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.ATHA PNEU is a shock resistant tool and die steel designed for applications requiring extreme toughness combined with good wear resistance and cutting properties. It conforms to AISI Type S1, SAE Type S1 and ASM Class III-D.