... " 2.outside diameter 60-800mm 3.wall thickness4-13mm... q235 rectangular metal pipe 1.size: 2-3/8"-13-3/8" 2 ... -1.60≤0.040≤0.040470-630345≥21 Square and Rectangular Pipe Uses: Used for machinery, processing, structure building, automobile manufacturing, shipbuilding ... , Q195, Q235, Q345 We can also supply seamless square and rectangular pipe as request . q235 rectangular metal pipe