| Abstract Scope |
High temperature corrosion resistance is a major consideration to develop high temperature alloys, and complex alloy fabrication processes and industrial operation conditions create tremendous challenges to invent high performance alloys. Although high temperature alloys are developed to provide versatile high temperature corrosion resistance, some alloys have unique compositions to resist particular types of high temperature corrosion attack. HAYNES® HR-160® alloy was developed to provide excellent sulfidation resistance by optimizing its Co, Cr, and Si contents, and HAYNES® HR-235® alloy utilizes the non-catalytic effect of copper to carbon deposition for its excellent metal dusting resistance. The high temperature resistant behaviors of HR-160 and HR-235 alloys are presented, along with their mechanical and fabrication properties. Moreover, high temperature nitridation, chloridation, hot corrosion behaviors of commercial Ni- and Co-base alloys are analyzed to reveal the effects of alloy composition, including comparison between aluminum oxide (Al2O3) and chromium oxide (Cr2O3) scale. |