STP903

    Development of Integral High-Pressure—Low-Pressure Combination Rotor Forgings

    Published: Jan 1986


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    Abstract

    Integral high pressure (HP)-low pressure (LP) combination rotor forgings for single-cylinder turbines used under the steam condition over 773 K require good toughness and elevated temperature strength. Conventional Ni-Cr-Mo-V or Cr-Mo-V steel forgings are undesirable from the viewpoint of material properties. We developed integral HP-LP combination rotor forgings by alloy modifications (niobium and nickel addition) based upon Cr-Mo-V steel and the application of differential heat treatment. An actual dimensional prototype sample forging (1650 mm in diameter) was manufactured and evaluated. The forging exhibited high quality, and superior creep rupture strength at the HP zone and excellent toughness at the LP zone were obtained simultaneously. These developed rotor forgings have been applied for several turbine units of about the 100-MW class.

    Keywords:

    steam turbine, rotor, creep rupture strength, toughness, tensile strength, proof stress, differential heat treatment, nickel, niobium


    Author Information:

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

    Miyazaki, M
    Engineer, manager, and engineer, Toshiba Corp., Heavy Apparatus Engineering Laboratory, Yokohama,

    Watanabe, O
    Engineer, manager, and engineer, Toshiba Corp., Heavy Apparatus Engineering Laboratory, Yokohama,

    Kawai, M
    Senior researcher, Toshiba Research and Development Center, Toshiba Corp., Yokohama,


    Paper ID: STP17352S

    Committee/Subcommittee: A01.06

    DOI: 10.1520/STP17352S


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