Steel StructureChina Mill Factory (ASTM A36, SS400, S235, S355, St37, St52, Q235B, Q345B) Hot Rolled Ms Mild Carbon Steel Plate, Find details about China St 37 Ms Plate, St 52 Mild Steel Plate from China Mill Factory (ASTM A36, SS400, S235, S355, St37, St52, Q235B, Q345B) Hot Rolled Ms Mild Carbon Steel Plate