Group Iv Or V Transition Metal Containing Patents (Class 420/47)
  • Shroud for gas turbines
    Patent number: 4615658
    Abstract: This invention relates to an improvement on material of a shroud for gas turbines. The material comprises 0.25-0.7 wt % C, 20-35 wt % Cr, 20-40 wt % Ni and balance Fe, and has an austenitic structure. The amount of the .sigma.-phase in this invention is less than 5% and Nv value (Electron Vacancy Number) is less than 2.8.
    Type: Grant
    Filed: July 11, 1985
    Date of Patent: October 7, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Hiromi Kagohara, Yutaka Fukui, Masahiko Sakamoto, Nobuyuki Iizuka