Chemical Composition Base Element Fe (Iron) C (Carbon) 0.45 to 0.59 % Fe (Iron) 98.4 to 98.8 % (estimate) Mn (Manganese) 0.6 to 0.9 % P (Phosphorus) 0.045 % (maximum) S (Sulfur) 0.05 % (maximum) Si (Silicon) 0.15 % (minimum) 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 50 ksi Ultimate Tensile Strength 87.7 ksi Elongation 22 % strain Other Information Material Class Ferrous Alloy Alloy Family Carbon Steel Alloy Group Medium-carbon steel Alloy Sub-Group 1055 Country USA Standards Body ASTM (USA) Description Rail axles, drop test required, t<203 mm Designation F Specification Type Standard Specification ASTM A21-94 Specification Year 1999 Specification Status Obsolete Specification Status Notes withdrawn 2003 Source Worldwide Guide to Equivalent Irons and Steels, 5th ed.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