Galvanized Square & Rectangular Steel Tube is a high-quality hollow steel section with a zinc coating that provides excellent corrosion resistance, durability and long service life. It is widely used in construction, structural projects, greenhouse frames, fencing, machinery and industrial applications. As a professional galvanized steel tube manufacturer and supplier, we provide galvanized square tubes and rectangular tubes in various sizes, wall thicknesses and lengths. Our products are available in steel grades including Q195, Q235, Q345, ASTM A500 and other equivalent materials, manufactured according to international standards such as ASTM, EN, DIN, JIS, GB, ISO and BS. With high strength, accurate dimensions, smooth surface and good weldability, galvanized square and rectangular tubes are suitable for both indoor and outdoor applications. The hot dip galvanized coating effectively protects the steel from rust and weather damage, reducing maintenance costs and extending service life. We offer customized galvanized hollow sections with different specifications, zinc coating requirements and surface treatments. With strict quality control and professional export experience, we provide reliable galvanized square and rectangular steel tube solutions for customers worldwide.








■ Product Parameters
Item | Specification |
Product Name | Galvanized Square & Rectangular Steel Tube / GI Square & Rectangular Tube |
Standards | ASTM, EN, DIN, GB, ISO, JIS, BS, ANSI, etc. |
Material Grade | Q195, Q235, Q345, 10#–45#, ASTM Gr.A, Gr.B, Gr.50, DIN S235JR, JIS SS400, JIS SPHC, BS 040A10, etc. |
Shape | Square, Rectangular |
Outer Size | 10 × 10 mm – 450 × 450 mm (Custom sizes available) |
Wall Thickness | 0.6–25 mm or according to customer requirements |
Length | 5.5 m, 5.8 m, 6 m, 11.8 m, 12 m, or customized |
Surface Treatment | Pre-Galvanized: Zinc coating 20–275 g/m²Hot-Dip Galvanized: Zinc coating 180–500 g/m² |
Manufacturing Process | High-Frequency Electric Resistance Welded (ERW), Cold Formed, Hot Rolled |
Ends | Plain End, Beveled End, or Threaded (Optional) |
Inspection | Chemical Composition, Mechanical Properties, Dimensional Inspection, Zinc Coating Thickness Inspection |
Applications | Construction, Steel Structures, Furniture Manufacturing, Interior Decoration, Greenhouse Frames, Fence & Handrail Systems, Fluid Transportation, Agricultural Irrigation, Solar Mounting Systems, Mechanical Engineering |
Package | Standard export seaworthy packing:• Bundles fastened with steel strips• Wrapped with plastic film if required• Or according to customer's requirements |
Delivery Time | According to order quantity, typically 7–20 days after receiving the deposit. |
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■ FAQ
Q: Are you a trading company or a manufacturer ?
A: We are manufacturer. Every month, we do a procurement for a massive number of steel material from Chinese state owned mill. The total value of steel processing equipment is more than 30 million dollars. Our major products cover all category of steel industry, and it is totally compatible to all kind of world steel standard.
Q: Do you have large amount of steel products in stock ?
A: Yes, we do. In large-scale indoor warehouses, the total stock value is over 150 millions dollar.
Q: Do you provide the samples ? Free or Extra ?
A: It is free, depend on the value of the sample. The cost of the freight would be charge.
Q: How long is the delivery time ?
A: Officially, it is within 7 days. Actually, we can deliver within 3 days. Customized products or non-standard size products would be taken 10-30 days to deliver, depend on the production cycle. Generally, most of the products finished and delivered within 20 days.
Q: Do you accept the third party inspection ?
A: Absolutely yes!
Q: How could you guarantee your products ?
A: Each batch of products must have its own factory inspection report. If the third-party inspection report of the product you purchased does not match our factory inspection report, we will resend the goods, and we will carry all the costs by ourselves.
Q: How can I get your quotation as soon as possible ?
A: You may have many methods to contact us. Email and fax will be checked within 12 hours, and Skype, WeChat and WhatsApp will be online in 24/7. Please send us your requirement, attaching specification (Steel grade, dimension, quantity, destination port) or any you are concerned, you will obtain a competitive price and supply solution soon.
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