Chemical Composition Base Element Fe (Iron) B (Boron) 0.0005 to 0.0035 % C (Carbon) 0.47 to 0.55 % Cr (Chromium) 0.3 % (maximum) Cu (Copper) 0.3 % (maximum) Fe (Iron) 97.1 to 98.8 % (estimate) Mn (Manganese) 0.6 to 0.9 % Mo (Molybdenum) 0.15 % (maximum) Ni (Nickel) 0.3 % (maximum) P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.035 % (maximum) Si (Silicon) 0.17 to 0.37 % 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. Other Information Material Class Ferrous Alloy Alloy Family Carbon Steel Alloy Group Medium-carbon steel Alloy Sub-Group Boron steel Country China Standards Body SAC (China) Description Bar; CD Designation 50B Specification Type Standard Specification GB 13791 Specification Year 1992 Specification Status Active Specification Status Notes Active in 2005 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 China State Bureau of Quality and Technical Supervision (CSBTS) (GB/JB/YB)
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Chemical Composition