Chemical Composition Base Element Fe (Iron) C (Carbon) 0.05 to 0.15 % Cr (Chromium) 2.7 to 3.3 % Fe (Iron) 94.3 to 96.2 % (estimate) Mn (Manganese) 0.3 to 0.6 % Mo (Molybdenum) 0.8 to 1.06 % P (Phosphorus) 0.025 % (maximum) S (Sulfur) 0.025 % (maximum) Si (Silicon) 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 205 10^7 dyne/cm^2 (minimum) Ultimate Tensile Strength 415 to 585 10^7 dyne/cm^2 Elongation 20 % strain (minimum) Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group Miscellaneous chromium molybdenum steel Country USA Standards Body ASTM (USA) Description Ferritic steel forgings for boilers, pressure vessels, high-temp parts and associated equipment. Alternate Name formerly Class F21A Designation Grade F21, Class1 Specification Type Standard Specification ASTM A336/A336M 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 Wrought Similar Alloys Click here to find similar alloys Links Organizations American Society for Testing and Materials (ASTM)
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Chemical Composition