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 3R66 is an austenitic grade with low interstitial element levels of carbon and nitrogen. Although many applications exist for clean steels, the alloy was developed specifically for electronic tubing for the production of microchips.