N-155

Superalloy 155 is an iron-based alloy with high strength resistance of up to 815°C (1500°F). It can sustain moderate loading at temperatures of 1093°C (2000°F). It has good oxidation resistance at high temperatures and good corrosion resistance to sulfuric acid (at room temperature) and to nitric acid. This alloy’s high-temperature strength is gained from its chemical composition rather than from age hardening. Superalloy 155 behaves like austenitic 300 series stainless steels during machining using conventional methods and has good ductility. It can be easily formed using conventional methods but it has a tendency to work harden so solution heat treatment may be needed to gain back some ductility during cold forming operations. Superalloy 155 can be solution heat-treated at 1177°C (2150°F) and then water quenched or quickly air-cooled.