NI-BASED ALLOY SUPERIOR IN STRESS CORROSION CRACKING RESISTANCE IN ENVIRONMENT OF INORGANIC ACID-CONTAINING SUPERCRITICAL WATER

摘要

PPROBLEM TO BE SOLVED: To provide a Ni-based alloy having superior stress corrosion cracking resistance against a supercritical water containing an inorganic acid such as hydrochloric acid, which is produced by decomposing/oxidizing an organic hazardous material such as PCB and a dioxin, and to provide a member for a reaction vessel made of the Ni-based alloy used in a supercritical water process. PSOLUTION: The Ni-based alloy superior in stress corrosion cracking resistance in an environment of the inorganic acid-containing supercritical water has a composition comprising more than 28% but less than 34% Cr, more than 0.1% but less than 1.0% W, 0.001-0.05% Mg, 0.001-0.04% N, 0.05-0.5% Mn, further, as needed, one or two of more than 1.0% but 6% or less Nb, 0.01% or more but less than 0.5% Mo and 0.01-0.1% Hf, one or two of 0.1-10% Fe and 0.01-0.1% Si the balance Ni with unavoidable impurities, and C of the unavoidable impurity adjusted to an amount of 0.05% or less. PCOPYRIGHT: (C)2004,JPO