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.SANDVIK SANICRO 31HT is an austenitic iron-nickel-chromium alloy characterized by very good resistance to oxidation with good mechanical properties at elevated temperatures. It is recommended for resistance element sheathing, pyrometer tubes, airheaters, equipment for heat treating, furnace tubes, and other equipment in the petrochemical industry.