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.CLI-SAF 2507 is a superaustenitic/ferritic duplex stainless steel with a pitting resistance equivalent number (PREN) greater than 40. This grade was formerly called Uranus 47N+ and is an overalloyed replacement variant of UR 47N (See Alloy Digest SS-564).