34CrNiMo6

General Information

34CrNiMo6 is a quenching and tempering steel with high strength, high toughness and good hardenability. Used for large axles, machine components, tools and high strength fasteners.

The steel can be induction hardened and it is weldable under certain conditions. Through hardenability to appr. 100 mm diameter bar with oil quenching.

356D - Standard steel variant

356Q - IQ (isotropic quality) variant.

6499 - low sulphur variant of 34CrNiMo6

6507 - M-steel variant of 34CrNiMo6

IQ-Steel^®

IQ-Steel® is an isotropic quality ultra clean steel optimized for high fatigue strength under multi axial loading.

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

IQ-Steel^®

IQ-Steel® is an isotropic quality ultra clean steel optimized for high fatigue strength under multi axial loading.

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

34CrNiMo6M, SS2541, MoCN315, MoCN315M, 1.6582, 35NCD6, 816M40, 817M40, 35NiCrMo6, SNCM447, 30Ch2N2MA, F.1272, 40NiCrMo7, 4337, 4340, 92541, VSQT34CrNiMo6, VSQT34CrNiMo6/700, VSQT34CrNiMo6/800, VSQT34CrNiMo6/900, SS2541, EN24, 1.6582, EN 10083-3, SS142541

Variant	Cast	Di		C %	Si %	Mn %	P %	S %	Cr %	Ni %	Mo %	V %	Al %
356D	IC		Min	0.32	0.20	0.70	-	0.020	1.35	1.30	0.20	-	-
Max	0.38	0.35	0.80	0.025	0.030	1.60	1.60	0.30	0.100	-
356Q	IC		Min	0.32	0.15	0.65	-	-	1.30	1.30	0.20	-	-
Max	0.38	0.35	0.80	0.025	0.002	1.60	1.60	0.30	0.100	-
6499	CC	8.81	Min	0.30	0.15	0.50	-	-	1.40	1.40	0.15	-	-
Max	0.38	0.40	0.80	0.015	0.015	1.70	1.70	0.30	-	-
6502, MoCN 315 M	CC		Min	0.30	-	0.50	-	0.015	1.30	1.30	0.15	-	-
Max	0.38	0.40	0.80	0.025	0.035	1.70	1.70	0.30	-	-
SS 2541 (6498)	CC	7.91	Min	0.32	0.10	0.50	-	0.020	1.30	1.30	0.15	-	-
Max	0.39	0.40	0.80	0.035	0.035	1.70	1.70	0.30	-	-
SB9205	CC		Min	0.36	0.15	0.50	0.000	0.000	1.30	1.30	0.20	-	0.015
Max	0.38	0.40	0.70	0.025	0.012	1.40	1.70	0.30	-	0.040
34CrNiMo6 EN ISO 683-2	Std		Min	0.30	0.10	0.50	0.000	0.000	1.30	1.30	0.15	-	-
Max	0.38	0.40	0.80	0.025	0.035	1.70	1.70	0.30	-	-

Variant

Cast

C %

Si %

Mn %

P %

S %

Cr %

Ni %

Mo %

V %

Al %

356D

Min

0.32

0.20

0.70

0.020

1.35

1.30

0.20

Max

0.38

0.35

0.80

0.025

0.030

1.60

0.30

0.100

356Q

Min

0.32

0.15

0.65

1.30

0.20

Max

0.38

0.35

0.80

0.025

0.002

1.60

0.30

0.100

6499

8.81

Min

0.30

0.15

0.50

1.40

0.15

Max

0.38

0.40

0.80

0.015

1.70

0.30

6502, MoCN 315 M

Min

0.30

0.50

0.015

1.30

0.15

Max

0.38

0.40

0.80

0.025

0.035

1.70

0.30

SS 2541 (6498)

7.91

Min

0.32

0.10

0.50

0.020

1.30

0.15

Max

0.39

0.40

0.80

0.035

1.70

0.30

SB9205

Min

0.36

0.15

0.50

0.000

1.30

0.20

0.015

Max

0.38

0.40

0.70

0.025

0.012

1.40

1.70

0.30

0.040

34CrNiMo6 EN ISO 683-2

Std

Min

0.30

0.10

0.50

0.000

1.30

0.15

Max

0.38

0.40

0.80

0.025

0.035

1.70

0.30

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
356D	+SA	Round bar	< 190	-	-	-	-	200 HB typical	-
+QT	Round bar	< 50	900	1000 typical	10	45	360 HB typical	20 °C 140 J (long)
Round bar	50 < 100	800	900 typical	10	45	330 HB typical	20 °C 115 J (long)
Round bar	100 < 200	700	800 typical	10	45	300 HB typical	-
Round bar	> 200	600	700 typical	10	45	270 HB typical	-
Round bar	< 150	-	-	-	-	285 HB typical	20 °C 90 J (long)
+Q	Round bar	< 100	1200	1500 typical	7	25	50 HRC typical	-
356Q	+SA	Round bar	< 190	-	-	-	-	200 HB typical	-
+QT	Round bar	< 50	900	1000 typical	10	45	360 HB typical	20 °C 140 J (long)
Round bar	50 < 100	800	900 typical	10	45	330 HB typical	20 °C 115 J (long)
Round bar	100 < 200	700	800 typical	10	45	300 HB typical	-
Round bar	> 200	600	700 typical	10	45	270 HB typical	-
Round bar	< 150	-	-	-	-	285 HB typical	20 °C 90 J (long)
+Q	Round bar	< 100	1200	1500 typical	7	25	50 HRC typical	-
6499	+AR	Round bar	25 < 160	-	-	-	-	< 380 HB	-
+A	Round bar	25 < 160	-	-	-	-	< 248 HB	-
+QT	Round bar	25 < 40	900*	1100-1300	10	45	320-380 HB	20 °C 45 J (long)
Round bar	40 < 100	800*	1000-1200	11	50	300-350 HB	20 °C 45 J (long)
Round bar	100 < 160	700*	900-1100	12	55	270-320 HB	20 °C 45 J (long)
6502, MoCN 315 M	+AR	Round bar	25 < 160	-	-	-	-	< 380 HB	-
+A	Round bar	25 < 160	-	-	-	-	< 248 HB	-
+QT	Round bar	25 < 40	900*	1100-1300	10	45	320-380 HB	20 °C 45 J (long)
Round bar	40 < 100	800*	1000-1200	11	50	300-350 HB	20 °C 45 J (long)
Round bar	100 < 160	700*	900-1100	12	55	270-320 HB	20 °C 45 J (long)
SS 2541 (6498)	+AR	Round bar	25 < 160	-	-	-	-	< 380 HB	-
+A	Round bar	25 < 160	-	-	-	-	< 248 HB	-
+QT	Round bar	25 < 40	900*	1100-1300	10	45	320-380 HB	20 °C 45 J (long)
Round bar	40 < 100	800*	1000-1200	11	50	300-350 HB	20 °C 45 J (long)
Round bar	25 < 160	700*	900-1050	12	55	270-325 HB	-20 °C 27 J (long)

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

356D

+SA

Round bar

< 190

200 HB typical

+QT

Round bar

< 50

900

1000 typical

360 HB typical

20 °C 140 J (long)

Round bar

50 < 100

800

900 typical

330 HB typical

20 °C 115 J (long)

Round bar

100 < 200

700

800 typical

300 HB typical

Round bar

> 200

600

700 typical

270 HB typical

Round bar

< 150

285 HB typical

20 °C 90 J (long)

Round bar

< 100

1200

1500 typical

50 HRC typical

356Q

+SA

Round bar

< 190

200 HB typical

+QT

Round bar

< 50

900

1000 typical

360 HB typical

20 °C 140 J (long)

Round bar

50 < 100

800

900 typical

330 HB typical

20 °C 115 J (long)

Round bar

100 < 200

700

800 typical

300 HB typical

Round bar

> 200

600

700 typical

270 HB typical

Round bar

< 150

285 HB typical

20 °C 90 J (long)

Round bar

< 100

1200

1500 typical

50 HRC typical

6499

+AR

Round bar

25 < 160

< 380 HB

Round bar

25 < 160

< 248 HB

+QT

Round bar

25 < 40

900*

1100-1300

320-380 HB

20 °C 45 J (long)

Round bar

40 < 100

800*

1000-1200

300-350 HB

20 °C 45 J (long)

Round bar

100 < 160

700*

900-1100

270-320 HB

20 °C 45 J (long)

6502, MoCN 315 M

+AR

Round bar

25 < 160

< 380 HB

Round bar

25 < 160

< 248 HB

+QT

Round bar

25 < 40

900*

1100-1300

320-380 HB

20 °C 45 J (long)

Round bar

40 < 100

800*

1000-1200

300-350 HB

20 °C 45 J (long)

Round bar

100 < 160

700*

900-1100

270-320 HB

20 °C 45 J (long)

SS 2541 (6498)

+AR

Round bar

25 < 160

< 380 HB

Round bar

25 < 160

< 248 HB

+QT

Round bar

25 < 40

900*

1100-1300

320-380 HB

20 °C 45 J (long)

Round bar

40 < 100

800*

1000-1200

300-350 HB

20 °C 45 J (long)

Round bar

25 < 160

700*

900-1050

270-325 HB

-20 °C 27 J (long)

	Temperature °C
MS	315
AC1	725
AC3	785

Temperature °C

315

AC1

725

AC3

785

Treatment	Condition	Temperature cycle	Cooling/quenching
Hot forging	+AR	880-1050^oC	In air
Soft annealing	+A	650-700^oC	Slowly (15^oC/h) until 600^oC
Stress relieve annealing	+SRA	450-650^oC (appr. 50^oC under tempering temperature)	In air
Hardening	+Q	820-850^oC	Quenching in oil
Tempering	+T	540-680^oC	In air

Treatment

Condition

Temperature cycle

Cooling/quenching

Hot forging

+AR

880-1050^oC

In air

Soft annealing

650-700^oC

Slowly (15^oC/h) until 600^oC

Stress relieve annealing

+SRA

450-650^oC (appr. 50^oC under tempering temperature)

In air

Hardening

820-850^oC

Quenching in oil

Tempering

540-680^oC

In air

Micro inclusions - Ovako356D		Macro inclusions - Ovako356D
Applied standard	ASTM E45	Applied standard	ISO 3763 (Blue fracture)
Sampling	ASTM A295	Sampling	Statistical testing on billets
Maximum average limits	A	B	C	D	Limits	< 5 mm/dm²
Th	He	Th	He	Th	He	Th	He
2.0	1.5	0.8	0.1	0	0	0.5	0.4

Micro inclusions - Ovako356D

Macro inclusions - Ovako356D

Applied standard

ASTM E45

Applied standard

ISO 3763

(Blue fracture)

Sampling

ASTM A295

Sampling

Statistical testing on billets

Maximum

average

limits

Limits

< 5 mm/dm²

2.0

1.5

0.8

0.1

0.5

0.4

Micro inclusions - Ovako356Q		Macro inclusions - Ovako356Q
Applied standard	DIN 50602 K1	Applied standard	10 M Hz UST (Ovako internal standard)
Sampling	Six random samples from final product dimension	Sampling	Statistical testing on billets
Limits	The limit is dimension dependent. The average rating of six samples should not exceed the limits given in the graph	Limits	< 10 defects/dm3 > 0,2 mm FBH

Micro inclusions - Ovako356Q

Macro inclusions - Ovako356Q

Applied standard

DIN 50602 K1

Applied standard

10 M Hz UST

(Ovako internal standard)

Sampling

Six random samples from final product dimension

Sampling

Statistical testing on billets

Limits

The limit is dimension dependent. The average rating of six samples

should not exceed the limits given in the graph

Limits

< 10 defects/dm3

> 0,2 mm FBH

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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Material data sheet

Steel grade

34CrNiMo6

General Information

Similar designations

Chemical composition

Mechanical Properties

Transformation temperatures

Heat treatment recommendations

Heat Treatment Guide generated Graphs

Hardenability

CCT - Ovako356D and Ovako356Q

Tempering response - Ovako356D and Ovako356Q

Steel cleanliness

Steel cleanliness

IQ

Machinability

Tensile strength at elevated temperatures - Ovako356D

Other properties (typical values)

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