Ni-based alloy with excellent corrosion resistance against supercritical water environment containing inorganic acid

摘要

PPROBLEM TO BE SOLVED: To provide an Ni based alloy which has excellent corrosion resistance to supercritical water containing inorganic acid such as hydrochloric acid caused by the decomposition and oxidation of organic harmful matters such as PCB (polychlorinated biphenyls) and dioxine, and to provide a member for a supercritical water process reaction vessel consisting of the Ni based alloy. PSOLUTION: The Ni based alloy having excellent corrosion resistance to inorganic acid-containing supercritical water environment has a composition containing 29 to 42% Cr, 1 to 3% Ta, 0.001 to 0.05% Mg, 0.001 to 0.04% N, and 0.05 to 0.5% Mn, and, if required, containing one or more kinds selected from 0.1 to 2% Mo, 0.05 to 1.0% Fe, and 0.01 to 0.1% Si, and the balance Ni with inevitable impurities, and in which the content of C included as the inevitable impurities is controlled to 0.05%. PCOPYRIGHT: (C)2003,JPO