... 400x400mm. TCT:0.6-16.0mm steel mill 1)Material: Q195/Q215/Q235,20#,45 ... Product Type: Square pipe, Rectangular tubes, ERW tubes, Seamless &Welded steel pipe, Galvanized steel pipe, etc. 6)Usage ... traffic andcommunication, and so on. Square Pipe Product nameSquare PipeSpecification20mm*20mm-400m*400mmMaterial of ... can do processing to the Square Pipe. SHS pipe/RHS/Hollow section/Pipes Export license ...