HIGH-STRENGTH HEAT-RESISTANT CO ALLOY FOR GAS TURBINE

PURPOSE:To obtain a high-strength heat-resistance Co alloy for a gas turbine having superior strength, oxidation resistance and hot corrosion resistance in an oxidizing atmosphere at high temp. by adding specified amounts of Cr, Ni, W, Mo and other elements as essential components to Co. CONSTITUTION:A heat resistant Co alloy contg. 0.01-1% C, 0.01-2% 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 0.01-1% Y as essential components is used as a high strength Co alloy for a gas turbine used in an oxidizing atmosphere at >=1,000 deg.C high temp. The heat resistance Co alloy may further contain 0.01-3% 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) at an individual state or a combined state.