NICKEL BASE ALLOY HAVING HIGH RESISTANCE TO STRESS CORROSION CRACKING AND METHOD OF PRODUCING SAME

摘要

A member adapted for use under a stress in an atmosphere of a temperature below the creep temperature and made from an Ni base alloy having a high resistance to stress corrosion cracking. The Ni alloy consists essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni, and has an austenite matrix in which precipitated is at least on of Y' phase and Y" phase. The member can suitably used as parts which are subjected to pure water in nuclear reactor.