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    Material data sheet

    Steel grade

    • Ovako825
    Last revised: Fri, 26 Jan 2018 10:55:11 GMT

    General Information

    Ovako 825 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.

    • Through hardenability corresponding to a ring with approximately 30mm wall thickness (≈Ø50mm bar), quenched in oil
    • Suitable for martensitic or banitic hardening
    • Good machinability in soft annealed condition
    • Good dimensional stability

    BQ-Steel®

    825B - Standard

    825T - With a controlled low sulphur content to minimize the number of sulphide inclusions. Reduced carbon content and tighter chemical      composition ranges 

    IQ-Steel® 

    825Q - Isotropic properties (IQ) and better fatigue strength due to higher cleanliness levels, and a finer size and distribution of non-metallic inclusions

     

    BQ-Steel® 
    (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.

    IQ-Steel® 
    (Isotropic Quality) is an isotropic quality ultra clean steel. IQ-Steel is optimized for fatigue strength by a strict control of steel cleanliness. IQ-Steel, a further development of BQ-Steel, is an isotropic and ultra clean steel with properties that match re-melted steels. Based on thousands of examinations by Ovako into the effects of defects on fatigue performance, the metallurgy of IQ-Steel is purer and far more consistent than conventional grades, and designed specifically to perform well in multi axial loading. This enables the manufacturing of lighter, slimmed down components like gears, bearings and other critical parts. The steels are helping our customers to achieve new design solutions and implement higher standards of finished product performance. Key to these practical advantages are Ovako’s own unique, clean and consistent modern steelmaking processes that remove harmful inclusions and impurities from within the steel. IQ-Steels contain smaller and more fragmented inclusions and can handle much higher mechanical forces in all directions than conventional steels. IQ-Steels are newer, but already now well established in high pressure automotive applications. Modern diesel engines, with high and cyclic injection pressures, have proven to be an ideal application. Transmission components are another emerging area of strong interest.

    Similar designations

    A485 (B6)

    CCT

    TTT

    Tempering response

    Steel cleanliness

    Micro inclusions - Ovako 825B   Macro inclusions - 825B
    Applied standard ASTM E45 Applied standard

    ISO 3763

    (Blue fracture)

    Sampling ASTM A295 Sampling Statistical testing on billets.

    Maximum

    average limits

    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
     
    Micro inclusions - IQ   Macro inclusions - IQ
    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
    Limits

    The limit is dimension dependent. The average rating of six samples should not exceed the

    limits given in the graph

    Limits < 1 mm/dm2

    < 5 defects/dm3 

    > 0,2 mm FBH 

    IQ

    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

    Contact us

    Would you like to know more about our offers? Don´t hesitate to contact us:

    Via e-mail: info@ovako.com 

    Via telephone: +46 8 622 1300

    For more detailed information please visit http://www.ovako.com/en/Contact-Ovako/

      

     

    Disclaimer

    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.