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.AL20 was originally developed for improved resistance to corrosion in sulfuric acid or other reducing acids, but is now used in a wide range of applications. The alloy is readily available in most product forms.