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Material data sheet

Steel grade

Last revised: Thu, 23 Feb 2023 16:19:46 GMT

General Information

51CrV4 is a high strength quench and tempering steel suitable for quenched and tempered springs. What Ovako offer includes a number of variants with tight chemical composition, suitable for different applications and material thicknesses. They all meet the overall requirements set by EN10089.


Variant SB4292 is a strong variant with hardenability in the upper part of the +HH band and low content of non-metallic inclusions.

Variant SB4290 has somewhat lower hardenability, but is still strong.                                                                                                           

Variant SB4282 has medium hardenability and is a good start for applications with normal requirements.                                                  

Variant SB4212 which has a good surface hardness, but it will not through harden for thicker dimensions. It is instead a good pick for thin sections.

Variants Ovako 593B and 593Q are also mainly used for springs, but frequently used for shafts and machine components.

Ovako 593Q is an IQ (isotropic quality) variant.



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

Similar designations

1.8159, 735A51, SS2230, SB4292 - 52CrMn5-4, SB4290 - 52CrMn5-4, SB4282 - 52CrMn4-4, SB4212- 50CrMn4-4, AISI 6150

Impact tests in +QT normally performed on U-notched samples.

The reference treatment for 51CrV4 EN10089:2002 is quench from 850 °C followed by tempering at 450 °C




593B: Average value with +/- standard deviation.

Steel cleanliness

Micro inclusions - 593B   Macro inclusions - 593B 
Applied standard ASTM  45   Applied standard  

ISO 3763 (Blue fracture)

 Statistical testing on billets
Sampling ASTM  A295   Sampling
Maximum average limits       A       B       C       D   Limits < 5 mm/dm2
Th He Th He Th He Th He  
2.5 1.5 1.5 0.5 0 0 1.0 0.5  
Micro inclusions - IQ - 593Q   Macro inclusions - IQ - 593Q
Applied standard DIN 50602  K1   Applied standard

ISO 3763

(Blue fracture)

10 M Hz UST

(Ovako internal procedure)

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


< 1mm


<5 defects /dm3

> 0.2 mm FBH


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.