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    Steel Cleanliness and Bearing Life

    Published: 01 August 2012

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    It is well established that the life of a bearing depends on the microscopic cleanliness of the component in service. In recent years, the rating of microscopic cleanliness by the numerical-based extreme value analysis was introduced to characterize the complete heat, to test and finalize conclusions on the performance of bearings made from this heat. Naturally, the experience with this method and the connection to bearing life is very limited. Therefore, a test program was set up to test the applicability of this method by investigation of 100Cr6/SAE52100—heats from different suppliers. In this investigation program, different quality levels were rated against the extreme value analysis. Each inclusion type was rated separately. In a next step, over rolling tests were done under full lubrication with contact pressures between 2200 and 4800 MPa to evaluate a possible connection between the extreme values or other cleanliness features and bearing life as a function of load. This paper reports the results of this test program.


    cleanliness, bearing steel, inclusion, maximum inclusion size value, over rolling fatigue

    Author Information:

    Trojahn, Werner
    Schaeffler Technologies GmbH & Co. KG, Schweinfurt,

    Rösch, Silke
    Schaeffler Technologies GmbH & Co. KG, Schweinfurt,

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP104298