Chemical Composition Base Element Fe (Iron) C (Carbon) 0.28 to 0.38 % Cr (Chromium) 22 to 24 % Fe (Iron) 60.7 to 68.5 % (estimate) Mn (Manganese) 1.5 to 3.5 % Mo (Molybdenum) 0.5 % (maximum) N (Nitrogen) 0.25 to 0.35 % Ni (Nickel) 7 to 9 % P (Phosphorus) 0.05 % (maximum) S (Sulfur) 0.03 % (maximum) Si (Silicon) 0.5 to 1 % W (Tungsten) 0.5 % (maximum) Composition Note Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one. Mechanical Properties Yield Strength 84.1 ksi Ultimate Tensile Strength 146 ksi Other Information Material Class Ferrous Alloy Alloy Family High-Alloy Steel (Corrosion and Heat Resistant, Stainless, and Nickel Steels) Alloy Group Austenitic stainless steel Alloy Sub-Group Miscellaneous austenitic steel Country USA Standards Body SAE (USA) Description Engine poppet valve, austenitic. Alternate Name formerly EV 16, commercially 23-8N Designation S63018/X 33 CrNiMnN 23 8 Specification Type Standard Specification SAE J775 Specification Year 1993 Specification Status Active Specification Status Notes active 1993 Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Available forms Wrought Similar Alloys Click here to find similar alloys Links Organizations SAE, International (SAE) (SAE J)
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Chemical Composition