... pipe, Rectangular tubes, ERW tubes, Seamless &Welded steel pipe, Galvanized steel pipe, etc.hollow rectangular steel tube Product name hollow rectangular steel ... the Gi Square Pipe3m-12mProcessing techniquecoupling, necking, punching and so on.Usage industryPetrol, gas, water pipe,construction, ... pipe: cold rolled, hot rolled, hot dipped, ERW pipe and so on.We sincerely hope to establish business ...