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.USS CHAR-PAC is a heat treated carbon steel having exceptionally good notch toughness as well as high strength. It is recommended for pressure vessels, low temperature storage containers, earth moving equipment, offshore drilling rigs, etc.