Chemical Composition Base Element Fe (Iron) C (Carbon) 0.52 to 0.6 % Fe (Iron) 98 to 98.8 % (estimate) Mn (Manganese) 0.6 to 0.9 % P (Phosphorus) 0.045 % (maximum) S (Sulfur) 0.045 % (maximum) Si (Silicon) 0.1 to 0.4 % 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 8.77e6 lbf/ft^2 (minimum) Ultimate Tensile Strength 1.46e7 to 1.98e7 lbf/ft^2 Elongation 12 % strain (minimum) Brinell Hardness 229 (maximum) Other Information Material Class Ferrous Alloy Alloy Family Carbon Steel Alloy Group Medium-carbon steel Alloy Sub-Group 1055 Country International Standards Body ISO (International) Description Direct-hardened wrought steel for black product machine parts; QT, mech props vary with diameter; ann to max hardness Designation C55 Specification Type Standard Specification ISO 683-1 Specification Year 1987 Specification Status Active Specification Status Notes active 1987 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 International Organization for Standardization (ISO)
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Chemical Composition