... steel bar. Below is some details for alloy steel bar: 1. hot rolled low alloy round bar Size: 12mm-300mm Material: Q345 ... 2. hot rolled alloy round bar Size: 12mm-300mm Material: 20Cr-40Cr, 20Mn-65Mn, ... , 38CrSi, 30CrMnSi, 20CrMnTi, 9CrSi, 9Mn2 3. hot rolled high speed alloy tool steel Size: 12mm-300mm Material: W18Cr4V, M42, W6, W9, 3Cr2W8V ...