Chemical Composition Base Element Fe (Iron) C (Carbon) 0.2 % (maximum) Cr (Chromium) 0.5 to 1 % Fe (Iron) 96 to 98.2 % (estimate) Mn (Manganese) 0.7 to 1.2 % Mo (Molybdenum) 0.2 to 0.6 % P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.035 % (maximum) Si (Silicon) 0.4 to 0.8 % Zr (Zirconium) 0.04 to 0.12 % 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 620 MPa (minimum) Ultimate Tensile Strength 740 to 890 MPa Elongation 17 % strain (minimum) Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group 4118/ 4120/ 4121 Country USA Standards Body ASTM (USA) Description High-strength alloy steel plates <=50 mm for use in fusion welded pressure vessels; QT, killed steel. Designation Class 2 Specification Type Standard Specification ASTM A782/A782M-90 Specification Year 2001 Specification Status Active Specification Status Notes active 2001 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