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4340 Carbon Steel Round Bar Products Description Product Name Carbon Steel Bar Main Material Types 20#-45#,50#,T8-T10,16Mn-50Mn,30Mn2-50Mn2,20Cr,40Cr,20-35SiMn, 20CrMnTi,20CrMo;30CrMo;35CrMo;42CrMo; ...