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.PX5 is a prehardened steel for plastic molds with superior characteristics in weldability. The steel can be welded in the process of manufacturing a plastics mold without requiring preheating and postheating.