Square tube ,hollow pipe,welded pipe carbon steel rectangular hollow section, good quality, lowest price Square tubeProduct nameSquare ... 400*400mm, WT: 0.6mm-12mmMaterial of Square PipeQ195, Q215, 20#, 10#,StandardsASTM-A53. ... Square Pipe5.8m-12mProcessing techniqueThreading, coupling, necking, punching and so on.Usage industryPetrol, gas, water pipe,construction,chimney pot.PackagingBundle,bulk in ...