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.RA 253MA is an austenitic heat-resistant alloy with high strength and outstanding oxidation resistance. The use of rare earth metals in combination with silicon provides oxidation resistance to about 2100 F. Nitrogen, carbon and dispersed rare earth and alkali metal oxides provide creep rupture strength comparable to nickel-base alloys.