STP987

    Properties of Through-Hardening Bearing Steels Produced by BOF Blowing Metallurgy and by Electric Arc Furnace with Ladle Metallurgy

    Published: Jan 1988


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    Abstract

    This paper discusses the cleanliness of through-hardening bearing steels produced by different melting and deoxidation processes. Macroscopic cleanliness is tested by the step-down and blue fracture test, and microscopic cleanliness is classified according to three rating methods. Cleanliness values of the air-melted heats are compared with remelted steels. Oxide inclusions are related to the oxygen contents of the heats, titanium-carbonitrides to the titanium contents, and sulfide inclusions to the sulfur contents of the heats. Machinability is effected more by carbide grain sizes than by sulfur contents. Ingot- and continuous cast steels are compared on cleanliness and segregation.

    Keywords:

    melting procedures, aluminium deoxidation, calcium treatment, macroinclusions, microinclusions, rating methods, fatigue behavior, machinability, ingot and continuous casting, segregation, basic oxygen furnace (BOF)


    Author Information:

    Baum, R
    Director of process technology, Thyssen Edelstahl Werke AG, Krefeld,

    Böhnke, K
    Manager of quality control, Thyssen Edelstahl werke AG, Witten,

    Boeckers, T
    Manager of quality control, Thyssen Stahl AG, Duisburg,

    Klemp, H
    Manager of quality control, Wälzlagerrohr GmbH, Krefeld,


    Paper ID: STP26246S

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP26246S


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