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.Nickel-Copper-Columbium Steel is used in the hot-rolled and aged condition and develops yield strengths in the range 75,000 to 100,000 psi, depending on alloy content and section thickness.