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.PYROWEAR Alloy 53 is a carburizing steel with good temper resistance and high case hot hardness combined with high core impact strength and fracture toughness.