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Material data sheet

Steel grade

Last revised: Thu, 23 Feb 2023 16:20:01 GMT

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 Suitable for fasteners according to ISO 898 Grade 10.9 up to 90 mm bar diameter

6498 - A variant of the old swedish standard SS 2541

6502  -  M-steel variant of 34CrNiMo6

SB9205 - A variant of 34CrNiMo6


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


The basis for the concept is that non-metallic inclusions are modified and controlled with calcium treatment in a way to minimize tool wear and to maximize chip control in machining operations. Our M-Steel treatment can be applied to any steel grade. 

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

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




A B C D Limits < 5 mm/dm2
Th He Th He Th He Th He









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

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

should not exceed the limits given in the graph


< 10 defects/dm3

> 0,2 mm FBH



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

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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.