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.AL 439HP is similar to the popular alloy Type 439, except for its very low carbon content. The low carbon content of AL 439HP enhances its formability and intergranular corrosion resistance.