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.A.C.I. Type CK-20 is the 25-20 type corrosion resisting casting alloy. It has high degree of stability against intergranular corrosion. It is recommended for chemical plant equipment, oil refinery components and paper and pulp industry parts.