Chemical Composition Base Element Fe (Iron) Al (Aluminum) 0.95 to 1.3 % C (Carbon) 0.38 to 0.43 % Cr (Chromium) 1.4 to 1.8 % Fe (Iron) 94.9 to 96.3 % (estimate) Mn (Manganese) 0.5 to 0.7 % Mo (Molybdenum) 0.3 to 0.4 % P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.04 % (maximum) Si (Silicon) 0.15 to 0.35 % 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 Brinell Hardness 248 to 302 Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group 4140/ 4142 Country USA Standards Body ASTM (USA) Description Alloy steel bars for surface hardening by nitriding; electric-furnace process only; HR, QT Designation Class A Range 2 Specification Type Standard Specification ASTM A355-89 Specification Year 2000 Specification Status Active Specification Status Notes active 2000 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