Chemical Composition Base Element Fe (Iron) C (Carbon) 0.05 to 0.2 % Cr (Chromium) 2 to 2.75 % Cu (Copper) 0.5 % (maximum) Fe (Iron) 93.5 to 96.5 % (estimate) Mn (Manganese) 0.5 to 0.9 % Mo (Molybdenum) 0.9 to 1.1 % P (Phosphorus) 0.04 % (maximum) S (Sulfur) 0.045 % (maximum) Si (Silicon) 0.8 % (maximum) V (Vanadium) 0.03 % (maximum) W (Tungsten) 0.1 % (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 380 MPa (minimum) Ultimate Tensile Strength 585 to 760 MPa Elongation 20 % strain (minimum) Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group Chromium molybdenum casting Country USA Standards Body ASTM (USA) Description Castings, norm and tempered, QT, for pressure-containing parts Alternate Name formerly 8N Designation 8A Specification Type Standard Specification ASTM A487/A487M-93 Specification Year 2003 Specification Status Active Specification Status Notes active 2003 Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Available forms Casting Similar Alloys Click here to find similar alloys Links Organizations American Society for Testing and Materials (ASTM)
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Chemical Composition