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.Marker G-4849 is a 18Cr-38Ni heat resistant alloy casting for the petrochemical plants. Applications include pyrolysis furnaces and furnace headers.