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.Aluchrom 4 18 YHf is an oxidation resistant ferritic stainless steel alloyed with aluminum. The alloy has improved workability over Aluchrom YHF (see Alloy Digest SS-899).