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.CARPENTER O6 is an oil-hardening tool steel for cold-work applications. It is designed to have free graphite in the microstructure. This free graphite is responsible for the excellent machinability of this grade. Among the many applications of Carpenter O6 are dies for various uses, punches, gages, bushings, mandrels, pneumatic hammers, stamps, taps, rotary slitting cutters and wear plates.