... ,20#,45# etc. Standard:ASTM,GB/T,BS Mill price Good service Square Pipe1)Material: Q195/Q215/Q235,Q345,20 ... : Galvanized or naked as customers' need;5)Product Type: Square pipe, Rectangular tubes, ERW tubes, Seamless &Welded steel pipe ... traffic andcommunication, and so on. Product nameGalvanized Square PipeSpecification20mm*20mm-200m*200mmMaterial of Square PipeQ195, Q215, 20#, 10#,StandardsASTM-A53. ...