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.ARMCO 12 SR was developed specifically for automotive exhaust applications. It has greater oxidation resistance than AISI Type 409 and it exhibits formability and weldability comparable to more highly alloyed ferritic grades.