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.UCI-198 is best described as an HP alloy modified with niobium and with microalloying by titanium and rare-earth elements. The alloy was developed to produce increased creep resistance in furnace tube applications.