42CrMo4

General Information

42CrMo4 is a steel for quenching and tempering, which has a good combination of strength and toughness in the quenched and tempered condition. After the oil quenching, the steel will be through hardened up to ø60 mm bar diameter. The microstructure of larger dimensions is not fully martensite. The steel is applicable to induction hardening. The surface hardness will exceed min. 53 HRC. 42CrMo4 can be delivered M-treated in order to optimize the machinability.

Variant 6082 is offered under the name MoC410M

Variant 6137 conform with L7 ASTM A320

Variant SB9288 is offered under the name SB42CrMo4

Variant SB9287 with a slightly increased hardenability, is offered under the name SB42CrMo4.

Variant 327S is a continuous cast variant with slightly increased hardenability, similar to the ingot casted variant 327A

Variant 327A is an ingot cast variant with slightly increased hardenability.

Variant 326C is a BQ-steel variant which fulfils SAE 4140 standard but has a restricted sulphur content for improved cleanliness and a lower maximum allowed phosphorus content for improved mechanical properties

BQ-Steel®

BQ-steel® is a bearing quality clean steel optimized for fatigue strength and is also ideal for new design solutions outside the bearing industry.

For additional Heat Treatment Data, please visit the Heat Treatment Guide.

M-Steel^®
The concept: Our M-Steel treatment can be applied to any steel grade. The basis for the concept is that non-metallic inclusions are modified and controlled with calcium treatment. These inclusions are modified in a way to maximize machinability and to improve transverse fatigue strength. In this way, a protective layer is formed on the cutting tool during machining that very significantly reduces the wear on the tool and increases the tool life. At every stage of the M-Steel production process the material is optimised to improve machinability, from raw material through melt, to casting, hot rolling and the final heat treatment. Individual delivery requirements can be met to supply your material in the best form for your machines in compliance with tight straightness and dimensional tolerances. M-Steel has a consistent machinability from cast to cast, meaning that machines can be run with fixed high cutting rates and predictable tool change intervals from one production run to another. Recent findings also show that the M-Steel effect is particularly pronounced in turning in very hard condition using Cubic Boron Nitride (CBN) inserts. Replacing traditional grinding of case- or induction-hardened surfaces with Hard Part Turning can mean very large cost savings, together with production lead time and quality improvements.

BQ-Steel^®

BQ-steel® is a bearing quality clean steel optimized for fatigue strength and is also ideal for new design solutions outside the bearing industry.

Similar designations

AISI 4140, 42CD4(AFNOR), 708M40(B.S.), SS 2244, SS142244, SAE 4140H, ASTM A193 B7, 41Cr4, 42CrMoS4, 1.7225

Variant	Cast	Di	Weldability		C %	Si %	Mn %	P %	S %	Cr %	Ni %	Mo %	V %	Cu %	Al %	B %	DI %
42CrMo4 M (6082), MoC 410 M	CC	5.6	CEV 0.82_max	Min	0.38	0.15	0.60	-	0.020	0.90	-	0.15	-	-	-	-	-
Pcm 0.55_max	Max	0.45	0.40	0.90	0.025	0.035	1.20	-	0.30	-	-	-	-	-
L7 ASTM A320 (6137)	CC	6.39	CEV 0.86_max	Min	0.38	0.15	0.75	-	-	0.90	-	0.15	-	-	-	-	-
Pcm 0.585_max	Max	0.45	0.35	0.90	0.025	0.025	1.10	-	0.25	-	-	-	0.0030	-
SB 9288	CC	4.9	CEV 0.8_max	Min	0.40	0.15	0.75	-	0.020	0.90	-	0.15	-	-	0.015	-	-
Pcm 0.57_max	Max	0.43	0.25	0.90	0.025	0.035	1.10	0.30	0.25	-	0.25	0.040	-	-
327S	CC		CEV _max	Min	0.41	0.20	0.65	-	0.020	1.00	0.15	0.22	-	-	0.020	-	-
Pcm _max	Max	0.45	0.35	0.80	0.025	0.030	1.20	0.30	0.28	0.040	-	0.035	-	-
327A	IC		CEV 0.92_max	Min	0.41	0.20	0.65	-	0.020	1.00	0.15	0.22	-	-	-	-	5.60
Pcm 0.6_max	Max	0.45	0.35	0.80	0.025	0.030	1.20	0.30	0.28	-	-	-	-	8.30
326C	IC		CEV 0.9_max	Min	0.38	0.20	0.80	-	0.005	0.90	-	0.15	-	-	-	-	-
Pcm 0.58_max	Max	0.43	0.30	1.00	0.015	0.010	1.10	0.20	0.25	-	-	-	-	-
42CrMo4 EN ISO 683-2	Std		CEV _max	Min	0.38	0.10	0.60	0.000	0.000	0.90	-	0.15	-	0.00	-	-	-
Pcm _max	Max	0.45	0.40	0.90	0.025	0.035	1.20	-	0.30	-	0.40	-	-	-

Variant

Cast

Weldability

C %

Si %

Mn %

P %

S %

Cr %

Ni %

Mo %

V %

Cu %

Al %

B %

DI %

42CrMo4 M (6082), MoC 410 M

5.6

CEV 0.82_max

Min

0.38

0.15

0.60

0.020

0.90

0.15

Pcm 0.55_max

Max

0.45

0.40

0.90

0.025

0.035

1.20

0.30

L7 ASTM A320 (6137)

6.39

CEV 0.86_max

Min

0.38

0.15

0.75

0.90

0.15

Pcm 0.585_max

Max

0.45

0.35

0.90

0.025

1.10

0.25

0.0030

SB 9288

4.9

CEV 0.8_max

Min

0.40

0.15

0.75

0.020

0.90

0.15

0.015

Pcm 0.57_max

Max

0.43

0.25

0.90

0.025

0.035

1.10

0.30

0.25

0.040

327S

CEV _max

Min

0.41

0.20

0.65

0.020

1.00

0.15

0.22

0.020

Pcm _max

Max

0.45

0.35

0.80

0.025

0.030

1.20

0.30

0.28

0.040

0.035

327A

CEV 0.92_max

Min

0.41

0.20

0.65

0.020

1.00

0.15

0.22

5.60

Pcm 0.6_max

Max

0.45

0.35

0.80

0.025

0.030

1.20

0.30

0.28

8.30

326C

CEV 0.9_max

Min

0.38

0.20

0.80

0.005

0.90

0.15

Pcm 0.58_max

Max

0.43

0.30

1.00

0.015

0.010

1.10

0.20

0.25

42CrMo4 EN ISO 683-2

Std

CEV _max

Min

0.38

0.10

0.60

0.000

0.90

0.15

0.00

Pcm _max

Max

0.45

0.40

0.90

0.025

0.035

1.20

0.30

0.40

Variant	Condition	Format	Dimension [mm]	Yield strength min [MPa]	Tensile strength [MPa]	Elongation A₅ [%]	Reduction of area Z_min [%]	Hardness	Impact (ISO-V) strength_min
Rp_0.2 * R_eh, ** R_el
42CrMo4 M (6082), MoC 410 M	+AR	Round bar	25 < 160	-	-	-	-	350 HB typical	-
+A	Round bar	25 < 160	-	-	-	-	241 HB typical	-
+QT	Round bar	25 < 40	750**	1000-1200	11	45	300-350 HB	20 °C 35 J (long)
Round bar	40 < 100	650**	900-1100	12	50	270-320 HB	20 °C 35 J (long)
Round bar	100 < 160	550**	800-950	13	50	240-280 HB	20 °C 35 J (long)
L7 ASTM A320 (6137)	+AR	Round bar	22 < 160	-	-	-	-	< 340 HB	-
+A	Round bar	22 < 160	-	-	-	-	< 241 HB	-
+QT	Round bar	22 < 90	725	860-1070	16	50	260-321 HB	-101 °C 27 J (long)
SB 9288	+QT	Round bar	15 < 64	940**	1050-1140	9	-	-	-
327A	+AR	Round bar	24 < 190	-	-	-	-	350 HB typical	-
+A	Round bar	24 < 190	-	-	-	-	241 HB typical	-
+QT	Round bar	25 < 40	750**	1000-1200	11	45	300-350 HB	20 °C 35 J (long)
Round bar	40 < 100	650**	900-1100	12	50	270-320 HB	20 °C 35 J (long)
Round bar	100 < 160	550**	800-950	13	50	240-280 HB	20 °C 35 J (long)
Round bar	160 < 180	500**	750-900	14	55	220-270 HB	20 °C 35 J (long)
326C	+A	Round bar	25 < 180	-	-	-	-	200 HB typical	-
+QT	Round bar	25 < 180	600	700-1050	17	65	230-330 HB	-

Variant

Condition

Format

Dimension [mm]

Yield strength min [MPa]

Tensile strength [MPa]

Elongation A₅ [%]

Reduction of area Z_min [%]

Hardness

Impact (ISO-V) strength_min

Rp_0.2 * R_eh, ** R_el

42CrMo4 M (6082), MoC 410 M

+AR

Round bar

25 < 160

350 HB typical

Round bar

25 < 160

241 HB typical

+QT

Round bar

25 < 40

750**

1000-1200

300-350 HB

20 °C 35 J (long)

Round bar

40 < 100

650**

900-1100

270-320 HB

20 °C 35 J (long)

Round bar

100 < 160

550**

800-950

240-280 HB

20 °C 35 J (long)

L7 ASTM A320 (6137)

+AR

Round bar

22 < 160

< 340 HB

Round bar

22 < 160

< 241 HB

+QT

Round bar

22 < 90

725

860-1070

260-321 HB

-101 °C 27 J (long)

SB 9288

+QT

Round bar

15 < 64

940**

1050-1140

327A

+AR

Round bar

24 < 190

350 HB typical

Round bar

24 < 190

241 HB typical

+QT

Round bar

25 < 40

750**

1000-1200

300-350 HB

20 °C 35 J (long)

Round bar

40 < 100

650**

900-1100

270-320 HB

20 °C 35 J (long)

Round bar

100 < 160

550**

800-950

240-280 HB

20 °C 35 J (long)

Round bar

160 < 180

500**

750-900

220-270 HB

20 °C 35 J (long)

326C

Round bar

25 < 180

200 HB typical

+QT

Round bar

25 < 180

600

700-1050

230-330 HB

	Temperature °C
MS	320
AC1	740
AC3	770

Temperature °C

320

AC1

740

AC3

770

Treatment	Condition	Temperature cycle	Cooling/quenching
Hot forging	+U	850-1050°C	In air
Soft annealing	+A	680-720°C	Slowly ( 15°C/h) until 600°C
Stress relieve annealing	+SRA	450-650°C	In air
Quench & Tempering	+QT	840-880°C	In oil or water. Temper in 540-680°C
Stress relieve annealing	+SRA	150-180°C ( after Induction Hardening )	In air

Treatment

Condition

Temperature cycle

Cooling/quenching

Hot forging

850-1050°C

In air

Soft annealing

680-720°C

Slowly ( 15°C/h) until 600°C

Stress relieve annealing

+SRA

450-650°C

In air

Quench & Tempering

+QT

840-880°C

In oil or water. Temper in 540-680°C

Stress relieve annealing

+SRA

150-180°C ( after Induction Hardening )

In air

Youngs module (GPa)	Poisson´s ratio (-)	Shear module (GPa)	Density (kg/m3)
210	0.3	80	7800
Average CTE 20-300°C (µm/m°K)	Specific heat capacity 50/100°C (J/kg°K)	Thermal conductivity Ambient temperature (W/m°K)	Electrical resistivityAmbient temperature (µΩm)
12	460 - 480	40 - 45	0.20 - 0.25

Youngs module (GPa)

Poisson´s ratio (-)

Shear module (GPa)

Density (kg/m3)

210

0.3

7800

Average CTE 20-300°C (µm/m°K)

Specific heat capacity 50/100°C (J/kg°K)

Thermal conductivity Ambient temperature (W/m°K)

Electrical resistivityAmbient temperature (µΩm)

460 - 480

40 - 45

0.20 - 0.25

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Steel grade

42CrMo4

General Information

Similar designations

Chemical composition

Mechanical Properties

Transformation temperatures

Heat treatment recommendations

Heat Treatment Guide generated Graphs

Hardenability

Other properties (typical values)

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