A New Developed Ni-Cr-Mo Alloy with Improved Corrosion Resistance in Flue Gas Desulfurization and Chemical Process Applications

摘要

Alloy UNS N06058 is a new Ni-21%Cr-19%Mo alloy which has been recently developed. Alloy UNS N06058 is the first Ni-Cr-Mo alloy to contain nitrogen as an alloying constituent. Together with the chromium and the increased molybdenum content the alloying of nitrogen results in a pitting resistance equivalent number (PREN) of about 86, surpassing the nickel-chromium-molybdenum alloys being commonly in use so far. As a result of the specific combination of its alloying constituents the new alloy is featuring an excellent balanced corrosion resistance in oxidizing as well as in reducing environments. In general the new material is characterised by superior resistance to general corrosion in acids and acidic mixtures even when contaminated with chlorides as well as to localised corrosion in regard to all other C-type alloys. Good fabricability including weldability is also given. This work reports on the main properties of alloy UNS N06058 and its suitability for interesting areas of application like flue gas desulfurization and severely corrosive chemical processes.