... to standards:Product Name:Galvanized Square Steel PipeSize:15*15-400*200Shape:square , rectangularSteel Standard:GB, GB/T11263- ... Terms:30%TT deposit,70%TT before shipment.Galvanized Square Steel Tube Specifications :Steel tube uses include construction, ... , highway railings, housing construction, pressure vessels, oil storage tanks, bridges, power plant equipment, material handling equipment and other ...