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Material data sheet

Steel grade

Last revised: Thu, 23 Feb 2023 16:19:37 GMT

General Information

Ovako 837 is a through hardening bearing steel that is mainly used for medium sized bearing rings, but can also be used for machine components that require high tensile strength and high hardness.

  • 30 mm maximum wall thickness for through hardening
  • Used for martensitic hardening
  • Can be induction hardened
  • Good machinability in soft annealed condition
  • Machinable in hardened condition using hard-turning techniques (CBN tools)
  • Very good dimension stability

837R - Bearing quality (BQ) variant

837S - Variant with a controlled high sulphur content for enhanced low speed machining

5625 / 837Z - A continous cast variant (BQ)

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

ASTM A485 grade B3, 100 CM 6

Tempering response

Steel cleanliness

Micro inclusions - Ovako 837R   Macro inclusions - Ovako 837R
Applied standard ASTM E45 Applied standard

ISO 3763

(Blue fracture)

Sampling ASTM A295 Sampling Statistical testing on billets

Maximum average


A B C D Limits < 2,5 mm/dm2
Th He Th He Th He Th He
2,0 1,5 0,8 0,1 0 0 0,5  0,3 

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.