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.Nirosta 4427 is a molybdenum, 18-11-3 type austenitic stainless steel with molybdenum content at the high end of the standard range for type 316 stainless steel. With a higher sulfur content, this grade is specifically aimed at machining. The alloy is often referred to as Type 316F in the United States.