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.UGIMA 4401 (UGIMA 316) is identical to UGINE 4401 (AISI 316) in analysis, corrosion resistance, mechanical properties, and forging and welding abilities but dissimilar in machinability. A specific melting process creates inclusions (malleable oxides with a low melting point), which improve machinability by 20-30% compared with an AISI 316 (1.4401) stainless steel.