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.ALLOY 36 is an iron-36% nickel alloy with the lowest thermal coefficient of expansion among commercial alloys. It is recommended for applications that require very low dimensional changes with variations in temperature. Among many applications it is used for length standards, bimetals and tapes and wires for geodetic measurements.