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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 21-55N Valve Steel is an austenitic nitrogen-bearing chromium-nickel-manganese alloy which offers an excellent combination of high temperature strength and corrosion resistance for exhaust valve applications. It is widely used as the head material in two-piece valves for internal combustion engines. It is also finding increasing use for one-piece valves in automobile engines.