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42CrMo4 , also known as chrome-molybdenum steel, belongs to the group of low-alloy quenched and tempered steels and contains the alloying elements chromium (Cr) and molybdenum (Mo). This steel is commonly produced and shaped into rolls, plates, bars, or cast parts, thanks to its excellent mechanical properties and wide range of applications.

International Standards for 42CrMo4 (AISI/SAE 4140)

42CrMo4 is classified under several international standards:

AISI/SAE: 4140
DIN: 1.7225
AFNOR (France): 42 CD 4
Turkish Standard (TS EN 10250): 42CrMo4

Mechanical Properties of 42CrMo4

Thanks to its alloying elements, 42CrMo4 exhibits outstanding mechanical properties:

Tensile strength (MPa): 655 - 1650 (depending on heat treatment)
Yield strength (MPa): 417.1
Hardness (HV): 210 - 350 (pre-stressed condition)
Density (g/cm³): 7.7 – 8.03
Elongation at break (%): 25.7
Impact toughness (J): 54.5

Influence of Alloying Elements:

Chromium (Cr): Enhances corrosion resistance, hardness, and wear resistance. Chromium carbides, such as Cr7C3 and Cr23C6, allow for deeper hardening.
Molybdenum (Mo): Improves toughness and strength, particularly after tempering.

Heat Treatment of 42CrMo4

The properties of 42CrMo4 can be significantly altered through heat treatment, depending on its intended use:

Hot forming: 850 - 1050 °C
Normalizing: 840 - 880 °C
Annealing: 680 - 720 °C
Quenching: 820 - 860 °C (water or oil cooling)

After quenching, a martensitic structure is formed, which can be further improved through tempering at approximately 315 °C. This enhances toughness, tensile strength, and weldability.

Applications of 42CrMo4

Due to its high strength, toughness, and hardenability, 42CrMo4 is particularly valued in the automotive and machinery industries. Typical applications include:

Transmission shafts
Piston rods
Gears
Crankshafts

What Are the Application Areas of 42CrMo4 (4140) Steel?

42CrMo4 (4140) is an alloyed quenched and tempered steel, highly valued for its chromium (Cr) and molybdenum (Mo) content. Through heat treatments such as hardening, this steel can develop a martensitic microstructure with high hardness and strength. At the same time, it offers an exceptional combination of toughness, ductility, and mechanical durability. These properties make 42CrMo4 one of the most versatile steels in the manufacturing industry, particularly in machining.

Typical applications include:

Machinery manufacturing: Shafts, axles, gears, and crankshafts.
Automotive industry: Suspension parts, engine components, and spring elements.
Aerospace: Aircraft components and turbine engines.
Construction: Structural components with high strength requirements.
Other applications: Brake rings, springs, ship anchor chains, cold-drawn materials, and starter gears.

What Differentiates 42CrMo4 from 42CrMoS4?

The main difference lies in their chemical composition, particularly in the sulfur (S) content:

42CrMo4:

Carbon (C): 0.38–0.45%
Silicon (Si): 0.15–0.40%
Manganese (Mn): 0.50–0.80%
Chromium (Cr): 0.90–1.20%
Molybdenum (Mo): 0.15–0.30%
Sulfur (S): max. 0.035%

42CrMoS4:

Carbon (C): 0.38–0.45%
Silicon (Si): up to 0.40%
Manganese (Mn): 0.60–0.90%
Chromium (Cr): 0.90–1.20%
Molybdenum (Mo): 0.15–0.30%
Sulfur (S): 0.02–0.04%

With its higher sulfur content, 42CrMoS4 has better machinability, making it particularly suitable for producing complex parts in machining processes.

What Makes Quenched and Tempered Steel Special?

Quenched and tempered steels like 42CrMo4 are characterized by a unique combination of hardness, toughness, and formability. Thanks to their high strength and hardness, they are ideal for large, thick-walled components. Additionally, quenched and tempered steels can be optimized for specific requirements through additional processes such as induction or flame hardening.

Main Groups and Properties of Quenched and Tempered Steels

Quenched and tempered steels are classified into four main groups based on their chemical composition:

Unalloyed quenched and tempered steels
Manganese-alloyed quenched and tempered steels
Chromium-alloyed quenched and tempered steels
Chromium-molybdenum-alloyed quenched and tempered steels

The Relationship Between Carbon Content and Quenching Strength in Unalloyed Steels
In unalloyed steels, quenching strength increases with carbon content.

For diameters up to 16 mm, the minimum yield strength ranges between 370 N/mm² (for 0.25% C) and 570 N/mm² (for 0.50% C).
For diameters between 16 mm and 40 mm, the yield strength is reduced by 50-80 N/mm².

Manganese-Alloyed Quenched and Tempered Steels

Manganese significantly enhances the hardenability of steels.

In steels like 30Mn4 and 40Mn4, the yield strength exhibits similar properties to C60 steel.

Chromium-Alloyed Quenched and Tempered Steels

Chromium improves both hardenability and ductility significantly.

For example, 40Cr4 steel achieves a minimum yield strength of 700 N/mm² for diameters ranging between 16 mm and 40 mm.

Chromium-Molybdenum-Alloyed Quenched and Tempered Steels

Molybdenum enhances hardenability even more than chromium and improves tempering resistance. It reduces the risk of temper brittleness and increases fatigue strength.

Why Choose Hasçelik?

Hasçelik offers 42CrMo4 and 42CrMoS4 steels of the highest quality. Visit our website to explore our product range and find the materials best suited to your requirements.

Material Number	DIN	SAE / AISI	C (%)	Si max (%)	Mn (%)	P max (%)	S max (%)	Cr (%)	Mo (%)	Ni (%)	V (%)
1.0402	C 22	1020	0,18-0,25	0,4	0,30-0,60	0,045	0,045	-	-	-	-
1.0501	C 35	1035	0,32-0,39	0,4	0,50-0,80	0,045	0,045	-	-	-	-
1.0503	C 45	1045	0,42-0,50	0,4	0,50-0,80	0,045	0,045	-	-	-	-
1.0535	C 55	1055	0,52-0,60	0,4	0,60-0,90	0,045	0,045	-	-	-	-
1.0601	C 60	1060	0,57-0,65	0,4	0,60-0,90	0,045	0,045	-	-	-	-
1.1151	Ck 22	1020/1023	0,18-0,25	0,4	0,30-0,60	0,035	0,035	-	-	-	-
1.1180	Cm 35	1035	0,32-0,49	0,4	0,50-0,80	0,035	0,020-0,035	-	-	-	-
1.1181	Ck 35	1035	0,32-0,39	0,4	0,50-0,80	0,035	0,035	-	-	-	-
1.1186	Ck 40	1040	0,37-0,44	0,4	0,50-0,80	0,035	0,035	-	-	-	-
1.1191	Ck 45	1045	0,42-0,50	0,4	0,50-0,80	0,035	0,035	-	-	-	-
1.1201	Cm 45	1045	0,42-0,50	0,4	0,50-0,80	0,035	0,020-0,035	-	-	-	-
1.1203	Ck 55	1055	0,52-0,60	0,4	0,60-0,90	0,035	0,035	-	-	-	-
1.1206	Ck 50	1050	0,45-0,55	0,4	0,60-0,90	0,035	0,035	-	-	-	-
1.1209	Cm 55	1055	0,52-0,60	0,4	0,60-0,90	0,035	0,020-0,035	-	-	-	-
1.1221	Ck 60	1060	0,57-0,65	0,4	0,60-0,90	0,035	0,035	-	-	-	-
1.1223	Cm 60	-	0,57-0,65	0,4	0,60-0,90	0,035	0,020-0,035	-	-	-	-
1.5038	40 Mn 4	1039	0,36-0,44	0,25-0,50	0,80-1,10	0,035	0,035	-	-	-	-
1.5065	28 Mn 6	1330	0,25-0,32	0,4	1,30-1,65	0,035	0,035	-	-	-	-
1.6511	36 CrNiMo 4	9840	0,32-0,40	0,4	0,50-0,80	0,035	0,035	0,90-1,20	0,15-0,30	0,90-1,20	-
1.6580	30 CrNiMo 8	-	0,26-0,33	0,4	0,40-0,70	0,035	0,035	1,40-1,70	0,30-0,50	1,80-2,20	-
1.6582	34 CrNiMo 6	4340	0,30-0,38	0,4	0,30-0,60	0,035	0,035	1,80-2,20	0,15-0,30	1,40-1,70	-
1.7003	38 Cr 2	-	0,34-0,41	0,4	0,50-0,80	0,035	0,035	0,40-0,60	-	-	-
1.7006	46 Cr 2	5045	0,42-0,50	0,4	0,50-0,80	0,035	0,035	0,40-0,60	-	-	-
1.7033	34 Cr 4	5132	0,30-0,37	0,4	0,60-0,90	0,035	0,035	0,90-1,20	-	-	-
1.7034	37 Cr 4	5135	0,34-0,41	0,4	0,60-0,90	0,035	0,035	0,90-1,20	-	-	-
1.7035	41 Cr 4	5140	0,38-0,45	0,4	0,60-0,90	0,035	0,035	0,90-1,20	-	-	-
1.7037	34 CrS 4	-	0,30-0,37	0,4	0,60-0,90	0,035	0,020-0,035	0,90-1,20	-	-	-
1.7038	37 CrS 4	-	0,34-0,41	0,4	0,60-0,90	0,035	0,020-0,035	0,90-1,20	-	-	-
1.7039	41 CrS 4	-	0,38-0,45	0,4	0,50-0,80	0,035	0,020-0,035	0,90-1,20	-	-	-
1.7218	25 CrMo 4	4130	0,22-0,29	0,4	0,50-0,80	0,035	0,035	0,90-1,20	0,15-0,30	-	-
1.7220	34 CrMo 4	4135;4137	0,30-0,37	0,4	0,50-0,80	0,035	0,035	0,90-1,20	0,15-0,30	-	-
1.7225	42 CrMo 4	4140	0,38-0,45	0,4	0,50-0,80	0,035	0,035	0,90-1,20	0,15-0,30	-	-
1.7226	34 CrMoS 4	-	0,30-0,37	0,4	0,50-0,80	0,035	0,020-0,035	0,90-1,20	0,15-0,30	-	-
1.7227	42 CrMoS 4	-	0,38-0,45	0,4	0,50-0,80	0,035	0,020-0,035	0,90-1,20	0,15-0,30	-	-
1.7228	50 CrMo 4	4150	0,46-0,51	0,4	0,50-0,80	0,035	0,035	0,90-1,20	0,15-0,30	-	-
1.7361	32 CrMo12 4	-	0,28-0,35	0,4	0,40-0,70	0,035	0,035	2,80-3,30	0,30-0,50	0,3	-
1.7707	30 CrMoV 9	-	0,26-0,34	0,4	0,40-0,70	0,035	0,035	2,30-2,70	-	-	0,10-0,20
1.8159	50 CrV 4	6150	0,47-0,55	0,4	0,70-1,10	0,035	0,035	0,90-1,20	-	-	0,10-0,20

Mechanical Properties of Annealed Steel

Material Number	DIN	SAE / AISI	Yield Strength (Re) Mpa				Tensile Strength (Rm) Mpa				Elongation at Fracture (A) L0=5 D0				Reduction of Area (Z) %
			Yield Strength (Re) Mpa				Tensile Strength (Rm) Mpa				Elongation at Fracture (A) L0=5 D0				Reduction of Area (Z) %
			16 MM	>16-40 MM	>40-100 MM	>100-160 MM	16 MM	>16-40 MM	>40-100 MM	>100-160 MM	16 MM	>16-40 MM	>40-100 MM	>100-160 MM	16 MM	>16-40 MM	>40-100 MM	>100-160 MM
1.0402	C 22	1020	350	300			550-700	500-650			20	22			40	45
1.0501	C 35	1035	430	370	320		630-780	600-750	550-700		17	19	20		35	40	45
1.0503	C 45	1045	500	430	370		700-850	650-800	630-780		14	16	17		30	35	40
1.0535	C 55	1055	550	500	430		800-950	750-900	700-850		12	14	15		25	30	35
1.0601	C 60	1060	580	520	450		850-1000	800-950	750-900		11	13	14		20	25	30
1.1151	Ck 22	1020/1023	350	300			550-700	500-650			20	22			50	50
1.1180	Cm 35	1035	430	370	320		630-780	600-750	550-700		17	19	20		40	45	50
1.1181	Ck 35	1035	430	370	320		630-780	600-750	550-700		17	19	20		35	40	45
1.1191	Ck 45	1045	500	430	370		700-850	650-800	630-780		14	16	17		35	40	45
1.1201	Cm 45	1045	500	430	370		700-850	650-800	630-780		14	16	17		35	40	45
1.1203	Ck 55	1055	550	500	430		800-950	750-900	700-850		12	14	15		30	35	40
1.1209	Cm 55	1055	550	500	430		800-950	750-900	700-850		12	14	15		30	35	40
1.1221	Ck 60	1060	580	520	450		850-1000	800-950	750-900		11	13	14		25	30	35
1.1223	Cm 60	-	580	520	450		850-1000	800-950	750-900		11	13	14		25	30	35
1.5038	40 Mn 4	1039	635	540	440		880-1080	780-930	690-830		12	14	15		40	45	50
1.5065	28 Mn 6	1330	590	490	440		780-930	690-840	640-790		13	15	16		40	45	50
1.6511	36 CrNiMo 4	9840	900	800	700	600	1100-1300	1100-1200	900-1000	800-950	10	11	12	13	45	50	55	60
1.6580	30 CrNiMo 8	-	1050	1050	900	800	1250-1450	1250-1450	1100-1300	1000-1200	9	9	10	11	40	40	45	50
1.6582	34 CrNiMo 6	4340	1000	900	800	700	1200-1400	1100-1300	1000-1200	900-1100	9	10	11	12	40	45	50	55
1.7003	38 Cr 2	-	550	450	350		800-950	700-850	600-750		14	15	17		35	40	45
1.7006	46 Cr 2	5045	650	550	400		900-1100	800-950	650-800		11	14	15		35	40	45
1.7033	34 Cr 4	5132	700	590	460		900-1100	800-950	700-850		11	13	14		35	40	45
1.7034	37 Cr 4	5135	750	630	510		950-1150	850-1000	750-900		11	13	14		35	40	45
1.7035	41 Cr 4	5140	800	660	560		1100-1200	900-1100	800-950		10	12	14		30	35	40
1.7037	34 CrS 4	-	700	590	460		900-1100	800-950	700-850		11	13	14		35	40	45
1.7038	37 CrS 4	-	750	630	510		950-1150	850-1000	750-900		11	13	14		35	40	45
1.7039	41 CrS 4	-	800	660	560		1100-1200	900-1100	800-950		10	12	14		30	35	40
1.7218	25 CrMo 4	4130	700	600	450	400	900-1100	850-950	700-800	650-800	12	14	15	16	50	55	60	60
1.7220	34 CrMo 4	4135-4137	800	650	550	500	1000-1200	900-1000	800-950	750-900	11	12	14	15	45	50	55	55
1.7225	42 CrMo 4	4140	900	750	650	550	1100-1300	1100-1200	900-1100	800-950	10	11	12	13	40	45	50	50
1.7226	34 CrMoS 4	-	800	650	550	500	1100-1200	900-1100	800-950	750-900	11	12	14	15	45	50	55	55
1.7227	42 CrMoS 4	-	900	750	650	550	1100-1300	1000-1200	900-1100	800-950	10	11	12	13	40	45	50	50
1.7228	50 CrMo 4	4150	900	780	700	650	1100-1300	1000-1300	900-1100	800-1000	9	10	12	13	40	45	50	50
1.7361	32 CrMo12 4	-	1030	1030	885	785	1230-1420	1230-1420	1080-1270	980-1180	9	9	10	11	35	35	40	45
1.7707	30 CrMoV 9	-	1050	1020	900	800	1250-1450	1200-1450	1100-1300	1000-1200	9	9	10	11	35	35	40	45
1.8159	50 CrV 4	6150	900	800	700	650	1100-1300	1000-1200	900-1100	850-1000	9	10	12	13	40	45	50	50

Material Number	DIN	SAE / AISI	Fields of Application
1.0402	C 22	1020	Parts for vehicles, machines, engines, and apparatus with low load
1.0501	C 35	1035	Parts for machines, apparatus, and vehicles with moderate load
1.0503	C 45	1045	Parts for vehicles, engines, machines, and apparatus with high load, such as shafts and gears
1.0535	C 55	1055	Parts for machines, vehicles, and engines, such as shafts and gears, under heavy load
1.0601	C 60	1060	Parts for machines and vehicles, such as shafts, axles, and bolts, under heavy load
1.1151	Ck 22	1020 / 1023	Parts for vehicles, machines, engines, and apparatus made of high distortion-resistant steel with low load
1.1180	Cm 35	1035	Parts for machines, vehicles, engines, and apparatus that are heavily machined
1.1181	Ck 35	1035	Parts for machines, vehicles, and engines with high load and high strength
1.1186	Ck 40	1040	Parts for vehicles, machines, engines, and apparatus with medium load and high strength
1.1191	Ck 45	1045	Parts for vehicles, machines, engines, and apparatus with medium load and high strength
1.1201	Cm 45	1045	Parts for machines, vehicles, engines, and apparatus with medium load that are machined
1.1203	Ck 55	1055	Parts for machines, vehicles, engines, and apparatus under heavy load that are machined
1.1206	Ck 50	1050	Parts for machines, vehicles, engines, and apparatus under heavy load that are machined
1.1209	Cm 55	1055	Parts for machines, vehicles, and engines under heavy load that are machined
1.1221	Ck 60	1060	Parts for machines, vehicles, and engines under heavy load and high strength
1.1223	Cm 60	-	Parts for machines, vehicles, and engines under heavy load that are machined
1.5038	40 Mn 4	1039	General machine and vehicle parts made of Mn-alloyed quenched and tempered steel
1.5065	28 Mn 6	1330	General machine and vehicle parts made of Mn-alloyed quenched and tempered steel
1.6511	36 CrNiMo 4	9840	Parts for vehicles and engines, such as axles, axle housings, crankshafts, wheel hubs, under very high load
1.6580	30 CrNiMo 8	-	Parts for automobiles and engines, with high strength, toughness, and elasticity, under heavy load
1.6582	34 CrNiMo 6	4340	Parts for automobiles and engines, such as crankshafts and other drive components, under very high load
1.7003	38 Cr 2	-	General parts for vehicle and engine construction
1.7006	46 Cr 2	5045	General parts for vehicle and engine construction
1.7033	34 Cr 4	5132	Parts for vehicles and machines, such as crankshafts and other drive components
1.7034	37 Cr 4	5135	Parts for transmissions, piston rods, crankshafts, and gears, hardened in cyanide bath
1.7035	41 Cr 4	5140	Parts for vehicles and engines, such as crankshafts, axles, axle housings, steering shafts, and similar components
1.7037	34 CrS 4	-	Parts for transmissions, shafts, piston rods made of machinable quenched and tempered steel
1.7038	37 CrS 4	-	Parts like 1.7037, additionally hardened in cyanide bath
1.7039	41 CrS 4	-	Parts like 1.7037, additionally hardened in cyanide bath
1.7218	25 CrMo 4	4130	Parts for automobiles and vehicles, such as axles, axle housings, turbine components, and turbine blades
1.7220	34 CrMo 4	4135-4137	Parts for automobiles and airplanes, such as crankshafts, axles, axle housings, shafts with high toughness
1.7225	42 CrMo 4	4140	Parts like 1.7220, including gears
1.7226	34 CrMoS 4	-	Parts like 1.7220 (better machinable)
1.7227	42 CrMoS 4	-	Parts like 1.7220 (better machinable)
1.7228	50 CrMo 4	4150	Parts for automobiles and airplanes, such as transmission, steering, and drive components, with high toughness
1.7361	32 CrMo12 4	-	Parts with high requirements for strength, toughness, and elasticity
1.7707	30 CrMoV 9	-	Parts for automobiles and vehicles with high toughness, such as crankshafts, bolts, screws, under very heavy load
1.8159	50 CrV 4	6150	Parts for automobiles and various mechanisms, such as gears, shafts, steering components, heavily worn