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Material data sheet

Steel grade

  • Ovako356D
  • Ovako356Q
  • 6499
  • MoCN 315 M
  • 6498
  • SB9205
Last revised: Thu, 17 Sep 2020 15:20:57 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

6507  -  M-steel variant of 34CrNiMo6



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, 356, 356D, SS2541, MoCN315, MoCN315M, 1.6582, 35NCD6, 816M40, 817M40, 35NiCrMo6, SNCM447, 30Ch2N2MA, F.1272, 40NiCrMo7, 4337, 4340, 92541, VSQT34CrNiMo6, VSQT34CrNiMo6/700, VSQT34CrNiMo6/800, VSQT34CrNiMo6/900, Stål 2541, Steel 2541, EN24

*SS 142541(1986) All formats condition +QT: Dim <180mm corresponds to SS2541-03; Dim<100mm corresponds to SS2541-05; Dim<40mm corresponds to SS2541-04; All formats condition +A corresponds to SS2541-02

Jominy hardenability of Ovako 356D. Valid also for Ovako 356Q.   Average value with +/-standard deviation.  The reference 34CrNiMo6 EN10083-3:2006 (ref) shows the range "+HL" minimum to "+HH" maximum.  

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.