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.AISI 4337 is a tough, shock resisting, oil hardening alloy steel. In the heat treated condition it has high fatigue and tensile strength along with good ductility.