Chemical Composition Base Element Fe (Iron) C (Carbon) 0.31 to 0.65 % Fe (Iron) 99.3 to 99.7 % (estimate) P (Phosphorus) 0.045 % (maximum) S (Sulfur) 0.045 % (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 1100 MPa (minimum) Ultimate Tensile Strength 1220 MPa (minimum) Elongation 8 % strain (minimum) Rockwell Hardness C scale 38 to 44 Other Information Material Class Ferrous Alloy Alloy Family Carbon Steel Alloy Group Medium-carbon steel Alloy Sub-Group 1045/1045H Country USA Standards Body ASTM (USA) Description Alloy fasteners in thread diameters M1.6- M100 for general engineering; QT Designation Class 12.9 Specification Type Standard Specification ASTM F568M Specification Year 2004 Specification Status Active Specification Status Notes active 2004 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