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.USS 18-8S (AISI Type 304) and USS 18-8I (AISI Type 304L) are austenitic chromium-nickel steels that are easy to fabricate and weld. They combine high strength with excellent stability and shock resistance, even at cryogenic temperatures.