TRACK: Emerging Technology
High-temperature corrosion poses significant challenges to high-temperature wrought alloys in process industries because of corrosion degradation, especially in extreme environments. Although a lot of high temperature corrosion data of high-temperature wrought alloys has been generated from lab testing and industry practices, the challenges always exist as the corrosion behaviors of an alloy often vary with operation conditions, such as an alloy with satisfied corrosion resistance in one process may not be suitable to another process. For instance, the operation temperature of ammonia synthesis process is below 1000°F, in which Fe-base alloys are widely used. However, the ammonia cracking process exposes alloys to much higher temperatures, such as 1300°F and above, in which Fe-base alloys suffer extreme nitridation attack and even many Ni-base alloys cannot provide sufficient nitridation resistance. This presentation illustrates high-temperature corrosion resistant behaviors of the widely used wrought Ni-base alloys, including HAYNES® 214®, 233®, 230®, 282®, 244®, HR-224®, HR-235®, HR-160®, 625, 617, etc. alloys, in extreme environments, especially providing the latest data and experience in resisting high-temperature oxidation, sulfidation, carburization/metal dusting, nitridation, and chloridation. It will provide insights and understanding of high-temperature corrosion mechanisms, alloy composition effects, and alloy performance to assist alloy selection and evaluation in process industries.