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.AISI Type 309 is a chromium-nickel, austenitic, heat and corrosion resisting steel recommended for high temperature applications in corrosive environments. It is intended primarily for high temperature applications at 1500 F or higher, where resistance to oxidation and/or corrosion is required.