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.REPUBLIC RSM 250 is an 18% nickel-cobalt-molybdenum age-hardening steel designed to develop 250,000 psi yield strength with good toughness. It is recommended where a combination of strength, toughness and notch resistance is required such as aircraft landing gears and jet engine components.