It is a square tube type. Many kinds of materials can form a square tube. Most square tubes are made of steel tubes. Welded into a round pipe, then rolled from the round pipe into a square pipe, then cut to the desired length. Usually, there are 50 square tubes per package. In terms of inventory, large specifications are 10*10*0.8-1.5~500*500*10-25. Square steel tubes can be used in everything from small and simple structures (road signs and traction lathes) to large and complex structures (used to support skyscrapers and Bridges). It has three advantages: high cost performance, high strength and uniformity.Shandong Zhongao Steel Co. LTD. is a large-scale iron and steel enterprise integrating sintering, iron making, steel making, rolling, pickling, coating and plating, tube making, power generation, oxygen production, cement and port. The main products include sheet (hot rolled coil, cold formed coil, open and longitudinal cut sizing board, pickling board, galvanized sheet), section steel, bar, wire, welded pipe, etc. The by-products include cement, steel slag powder, water slag powder, etc. Among them, fine plate accounted for more than 70% of the total steel production.We offer round, square and shaped welded steel tubes. Material, size can be selected according to customer needs. We also provide surface treatment services: A. sanding B.400#600# mirror C. Hairline drawing D. tin-titanium E.HL wire drawing and mirror (2 finishes for one tube). 1. Hot rolling, cold rolling or cold drawing technology. 2. Hollow section, lighter weight, higher pressure. 3. High hardness, strength, wear resistance and corrosion resistance. 4. SMLS can be cut, threaded or slotted. Coating methods include black/red paint, varnish, hot dip galvanizing, etc.1. 2 layer PE foil protection; 2. After binding and making, cover with polyethylene waterproof cloth; 3. Thick wood covering; 4. LCL metal pallet to avoid damage, wooden pallet full load; 5. According to customer requirements.