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.S-TEN2 is a steel alloy containing copper to make it more corrosion resistant to dew point corrosion than conventional carbon steels. It is used as tubing in economizers.