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.Uranus 45N+ (UR 45N+) is a modification of the 2205 or UNS S31803 composition to which molybdenum and nitrogen have been optimized to develop a pitting resistance equivalent nitrogen (PREN) number that is 36 or greater.