.2145	.6613
		0.250	4.000	11.36			3.3611	.6528
		0.281	3.938	12.67		60	3.7021	.6326
		0.312	3.876	13.97			4.0273	.6126
		0.337	3.826	15.00	XHY	80	4.2713	.5972
		0.438	3.624	19.02		120	5.1790	.5361
		0.531	3.438	22.53		160	5.8997	.4822
		0.674	3.152	27.57	XXHY		6.7927	.4054
5	5.563	0.188	5.187	10.80			4.1161	1.0979
		0.219	5.125	12.51			4.7279	1.0716
		0.258	5.047	14.63	STD.	40	5.4500	1.0391
		0.281	5.001	15.87			5.8644	1.0204
		0.312	4.939	17.51			6.4074	.99647
		0.344	4.875	19.19			6.9358	.9696
		0.375	4.813	20.80	XHY	80	7.4300	.9449
		0.500	4.563	27.06		120	9.2534	.8495
		0.625	4.313	32.99		160	10.7976	.7590
		0.750	4.063	38.59	XXHY		12.0954	.6734
6	6.625	0.109	6.407	7.59		5	3.5769	1.6748
		0.134	6.357	9.30		10	4.3475	1.6488
		0.156	6.313	10.79			5.0107	1.6260
		0.188	6.249	12.94			5.9351	1.5937
		0.203	6.219	13.94			6.3804	1.5780
		0.219	6.187	15.00			6.8261	1.5620
		0.250	6.125	17.04			7.6905	1.5306
		0.280	6.065	18.99	STD.	40	8.4958	1.5008
		0.312	6.001	21.06			9.3416	1.4688
		0.344	5.937	23.10			10.111	1.4391
		0.375	5.875	25.05			10.893	1.4082
		0.432	5.761	28.60	XHY	80	12.224	1.3541
		0.500	5.625	32.74			13.711	1.2909
		0.562	5.501	36.43		120	14.9806	1.2346
		0.625	5.375	40.09			16.1821	1.1787
		0.719	5.187	45.39		160	17.8243	1.0977
		0.864	4.897	53.21	XXHY		20.025	.9784
		1.000	4.625	60.13			21.7719	.8727
		1.125	4.375	66.14			23.1237	.7809

Suppliers of UNS G41400 q&t Tube in various Sizes

NB	Size	OD	40S	5S	10S	S10	S20	S40	S60	XS/80S	S80	S100	S120	S140	S160	XXS
		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
	1/8″	10.29			1.2			1.73			2.41
	1/4″	13.72			1.7			2.24			3.02
	3/8″	17.15			1.7			2.31			3.2
15	1/2″	21.34	2.8	1.7	2.1			2.77		3.73	3.73				4.78	7.47
20	3/4″	26.67	2.9	1.7	2.1			2.87		3.91	3.91				5.56	7.82
25	1″	33.4	3.4	1.7	2.8			3.38		4.55	4.55				6.35	9.09
32	1 1/4″	42.16	3.6	1.7	2.8			3.56		4.85	4.85				6.35	9.7
40	1 1/2″	48.26	3.7	1.7	2.8			3.68		5.08	5.08				7.14	10.2
50	2″	60.33	3.9	1.7	2.8			3.91		5.54	5.54				9.74	11.1
65	2 1/2″	73.03	5.2	2.1	3.1			5.16		7.01	7.01				9.53	14
80	3″	88.9	5.5	2.1	3.1			5.49		7.62	7.62				11.1	15.2
90	3 1/2″	101.6	5.7	2.1	3.1			5.74		8.08	8.08
100	4″	114.3	6	2.1	3.1			6.02		8.56	8.56		11.1		13.5	17.1
125	5″	141.3	6.6	2.8	3.4			6.55		9.53	9.53		12.7		15.9	19.1
150	6″	168.3	7.1	2.8	3.4			7.11		10.97	11		14.3		18.3	22
200	8″	219.1	8.2	2.8	3.8		6.4	8.18	10.3	12.7	12.7	15.1	19.3	20.6	23	22.2
250	10″	273.1	9.3	3.4	4.2		6.4	9.27	12.7	12.7	15.1	19.3	21.4	25.4	28.6	25.4
300	12″	323.9	9.5	4	4.6		6.4	10.3	14.3	12.7	17.5	21.4	25.4	28.6	33.3	25.4
350	14″	355.6	9.5	4	4.8	6.4	7.9	11.1	15.1	12.7	19.1	23.8	27.8	31.8	35.7
400	16″	406.4	9.5	4.2	4.8	6.4	7.9	12.7	16.7	12.7	21.4	26.2	31	36.5	40.5
450	18″	457.2	9.5	4.2	4.8	6.4	7.9	14.3	19.1	12.7	23.8	29.4	34.9	39.7	45.2
500	20″	508	9.5	4.8	5.5	6.4	9.5	15.1	20.6	12.7	26.2	32.5	38.1	44.5	50
550	22″	558.8	9.5	4.8	5.5	6.4	9.5		22.2	12.7	28.6	34.9	41.3	47.6	54
600	24″	609.6	9.5	5.5	6.4	6.4	9.5	17.5	24.6	12.7	31	38.9	46	52.4	59.5
650	26″	660.4	9.5			7.9	13			12.7
700	28″	711.2	9.5			7.9	13			12.7
750	30″	762	9.5	6.4	7.9	7.9	13			12.7
800	32″	812.8	9.5			7.9	13	17.5		12.7
850	34″	863.6	9.5			7.9	13	17.5		12.7
900	36″	914.4	9.5			7.9	13	19.1		12.7

Mechanical Analysis Requirements for 4140 Square Tube Heat-Treated

Mechanical Property Designation		R	S	S	*T	U	V	W
Limited Ruling Section mm		250	250	150	100	63	30	20
Tensile Strength Mpa	Min	700	770	770	850	930	1000	1080
	Max	850	930	930	1000	1080	1150	1230
0.2% Proof Stress Mpa	Min	480	540	570	655	740	835	925
Elongation on 5.65√S0 %	Min	15	13	15	13	12	12	12
Izod Impact J	Min	34	27	54	54	47	47	40
Charpy Impact J	Min	28	22	50	50	42	42	35
Hardness Brinell HB	Min	201	233	233	248	269	293	311
	Max	255	277	277	302	331	352	375
*Material stocked generally in condition T Check test certificate if critical for end use.

Pre-heat temperature for 4140 Dom Tubing

Section	25mm	40mm	50mm	75mm	150mm +
oC	370	400	425	455	510

Applications of 4140 Tubing

• Oil and Gas Exploration: 4140 Tubing plays a pivotal role in the oil and gas sector, finding application in drill collars, tool joints, and critical components that navigate the challenging environments of exploration and extraction. Its high-stress resistance ensures reliability in demanding conditions.
• Structural Fabrication: In the realm of structural components and machinery parts, 4140 Tubing emerges as a versatile choice. Its adaptability allows for seamless integration into diverse structural frameworks, contributing to the strength and resilience of industrial equipment.
• High-Strength Fasteners: Machinability is a standout feature of 4140 Tubing, making it a preferred material for the production of high-strength fasteners. This application showcases its precision and reliability, meeting the stringent requirements of various industrial assemblies.
• Aerospace Engineering: The aerospace industry benefits from the robust qualities of 4140 Tubing, utilizing it in the fabrication of components that demand high strength, toughness, and resistance to fatigue. Its ability to withstand stress makes it a valuable asset in aerospace applications.
• Automotive Manufacturing: In the automotive sector, 4140 Tubing finds application in critical components that require strength, durability, and the ability to withstand varying stresses. Its use contributes to the reliability and performance of automotive systems.
• Machinery and Equipment:  Across diverse industries, 4140 Tubing serves in the fabrication of machinery and equipment. Its resilience under high stress, coupled with its machinability, makes it a go-to material for creating components that endure rigorous operational conditions.

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