round bar 1.hot rolled ordinary carbon round bar size: 10mm-300mm material: Q235 2.hot rolled good-quality round bar size: 12mm-300mm material: 10#--45# S20C S45C 3.hot rolled lower alloy round bar size: 12mm-300mm material: Q345 4.hot rolled alloy round bar size: 12mm-300mm material: 20Cr-40Cr, 20Mn-65Mn, 15CrMo-42 CrMo, 20Mn2-40 Mn, 20CrNiMoA-40 CrNiMoA, 38CrSi, 30CrMnSi, 20CrMnTi, 9CrSi, 9Mn2