PURPOSE:To obtain a high-strength heat-resistant Co alloy for a gas turbine with superior hot corrosion resistance by blending Co with specified amounts of C, Si and/or Mn, Cr, Ni, W and/or Mo, Al and Hf. CONSTITUTION:The composition of an alloy is composed of, by weight, 0.01-1% C, 0.02-2% Si and/or Mn, 15-40% Cr, 5-15% Ni, 2-12% W and/or Mo, 0.01- 3% Al, 0.05-5% Hf and the balance Co with inevitable impurities. One or more among 0.01-5% one or more among Ta, Nb and Ti (A), 0.005-0.1% B and/or Zr (B) and 0.005-0.1% rare earth element (C) may be further added to the composition.
展开▼
