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Table of Content

4140 steel suppliers
4140 Steel Price per Kg / Per Ton
4140 Steel Stocked Sizes
4140 Steel round bar Specifications / Chemical Composition
4140 Steel Forging
4140 Steel Heat Treatment
4140 Steel Hardening
4140 Steel Tempering
4140 Steel Machining
4140 Steel Welding
4140 Steel Round Bar Sizes

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4140 is a 1% chromium - molybdenum medium hardenability general purpose high tensile steel - generally supplied hardened and tempered in the tensile range of 850 - 1000 Mpa (condition T).4140 is now available with improved machinability, which greatly increases feeds and/or speeds, while also extending tool life without adversley affecting mechanical properties.

Pre hardened and tempered 4140 can be further surface hardened by flame or induction hardening and by nitriding.

4140 is used extensively in most industry sectors for a wide range of applications such as:
Adapters, Arbors, Axle Shafts, Bolts, Crankshafts, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pins Various, Pinions, Pump Shafts, Rams, Sockets, Spindles, Sprockets, Studs, Tool Holders, Torsion Bars, Worms etc..

Aisi 4140 steel price India

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4140 steel price per kg
US $800-1000 / Metric Ton

AISI 4140 Round Bar price per kg
INR : Rs 65 Per Kg

Sae 4140 Flat Bars price per kg
INR : Rs 100 Per Kg

AISI 4140 Steel Plate - 3 To 500 Mm
INR : Rs 120 Per Kg

42crmo Aisi 4140 Alloy Steel Round Bar Per Kg
US $200-1000 / Metric Ton

sae 4140 steel price,aisi 4140 steel,4140 steel price per kg
US $0.8-1.2 / Kilogram

Hot Rolled Peeled Steel Round Bars AISI 4140 steel price per kg
US $890.0-900.0 / Tons

4140 4340 ck67 alloy steel plate price per kg
US $600-800 / Ton

aisi 4140 stainless steel round bar price per kg with bright surface
US $868-2586 / Ton

4140 Plate Steel,4140 Alloy Steel,4140 Steel Price Per KG
US $800-1500 / Ton

sae 4140 alloy steel bar price per kg
US $500-1600 / Ton

Stocked Sizes

Rounds	8 mm to 690 mm Diameter
Hexagons	19.05 mm to 65 mm A/F
Hollow Bar	63 mm to 250 mm OD
Square	32 mm to 130 mm
Bar Finish
Peeled, Cold Drawn, Turned and Polished, Centreless Ground. or Hot Rolled.

Related Specifications
Australia	AS 1444-1996-4140
Germany	DIN 17212 W.Nr 1.7223 Type 41CrMo4 DIN 17200-1654 W.Nr 1.7225 Type 42CrMo4 DIN 17200 W.Nr 1.7227 Type 42CrMoS4
Great Britain	BS970-1955 EN19A BS970 Part 3:1991 709M40
International	ISO 683/II Type 3 ISO 683/IV Type 3a ISO 683/IV Type 3b
Japan	JIS G 4103 SNCM4 JIS G 4105 SCM4 JIS G 4105 SCM440
USA	AISI 4140 ASTM A29/A29M-91 4140 ASTM A322 4140 ASTM A331 4140 (Cold Finish) SAE 4140

Chemical Composition (Base Material)
	Min. %	Max %
Carbon	0.36	0.44
Silicon	0.10	0.40
Manganese	0.65	1.10
Chromium	0.75	1.20
Molybdenum	0.15	0.35
Phosphorous	0	0.04
Sulphur	0	0.04
Mechanical Property Requirements for Steels in the Heat-Treated Condition for Turned, Peeled or Ground Finish to AS1444-1996 4140 and BS970 Part 3-1991 709M40
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.
Mechanical Property Requirements for Steels Heat-Treated, and then Cold Finished to AS 1444 - 1996, and BS 970 Part 3 - 1991 709 M40
Mechanical Property Designation				R	S	T	U	V
Limited Ruling Section				63	63	63	63	63
Tensile Strength Mpa			Min	700	770	850	930	1000
			Max	850	930	1000	1080	1150
0.20% Proof Stress Mpa			Min	525	585	680	755	850
Elongation on 5.65√S0 %			Min	12	11	9	9	9
Hardness Brinell HB			Min	201	223	248	269	293
			Max	255	277	302	331	352
*Material stocked generally in condition T Check test certificate if critical for end use.
Forging
Heat to 1150 oC - 1200 oC maximum, hold until temperature is uniform throughout the section. Do not forge below 850 oC.Following forging operation the work piece should be cooled as slowly as possible.
Heat Treatment
Annealing
Heat to 800 oC - 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
Flame or Induction Hardening
4140 hardened and tempered bar can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc 50.Parts should be heated as quickly as possible to the austenitic temperature range (840 C - 870 C) and "required case depth followed by an immediate oil or water quench, depending upon hardness required, workpiece" size/shape and quenching arrangements. Following quenching to hand warm, most components should be tempered between 150 C - 200 C to remove quenching stresses in the case. This will have little effect on case hardness and will reduce the risk of grinding cracks.
Hardening
Heat to 840 oC - 875 oC, hold until temperature is uniform throughout the section, soak for 10 - 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.*Temper immediately while still hand warm.
Nitriding
4140 hardened and tempered bar can also be successfully nitrided, giving a surface hardness of up to Rc 60. Nitriding is carried out at 490 oC - 530 oC, followed by slow cooling (no quench) reducing the problem of distortion. Parts can therefore be machined to near final size, leaving a grinding allowance only. The tensile strength of the core is usually not affected since the nitriding temperature range is generally below the original tempering temperature employed.
Normalizing
Heat to 870 oC - 900 oC, hold until temperature is uniform throughout the section, soak for 10 - 15 minutes and cool in still air.
Stress Relieving
Heat to 680 oC - 700 oC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section, and cool in still air.
Tempering
Re-heat to 550 oC - 700 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
Notes on Heat Treatment
Heating temperatures, rate of heating and soaking times will vary due to factors such as work piece size/shape also furnace type employed, quenching medium and work piece transfer facilities etc..Please consult your heat treater for best results.
Machining
4140 in the hardened and tempered as supplied condition has good to very good machinability and operations such as sawing, turning, drilling, broaching, hobbing, milling and tapping can be carried out satisfactoraly using machine manufacturers recommendations for suitable tool type - feeds and speeds.
Welding
Welding of 4140 in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on 4140 while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 595 oC - 620 oC prior to hardening and tempering.If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be stress relieved at 15 oC below the original tempering temperature.
Welding Procedure
Welding of 4140 in whatever condition should always be carried out using low hydrogen electrodes - please consult your welding consumables supplier.
Suggested pre-heat temperature
Section			25mm	40mm	50mm	75mm	150mm +
oC			370	400	425	455	510
Post Welding
Maximum cooling rate 95 oC per hour down to 95 oC, follow by cooling in still air. N.B. No draught.It is recommended that the work piece if possible is wrapped in an heat resistant blanket or buried in sand etc..

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4140 ALLOY ROUND BAR Sizes | 4140 ALLOY ROUND BAR Weight

4140 is a chromium and molybdenum alloy steel that has an excellent weight to strength ratio. It is considerably stronger than standard steel. Although it is chromium steel and often referred to as "chromoly steel", it does not contain as much chromium as stainless steel. Therefore the corrosion resistant is improved compared to standard steel but not to the same degree as stainless steels. The purpose of the molybdenum is to add uniformity of hardness and strength to this alloy. 4140 responds readily to heat treatment and is relatively easy to machine in the heat treated condition. It has a tensile strength of 150,000 psi, yield strength of 130,000psi and approximately 35-45% elongation. This metal is typically used for bolts couplings, axle shafts, piston rods, tractor arms, clutch and flywheel components, sprockets, etc.

CHEMICAL ANALYSIS
C	Cr	Mn	Mo	P	Si	S
0.38-0.43	0.8-1.1	0.75-1	0.15-0.25	0.35 Max	0.15-0.35	0.04 Max

4140 Alloy Round Weight
Stock Length 20'
Size	Lbs/Ft	Annealed	Q&T
5/8" 4140 Alloy Steel Round Bars	1.044	X	X
3/4" 4140 Alloy Steel Round Bars	1.504	X	X
7/8" 4140 Alloy Steel Round Bars	2.046	X	X
1" 4140 Alloy Steel Round Bars	2.673	X	X
1-1/8" 4140 Alloy Steel Round Bars	3.383	X	X
1-1/4" 4140 Alloy Steel Round Bars	4.176	X	X
1-1/2" 4140 Alloy Steel Round Bars	6.014	X	X
1-5/8" 4140 Alloy Steel Round Bars	7.058		X
1-3/4" 4140 Alloy Steel Round Bars	8.186	X	X
2" 4140 Alloy Steel Round Bars	10.69	X	X
2-1/4" 4140 Alloy Steel Round Bars	13.53	X	X
2-1/2" 4140 Alloy Steel Round Bars	16.71	X	X
2-3/4" 4140 Alloy Steel Round Bars	20.21	X	X
3" 4140 Alloy Steel Round Bars	24.06	X	X
3-1/4" 4140 Alloy Steel Round Bars	28.23	X	X
3-1/2" 4140 Alloy Steel Round Bars	32.74	X	X
3-3/4" 4140 Alloy Steel Round Bars	37.59	X	X
4" 4140 Alloy Steel Round Bars	42.77	X	X
4-1/4" 4140 Alloy Steel Round Bars	48.28	X	X
4-1/2" 4140 Alloy Steel Round Bars	54.13	X	X
4-5/8" 4140 Alloy Steel Round Bars	57.18		X
4-3/4" 4140 Alloy Steel Round Bars	60.31	X	X
5" 4140 Alloy Steel Round Bars	66.82	X	X
5-1/4" 4140 Alloy Steel Round Bars	73.67	X	X
5-1/2" 4140 Alloy Steel Round Bars	80.86	X	X
6" 4140 Alloy Steel Round Bars	96.22	X	X
6-1/4" 4140 Alloy Steel Round Bars	104.4		X
6-1/2" 4140 Alloy Steel Round Bars	112.9	X	X
7" 4140 Alloy Steel Round Bars	131.0	X	X
7-1/4" 4140 Alloy Steel Round Bars	140.5	X	X
7-1/2" 4140 Alloy Steel Round Bars	150.4	X	X
7-3/4" 4140 Alloy Steel Round Bars	160.5		X
8" 4140 Alloy Steel Round Bars	171.1	X	X
8-1/4" 4140 Alloy Steel Round Bars	181.9	X	X
8-1/2" 4140 Alloy Steel Round Bars	193.1	X	X
9" 4140 Alloy Steel Round Bars	216.5	X	X
9-1/2" 4140 Alloy Steel Round Bars	241.2	X	X
10" 4140 Alloy Steel Round Bars	267.3	X	X
10-1/2" 4140 Alloy Steel Round Bars	294.7	X	X
11" 4140 Alloy Steel Round Bars	323.4	X	X
11-1/2" 4140 Alloy Steel Round Bars	353.5		X
12" 4140 Alloy Steel Round Bars	384.9	X	X
12-1/2" 4140 Alloy Steel Round Bars	417.6	X	X
14" 4140 Alloy Steel Round Bars	523.9	X	X
15" 4140 Alloy Steel Round Bars	601.4	X	X
16" 4140 Alloy Steel Round Bars	684.3	X	X
18" 4140 Alloy Steel Round Bars	866.0	X	X