Inconel Alloy 690-A New Corrosion Resistant Material

Abstract

INCONEL Alloy 690 (Ni-30Cr-9Fe-0.02C, wt. %), is a new high-chromium nickel-base alloy, designed to provide a stable austenitic structure combined with resistance to corrosion and oxidation in aggressive industrial environments at elevated temperatures. Extensive laboratory evaluation of Alloy 690 during the past 12 years has demonstrated remarkable resistance to sensitization, and to stress corrosive cracking in chloride environments. In high temperature water, this material resists stress corrosion attack over a wide range of tepmeratures, oxygen contents in the presence of crevices, and lead contamination. Alloy 690 has been found to release only a negligible amount of material when exposed to high velocity water at elevated temperatures-a fact that may be of major importance in light water reactor technology.