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    Progress in the Evaluation of CSS-42L™: A High Performance Bearing Alloy

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    This paper presents a technical update on the on-going evaluation of CSS-42L™ (US Patent #5,424,028).[1] The alloy is a case carburizable, stainless steel alloy which has been demonstrated to have a key combination of properties suited for ideal bearing performance: High surface hardness, hot hardness for usage up to 427°C (800°F), high fracture toughness, and corrosion resistance. Initial rolling contact fatigue data suggested that the alloy should have superior bearing life. This paper concentrates on data generated since the last ASTM bearing symposium[2] Both bearing life test data and wear resistance test data illustrate the alloy has excellent properties. Bearing life tests have been performed which illustrate superior life to both M50 and 52100. Wear resistance tests have also been performed. In a contaminated wear test environment of Al2O3, CSS-42L steel performs very well in comparison with M50 and Cronidur-30. Wedeven wear resistance tests on case components also show excellent behavior.

    Author Information:

    Tomasello, CM
    Research Specialist, Timken Latrobe Steel, Latrobe, PA

    Burrrier, HI
    Materials Technologist, The Timken Company, Canton, OH

    Knepper, RA
    Director of Technology, Timken Aerospace and Super Precision, Keene, NH

    Balliett, S
    Director of Technology and Quality, Timken Latrobe Steel, Latrobe, PA

    Maloney, JL
    Manager, The Timken Company, Canton, OH

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP10867S