PURPOSE AND SCOPE This specification supplies engineers and designers with: 1) Poppet valve nomenclature 2) Poppet valve alloy designations 3) Chemical compositions of poppet valve alloys 4) A guide to alloy metallurgy and heat treatments 5) General information on properties of valve alloys 6) A guide to the applications of alloys 7) A description of valve design and construction@ and their relation to valve alloy selection 8) Valve gear design considerations that affect valves.