... Q345, 20#, ST37, ST44, ST52, ASTM A53, ASTM A106 Rectangular hollow section:1.Item: square pipe2.Standard: GB, ASTM, BS, JIS, 3.Material: Q195 ... 13.5mm5. LengthMax 13 meters6. StandardGB/T6728-2002 or ASTM A5007. OthersWe can do special orders as per the customer ... signedWe are specialized in the supply of ERW pipe, seamless steel pipe, hollow section, galvanized steel coins, steel plate, stc. We supply ...