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.Carpenter Stainless 20Cb-3 is an austenitic stainless steel designed for improved resistance to sulphuric acid. It finds wide use in all phases of the chemical industry. It has good mechanical properties and comparative ease of fabrication. Columbium stabilizes the alloy to minimize carbide precipitation during welding.