Chemical Composition Base Element Fe (Iron) C (Carbon) 0.15 to 0.2 % Cr (Chromium) 0.3 % (maximum) Cu (Copper) 0.3 % (maximum) Fe (Iron) 96.3 to 98.6 % (estimate) Mn (Manganese) 0.8 to 1.2 % Mo (Molybdenum) 0.45 to 0.65 % Ni (Nickel) 0.4 % (maximum) P (Phosphorus) 0.03 % (maximum) S (Sulfur) 0.025 % (maximum) Si (Silicon) 0.6 % (maximum) V (Vanadium) 0.03 % (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 5.01e6 lbf/ft^2 (minimum) Ultimate Tensile Strength 9.19e6 to 1.23e7 lbf/ft^2 Elongation 23 % strain (minimum) Other Information Material Class Ferrous Alloy Alloy Family Carbon Steel Alloy Group Low-carbon steel and HSLA steel Alloy Sub-Group Casting for pressure applications Country International Standards Body ISO (International) Description Castings for parts subject to pressure; QT Designation G18Mo5 Specification Type Standard Specification ISO 4991 Specification Year 2005 Specification Status Active Specification Status Notes active 2005 Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Available forms Casting Similar Alloys Click here to find similar alloys Links Organizations International Organization for Standardization (ISO)
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Chemical Composition

Base Element

Fe (Iron)