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.Berylco 20CR is the most widely used high strength beryllium copper casting alloy. This alloy can be heat treated to high hardness and tensile strengths; it has high impact strength and good corrosion resistance.