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Material data sheet

Steel grade

Last revised: Fri, 16 Jun 2023 14:05:22 GMT

General Information

100Cr6 is a through hardening bearing steels intended for rolling contact and other high fatigue applications. In the hardened condition the high hardness, high strength and high cleanliness provides the steel with the right properties to withstand high cycle, high stress fatigue. 100Cr6 is mainly used for small and medium sized bearing components. It is also regularly used for other machine components that require high tensile strength and high hardness. The hardenability approximately corresponds to a ring with max. 17 mm wall thickness.

This steel is delivered in a number of variants. The most common are listed below.

803Q  -  Isotropic properties and better fatigue strength due to higher cleanliness levels, and a finer size and distribution of non-metallic inclusions (IQ)

803Z  -  Improved cold forming properties due to the reduced silicon content (BQ)

803D  -  Improved machinability due to the higher sulphur content. 

803P  -   With a reduced sulphur content to reduce the number of sulphide inclusions (BQ)
803A  -  With a reduced controlled sulphur content to reduce the number of sulphide inclusions but ensure consistent machinability (BQ)
803F  -   With a controlled sulphur content for consistent machining properties (BQ)
803N  -   Slightly increased carbon range to meet the requirements of some international standards (BQ)
803J   -   Standard (BQ)

5620 / 802F -  A continuous cast variant of 100Cr6 (BQ)


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

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

SS 2258, SAE 52100, 1.3505 , 100 Cr 6 , SUJ2S, SUJ2Z, 100C6, GCr15, B00150

ISO 683-17 display the chemical composition according to the standard.


CCT data

Tempering response

Steel cleanliness

Micro inclusions - IC   Macro inclusions - IC
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


Fatigue properties

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.