Chemical Composition Base Element Fe (Iron) C (Carbon) 0.35 to 0.45 % Cr (Chromium) 0.75 to 1.15 % Fe (Iron) 96.5 to 97.9 % (estimate) Mn (Manganese) 0.7 to 1.05 % Mo (Molybdenum) 0.13 to 0.27 % P (Phosphorus) 0.04 % (maximum) S (Sulfur) 0.04 % (maximum) Si (Silicon) 0.15 to 0.35 % V (Vanadium) 0.1 % (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 1.15e7 lbf/ft^2 Ultimate Tensile Strength 1.58e7 lbf/ft^2 Brinell Hardness 229 to 277 Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group 4140/ 4142 Country USA Standards Body MIL (USA) Description Gear, pinion forging heat-treated; shipboard propulsion and turbine Designation Class 3 Specification Type Standard Specification MIL-S-19434B Specification Year 1990 Specification Status Active Specification Status Notes Active 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 Department of Defense (MIL/DoD-F/FED QQ)
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Chemical Composition