This paper describes the design concepts, experimental studies, and production activities associated with the development of a new, wrought Ni-Cr-Mo alloy. The objective of the project was to provide a material with very high resistant; to both oxidizing and non-oxidizing (reducing) acids. For oxidizing acids, a base composition with a high chromium content was selected, The critical step in the development of this new alloy was the gathering of experimental evidence that copper, at certain levels, can be usefl to enhance significantly the resistance of the base composition to sulfhric acid, in the concentration range 10 to 60 wt.%, and dilute hydrochloric acid, without deteriming to its general characteristics. Copper also appears to be of benefit in hydrofluoric and phosphoric acids. A large scale heat of the most promising composition was melted and processed into plates, sheets, bars, and wires (for welding), without problems. The corrosion behavior and mechanical properties of some of these production materials are given in this paper,
Keywords:nickel-based alloy, alloy development sulfuric acid, hydrochloric acid, uniform corrosion, pitting, crevice corrosion