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.Alloy Steel 2515 (Nonstandard, formerly AISI-SAE 2515) is a 5% nickel steel well suited for special and/or heavy-duty carburizing applications. It was one of the earliest alloy steels and offers a good combination of strength and low-temperature toughness for non-carburized applications. It has been used in some European countries for many years for cryogenic applications.