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.HASTELLOY ALLOY R-235 is a vacuum-melted nickel-base precipitation-hardening alloy with outstanding properties through 1750 F. It has good oxidation resistance, and a remarkable resistance to overaging in service.