| 摘要 |
PROBLEM TO BE SOLVED: To provide an Ni-based casting superalloy, having a high level of balance among a grain boundary strength, a high-temperature strength, and an oxidation resistance, and achieving cost reduction.SOLUTION: There is provided an Ni-base casting superalloy including: in mass%, 0.03 to 0.15% of C; 0.005 to 0.04% of B; 0.01 to 1% of Hf; 0.05% or less of Zr; 3.5 to 4.9% of Al; 4.4 to 8% of Ta; 2.6 to 3.9% of Ti; 0.05 to 1% of Nb; 8 to 12% of Cr; 1 to 6.9% of Co; 4 to 10% of W; 0.1 to 0.95% of Mo; at least one of Si and Fe, where in the case when the Si is contained, the content is 0.02 to 1.1 mass %, and the Fe is contained, the content is 0.1 to 3%; and the balance including Ni and incidental impurities, with the content of Al+Ti+Si being 8.8 mass% or less and the content of Co+Fe being 1 to 6.9 mass% or less. |
