View Sample Alloy Digest Data Sheet (PDF)Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.SUPERTHERM is a cast nickel-chromium-iron alloy stabilized with cobalt and tungsten. It is used worldwide in extremely high-temperature applications and has unexcelled performance to 2300 F (1260 C). Among its many uses are components for heat-treating furnaces, cement kilns, petrochemical furnace tubes and refining furnace tubes.