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.Virgo 39 is a 1% Mo low-carbon martensitic stainless steel. This composition allows both weldability and enhanced corrosion resistance. The alloy is primarily designed for erosion-corrosion resistance in Pelton wheel and Kaplan blade-type applications.