STP755

    Strength and Temper Embrittlement of Heavy-Section 2¼Cr-1Mo Steel

    Published: Jan 1982


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    Abstract

    The effects of austenitizing temperature and manganese, silicon, and phosphorus contents on temper embrittlement of 2¼Cr-1Mo steel associated with its strength were studied using laboratory heats.

    High manganese content or high austenitizing temperature improves the strength and the initial toughness by suppressing the formation of ferrite. Once a fully bainitic structure is obtained, the increase in strength and the decrease in toughness are small even if the manganese content or the austenitizing temperature increases.

    The manganese content should be as low as possible under the condition where the fully bainitic structure is obtained for toughness in the step-cooled condition. The increase in susceptibility to temper embrittlement caused by a high austenitizing temperature is small. It may be compensated for by reducing manganese, silicon, or phosphorus content.

    The addition of silicon, intended to obtain higher strength, must be compensated for by lowering the phosphorus content to decrease the susceptibility to temper embrittlement.

    On the basis of the laboratory experiments, a 2¼Cr-1Mo steel forging with a thickness of 397 mm was produced. The forging exhibited a good combination of strength and toughness in the step-cooled condition.

    Keywords:

    strength, toughness, temper embrittlement, austenitizing temperature, austenite grain size, manganese, silicon, phosphorus


    Author Information:

    Sato, S
    Senior Researcher, Mizushima Laboratory, Research Laboratories, Kawasaki Steel Corporation, Kurashiki,

    Matsui, S
    Senior Researcher, Mizushima Laboratory, Research Laboratories, Kawasaki Steel Corporation, Kurashiki,

    Enami, T
    Senior Researcher, Mizushima Laboratory, Research Laboratories, Kawasaki Steel Corporation, Kurashiki,

    Tobe, T
    Assistant Manager, Casting and Forging Department, Mizushima Works, Kawasaki Steel Corporation, Kurashiki,


    Paper ID: STP28424S

    Committee/Subcommittee: A01.10

    DOI: 10.1520/STP28424S


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