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.JESSOP No. 9, super high tensile steel, is one of the toughest and most wear resistant steels of its class in existence. Primarily developed as a high tensile, non-magnetic armor plate, it has since been widely used for equipment subject to severe battering.