Patent ID: 8864919

Claim:
An Ni-based forged alloy comprising: 0.001 to 0.1 mass % of C; 0.001 to 0.01 mass % of B; 16 to 22 mass % of Cr; 0.5 to 1.5 mass % of Al; 0.1 to 6.0 mass % of W; 3.5 to 5.5 mass % of Nb; 0.8 to 3.0 mass % of Ti; 16 to 20 mass % of Fe; 2.0 mass % or less of Mo; and the balance including Ni and unavoidable impurities, wherein: a segregation parameter Ps defined by a formula of “Ps (mass %)=1.05×[Al concentration (mass %)]+0.6×[Ti concentration (mass %)]−0.8×[Nb concentration (mass %)]−0.3×[Mo concentration (mass %)]” satisfies a relationship of “Ps−3.0 mass %”; and a total amount of W and Mo is 1.75 atomic % or less.