At heat treatment manner of the nickel basic alloy and the nickel basic alloy, and the component null percentage by weight for nuclear energy which uses

摘要

PROBLEM TO BE SOLVED: To provide a nickel-based alloy having a superior grain-boundary type stress-corrosion cracking resistance in water of a high temperature and a high pressure, and endurance for a long service in the water of the high temperature and the high pressure in the vessel of a nuclear reactor.;SOLUTION: The nickel-based alloy has a chemical composition comprising, by weight percentage, 0.08% or less C, 0.35% or less Si, 0.35% or less Mn, 0.015% or less P, 0.015% or less S, 50% to 55% Ni, 17% to 21% Cr, 2.8% to 3.3% Mo, 0.3% or less Cu, 0.2% to 0.8% Al, 0.65% to 1.15% Ti, 4.75% to 5.50% Nb+Ta, 0.006% or less B, and the balance Fe with unavoidable impurities. The heat treatment method is characterized by solution-treating the nickel-based alloy having the above chemical composition at a temperature of 995°C to 1,040°C, for 30 minutes to 20 hours.;COPYRIGHT: (C)2004,JPO