PURPOSE:To obtain a Co-base high-strength heat-resistant alloy for a gas turbine with superior hot corrosion resistance by alloying Co with specified amounts of C, Si, Cr, Ni, W and/or Mo and Hf. CONSTITUTION:The composition of an alloy is composed of, by weight, 0.05- 0.7% C, 0.1-2% Si, 35-40% Cr, 5-18% Ni, 2-12% W and/or Mo, 0.5-5% Hf and the balance Co with inevitable impurities. One or more among 0.05-1% Mn (A), 0.5-3% Ta and/or Nb (B) and 0.005-0.1% B and/or Zr (C) may be further added to the composition.
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