Chemical Composition Base Element Fe (Iron) B (Boron) 0.0005 % (minimum) C (Carbon) 0.15 to 0.4 % Fe (Iron) 99.1 to 99.5 % (estimate) Mn (Manganese) 0.74 % (minimum) P (Phosphorus) 0.048 % (maximum) S (Sulfur) 0.058 % (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 720 MPa (minimum) Ultimate Tensile Strength 900 MPa (minimum) Elongation 10 % strain (minimum) Rockwell Hardness C scale 27 to 36 Other Information Material Class Ferrous Alloy Alloy Family Carbon Steel Alloy Group Low-carbon steel and HSLA steel Alloy Sub-Group Boron steel Country USA Standards Body ASTM (USA) Description Low C martensite fasteners in thread diameters M1.6-M16 for general engineering; QT Designation Class 9.8 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