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.MUELLER ALLOY 1820 (formerly MBCo 902) is a chromium-copper alloy with high electrical conductivity, high mechanical strength, and superior creep, fatigue and wear properties. It is used for resistance welding electrodes, switchgear, and electrical and electronic parts.