Galvanized Square Steel Tube – Zinc-coated square tube with good corrosion resistance.
Hot-dip & Pre-galvanized Options – Suitable for indoor, outdoor and structural applications.
Custom Sizes Available – Side length, wall thickness, length and zinc coating can be customized.
Wide Applications – Used for construction, fence, greenhouse, furniture, handrail and fabrication.
Export Ready Supply – MTC, inspection support, bundle packing, FOB, CIF and CFR available.
Galvanized square steel tube is a square hollow steel section coated with a protective zinc layer. The zinc coating helps protect the steel surface from rust, oxidation and environmental corrosion, making the tube suitable for construction, outdoor structures, fencing, greenhouse frames, furniture, handrails and general industrial use.
Compared with ordinary black square tube, galvanized square tube provides better corrosion resistance and longer service life, especially in humid, outdoor or semi-outdoor environments. Its square shape also makes it easy to connect, weld, drill, cut and assemble into frames, supports and structural components.
Henan GDD supplies hot-dip galvanized square tubes, pre-galvanized square tubes and customized galvanized hollow sections for steel distributors, construction companies, greenhouse manufacturers, fencing suppliers, furniture factories, machinery manufacturers and global industrial buyers.
Product Name: Galvanized Square Steel Tube / GI Square Tube / Galvanized SHS Tube
Shape: Square / Square Hollow Section
Material Grade: Q195, Q235, Q345, Q355, ASTM A500, S235, S275, S355 or customized
Standard: ASTM, EN, JIS, BS, GB or customized
Production Type: ERW welded tube / seamless tube if required
Galvanizing Type: Hot-dip galvanized, pre-galvanized, electro galvanized
Side Length: 10×10 mm – 500×500 mm or customized
Wall Thickness: 0.6 mm – 20 mm or customized
Length: 5.8m, 6m, 11.8m, 12m or customized
Zinc Coating: 40 g/m² – 600 g/m² or customized
Surface: Bright, smooth, zinc coated, oiled or customized
End Type: Plain end, beveled end, capped end or customized
Application: Construction, fence, greenhouse, furniture, handrail, steel structure, machinery
Packing: Bundle packing, steel strips, plastic caps, waterproof packing
Trade Terms: FOB, CFR, CIF, EXW
Galvanized square steel tube is a steel tube with a square cross section and zinc-coated surface. The square shape gives the tube good structural stability, while the zinc coating improves rust resistance and surface durability.
The tube can be produced by forming and welding galvanized steel strip, or by galvanizing black square tube after welding. Hot-dip galvanized square tube usually has a thicker zinc coating and stronger corrosion resistance. Pre-galvanized square tube usually has a smoother surface and is widely used for light structures, furniture, fencing and greenhouse frames.
Because it is strong, easy to fabricate and economical, galvanized square steel tube is widely used in both construction and manufacturing industries.
Hot-dip galvanized square tube is produced by immersing the finished steel tube into molten zinc. It usually has a thicker zinc layer and better corrosion resistance, making it suitable for outdoor structures, fences, steel frames, guardrails, solar supports and long-term construction projects.
Pre-galvanized square tube is made from galvanized steel strip and then formed into square tube shape by welding. It has a smooth and bright surface, stable dimensions and good processing performance. It is commonly used for greenhouse frames, furniture, light steel structures, indoor racks and decorative frames.
Galvanized ERW square tube is made by electric resistance welding and galvanizing process. It offers stable weld quality, accurate dimensions and high production efficiency. It is widely used in construction, machinery frames, metal furniture, shelves, railings and general fabrication.
Customized galvanized square hollow sections can be supplied according to required side length, wall thickness, length, steel grade, zinc coating, surface treatment, end type and packing method.
Galvanized square steel tube is widely used in construction and industrial fabrication because it combines structural strength with corrosion protection.
In construction projects, it can be used for steel frames, roof structures, columns, beams, supports, guardrails, handrails, stair structures and temporary facilities. In fencing systems, it is commonly used as fence posts, gate frames, protective barriers and outdoor support structures.
For greenhouse and agricultural projects, galvanized square tube is suitable for greenhouse frames, plant support structures, livestock facilities, shade structures and agricultural equipment. In manufacturing industries, it can be processed into furniture frames, machinery frames, storage racks, shelves, vehicle parts, sign posts, display stands and welded metal components.
The zinc coating forms a protective layer on the tube surface, helping reduce rust and oxidation. It is suitable for outdoor, humid and general industrial environments.
The square hollow section provides stable strength and good load-bearing performance. It is suitable for frames, posts, supports, racks, barriers and structural components.
Galvanized square tube has a bright and clean surface, making it suitable for visible structures such as fences, furniture, handrails, greenhouse frames and outdoor facilities.
The tube can be cut, welded, drilled, punched, bent, threaded or assembled with connectors. It is convenient for both factory processing and on-site installation.
Side length, wall thickness, length, zinc coating, steel grade, surface treatment, end type and packing method can be customized according to customer requirements.
Compared with stainless steel square tube, galvanized square steel tube provides practical corrosion resistance at a more economical cost, making it suitable for large-volume use.
Hot-dip galvanized square tube is usually selected when the project requires stronger corrosion resistance, thicker zinc coating and longer outdoor service life. It is suitable for outdoor fences, steel structures, guardrails, solar supports and harsh environments.
Pre-galvanized square tube is usually selected when buyers need a smoother surface, lighter structure and more economical material cost. It is commonly used for greenhouse frames, furniture, indoor racks, light construction and semi-outdoor applications.
The best choice depends on the application environment, service life requirement, zinc coating requirement and project budget.
Henan GDD can supply galvanized square steel tubes with different surface and end options according to customer needs.
Common surface options include bright galvanized surface, smooth zinc surface, oiled surface, passivated surface and customized anti-rust treatment. Pipe ends can be supplied as plain ends for general fabrication, beveled ends for welding preparation, capped ends for protection, or customized ends according to drawings.
Plastic caps, bundle labels, waterproof wrapping, customer marks and special export packing can also be arranged.
Henan GDD is a reliable steel material supplier with experience in steel pipe supply, coated steel products, processing, inspection, packing and export service. We provide galvanized square steel tube solutions for construction companies, greenhouse manufacturers, fencing suppliers, steel structure factories, furniture manufacturers, machinery factories and global steel distributors.
We support custom sizes, different zinc coating levels, multiple steel grades, flexible packing methods and international shipment arrangements. From quotation to production, inspection, packing and loading, our team can provide one-stop export support for your galvanized tube orders.
Before shipment, Henan GDD can arrange inspection according to customer requirements. Inspection items may include side length, wall thickness, tube length, zinc coating, surface condition, straightness, end treatment, bundle quantity and total weight.
MTC, quality documents, packing photos, loading photos and third-party inspection can be provided according to order requirements. For project orders, inspection can also be arranged according to drawings, standards or buyer specifications.
Galvanized square steel tubes are usually packed in bundles with steel strips. For better protection, plastic caps, waterproof wrapping, woven bags, lifting belts, labels and customized export packing can be provided.
Standard lengths such as 5.8m, 6m, 11.8m and 12m can be arranged according to container loading requirements. Shipment can be handled by container, bulk vessel or customized logistics method depending on order quantity, tube length and destination port.
Galvanized square steel tube is used for construction, fencing, greenhouse frames, handrails, furniture, steel structures, machinery frames, racks, shelves, guardrails and general industrial fabrication.
Hot-dip galvanized square tube usually has a thicker zinc coating and better corrosion resistance. Pre-galvanized square tube has a smoother surface and is commonly used for light structures, furniture, greenhouse frames and general fabrication.
Yes. Side length, wall thickness, length, zinc coating, steel grade, surface treatment, end type and packing method can be customized according to customer requirements.
Yes. Galvanized square tube can be used outdoors. For stronger corrosion resistance and longer service life, hot-dip galvanized square tube with higher zinc coating is recommended.
Please provide side length, wall thickness, length, steel grade, galvanizing type, zinc coating, quantity, packing requirement, destination port and trade terms.
Yes. MTC, quality documents, inspection photos, packing photos, loading photos and third-party inspection can be provided according to order requirements.
Yes. In addition to galvanized square tubes, rectangular galvanized steel tubes can also be supplied according to customer size and application requirements.
Looking for galvanized square steel tubes for construction, fencing, greenhouse or industrial fabrication?
Send us your required side length, wall thickness, length, zinc coating, quantity and destination port. Henan GDD will provide a professional quotation and suitable shipping solution.
