1: Material: Q235, Q345, ASTM A36, ST37-2, S235JR, S275JR, S355JR, ST57-3 2: Size: 4.5-630mm for thickness 1: Material: Q235, Q345, ASTM A36, ST37,2, S235JR, S275JR, S355JR, ST57,32: Size: 4.5-630mm for thickness3:usage: widely used for steel structure building project machinery, heavy trucks, bridge, pressure containers. carbon steel medium plate