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.CENTRI-CAST GRAY IRON 45 has a nominal tensile strength of 45,000 psi. It is gray iron cast centrifugally in the form of tubing which has a wide range of uses for applications where freedom form pattern cost is an important consideration and where size and shape are of paramount importance. Its many applications include automotive equipment, farm machinery, bushings and machine tools.