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.U.S.S. 18-8 Cb-Ta is an austenitic chromium-nickel type stainless steel with the carbon stabilized by columbium-tantalum for welding and elevated temperature service. This type is useful when the weldment is not annealed after welding.