Factory direct sale GI pre-galvanized square and rectangular hollow section steel pipe is widely used in structural engineering, building frameworks, machinery fabrication, and furniture manufacturing. Made of high-quality mild steel (Q195–Q345 or ASTM A36), the tube is formed by precision welding and pre-galvanized to achieve a uniform zinc coating that provides excellent corrosion and rust protection.

The smooth surface and bright appearance make it ideal for both indoor and outdoor applications. The zinc layer thickness ranges from 40–275g/m², effectively extending service life in humid or industrial environments. Its hollow structure offers light weight, high strength, and easy installation advantages compared with solid bars or hot-rolled sections. It can be easily welded, cut, drilled, and powder-coated without damaging the protective layer.

Available in square and rectangular shapes, sizes range from 10×10mm to 300×300mm, with wall thicknesses from 0.8–12mm. All products comply with ASTM, EN, and GB standards and undergo dimensional inspection, coating test, and mechanical property verification before shipment. Standard lengths are 6m or 12m, and custom cutting or punching service is available upon request.

Every tube is packed with waterproof paper, plastic film, and steel straps for export shipment. With factory direct sales, we guarantee competitive prices, steady inventory, OEM logo printing, and professional logistics service. GI pre-galvanized steel tubes are a reliable, cost-effective choice for construction, greenhouse structures, fencing systems, and general engineering applications worldwide.