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    Experiences in Using Ultrasonic Testing of Bearing Steel for Demanding Applications

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    The demands on modern machine parts, i.e., bearings, are increasing constantly. To ensure that highly clean steel is used, a number of different test methods are commonly used. In the field of test methods the ultrasonic immersion testing has reached a dominant position. This paper will give a short comparison of the ASTM E 588-03 and the SEP 1927 standards and will point out some experiences the authors have made using ultrasonic testing as a tool to increase steel cleanliness and using ultrasonic testing and blue fracture testing as complementary test methods. To be able to use ultrasonic testing as a powerful tool, a number of side aspects like the geometry of the test piece, the structure of it, or the frequency of the used ultrasonic-probe are important. This will be demonstrated by showing results from testing and incoming inspection.


    steel cleanliness, ultrasonic immersion testing, structure, surface

    Author Information:

    Trojahn, W.
    Manager Materials Development, Schaeffler, KG

    Janser, K.
    Development Production Electronics and Nondestructive Testing, Schaeffler, KG

    Roesch, O.
    Process Release and Supplier, Schaeffler, KG

    Committee/Subcommittee: A01.06

    DOI: 10.1520/STP41636S