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.Sandvik 3R12HT is an improved version of Type 304L for better mechanical properties at high temperatures. This is accomplished by improved metallurgical processing and a modified chemistry.