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    Material data sheet

    Steel grade

    • Ovako827
    Last revised: Thu, 03 Oct 2019 13:09:23 GMT

    General Information

    Ovako 827 is a through hardening bearing steel that is mainly used for medium sized bearing rings, but it can also be used for machine components that require high tensile strength, hardness and toughness.

    827B - Bearing quality (BQ) variant 

    • Through hardenability corresponding to a ring with approximately 75mm wall thickness (≈Ø130mm bar), quenched in oil
    • Suitable for martensitic or banitic hardening
    • Good machinability in soft annealed condition
    • Good dimensional stability

    For additional Heat Treatment Data, please visit the Heat Treatment Guide.

    (Bearing Quality) is a bearing quality clean steel optimized for fatigue strength by a strict control of steel cleanliness. BQ-steel is also ideal for new design solutions in a wide array of demanding applications outside the bearing industry that require longer performance and higher loads. The BQ-steel offer is the result of the Ovako clean steel program. Purity of production means that the material has significantly smaller inclusions compared to conventional steel and, as a result, the fatigue strength of the steel is increased dramatically. Use of the material allows components to be manufactured in smaller sizes. The BQ-steel  has for decades been the problem-solver.

    Similar designations

    A485 (B8)


    Bainite transformation

    Steel cleanliness

    Micro inclusions - Ovako 827B   Macro inclusions - Ovako 827B
    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 0,5 0,1 0 0 0,2  0,1 

    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.