Chemical Composition Base Element Fe (Iron) C (Carbon) 0.2 to 0.53 % Cr (Chromium) 0.45 % (minimum) Cu (Copper) 0.2 to 0.6 % Fe (Iron) 98.4 to 98.8 % (estimate) Mn (Manganese) 0.4 % (minimum) Mo (Molybdenum) 0.15 % (minimum) Ni (Nickel) 0.2 % (minimum) P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.04 % (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 940 MPa (minimum) Ultimate Tensile Strength 1040 to 1210 MPa Elongation 14 % strain (minimum) Brinell Hardness 311 to 352 Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Nickel chromium molybdenum steel Alloy Sub-Group Miscellaneous nickel chromium molybdenum steel Country USA Standards Body ASTM (USA) Description QT weathering alloy steel, heavy hex structural bolts, sizes<=M20; tensile requirements for machined specimens. Designation Type 3 Specification Type Standard Specification ASTM A490/A490M Specification Year 2004 Specification Status Obsolete 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

Base Element

Fe (Iron)