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 Types 309 and 309S are austenitic stainless steels with superior oxidation resistance and high temperature strength compared to Type 304, the basic grade in this series.