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Last revised: Thu, 29 Oct 2020 11:13:51 GMT

34CrNiMo6

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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

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

Chemical composition

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	-	-
356D	IC		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	-	-
356Q	IC		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	-	-
6499	CC	8.81	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	-	-
6502, MoCN 315 M	CC		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	-	-
SS 2541 (6498)	CC	7.91	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
SB9205	CC		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	-	-
34CrNiMo6 EN ISO 683-2	Std		Max	0.38	0.40	0.80	0.025	0.035	1.70	1.70	0.30	-	-

Mechanical Properties

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)

Transformation temperatures

	Temperature °C
MS	315
AC1	725
AC3	785

Heat treatment recommendations

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

Hardenability

Jominy hardenability of Ovako 356D. Valid also for Ovako 356Q. Average value with +/-standard deviation.

CCT - Ovako356D and Ovako356Q

Tempering response - Ovako356D and Ovako356Q

Steel cleanliness

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

Steel cleanliness

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

IQ

Machinability

Tensile strength at elevated temperatures - Ovako356D

Other properties (typical values)

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

Contact us

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Via e-mail: info@ovako.com

Via telephone: +46 8 622 1300

For more detailed information please visit http://www.ovako.com/en/Contact-Ovako/

Disclaimer

The information in this document is for illustrative purposes only. The data and examples are only general recommendations and not a warranty or a guarantee. The suitability of a product for a specific application can be confirmed only by Ovako once given the actual conditions.The purchaser of an Ovako product has the responsibility to ascertain and control the applicability of the products before using them. Continuous development may necessitate changes in technical data without notice. This document is only valid for Ovako material. Other material, covering the same international specifications, does not necessarily comply with the properties presented in this document.

General information
Chemical composition
Mechanical properties
Transformation temp.
Heat treatment
Hardenability

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Steel grade

34CrNiMo6

General Information

Similar designations

Chemical composition

Mechanical Properties

Transformation temperatures

Heat treatment recommendations

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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