Abstract
Several Ni-Cr-Mo alloys (C-type) are currently available for use in general-purpose applications in the Chemical Process Industry. This family of alloys is well known for its versatile corrosion resistance. However, most of these alloys possess only moderate strength. While their strength can be increased though cold work, this is often not a viable method of fabrication. Of more usefulness would be an alloy with excellent corrosion resistance and high strength in the as-heat treated condition. While some commercially available corrosion alloys are age-hardenable, none possess the versatile corrosion resistance characteristic of the C-type alloys. To fill this performance gap, a new alloy, essentially Ni-21Cr-17Mo (wt.%), has been developed which exhibits corrosion resistance comparable to other C-type alloys, but which can be heat treated to obtain approximately double the yield strength. In addition to its high uniform corrosion resistance in oxidizing as well as reducing environments, the as-heat treated alloy possesses high resistance to chloride-induced pitting and crevice corrosion attack. In this paper, the corrosion and mechanical properties of the new alloy are presented.
