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.VascoMax 250 is an 18% nickel alloy steel having superior toughness and ductility at yield strength levels of 250,000 psi. It is recommended for high strength applications in the temperature range - 320 F to 900 F. It is a martensitic steel strengthened by precipitation and an ordering reaction.