STP1259

    Development of High Strength 12% Cr Ferritic Steel for Turbine Rotor Operating above 600‡C

    Published: Jan 1997


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    Abstract

    An advanced 12% chromium ferritic steel has been developed for the high-temperature rotors in improved fossil-fired power plants. The development of this steel is based on the experimental studies of various 12% chromium heat resistant steels. Effects of alloy elements on the creep rupture strength have been investigated and the 10Cr-1.8W-0.7Mo-V-3Co-Nb-B steel was selected to be a hopeful candidate. This revealed the creep rupture strength was higher than that of 10Cr-1Mo-1W-V-Nb rotor steel being used at 593‡C.

    The producibility and properties of the new steel have been verified with the medium size trial forging manufactured from a 20 ton ingot. Although a few technical subjects are remaining, these are expected to be solved with the modification of the manufacturing process.

    This newly developed high strength 12% chromium ferritic steel is expected to be applicable to high-temperature rotors operating at 630‡C or above, and the significant improvement of thermal efficiencies would be obtained in fossil-fired power plants.

    Keywords:

    heat resistant steel, 12% Cr ferritic steel, high-temperature rotor, fossil-fired power plant, creep rupture strength


    Author Information:

    Tsuda, Y
    Specialist, manager, and engineer, Heavy Apparatus Engineering Laboratory, Toshiba Corp., Yokohama,

    Yamada, M
    Specialist, manager, and engineer, Heavy Apparatus Engineering Laboratory, Toshiba Corp., Yokohama,

    Ishii, R
    Specialist, manager, and engineer, Heavy Apparatus Engineering Laboratory, Toshiba Corp., Yokohama,

    Tanaka, Y
    Senior research engineer, and research engineer, Muroran Laboratory, The Japan Steel Works, LTD., Muroran,

    Azuma, T
    Senior research engineer, and research engineer, Muroran Laboratory, The Japan Steel Works, LTD., Muroran,

    Ikeda, Y
    General manager, Muroran Plant, The Japan Steel Works, LTD., Muroran,


    Paper ID: STP16607S

    Committee/Subcommittee: A01.06

    DOI: 10.1520/STP16607S


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