Carbon Steel Square Tube – Strong square hollow section for structural and fabrication use.
Custom Sizes Supported – Side length, wall thickness, length and surface treatment available.
Multiple Grades Available – Q195, Q235, Q355, ASTM A500, S235 and S355 supported.
Wide Applications – Used for construction, frames, fencing, furniture, racks and machinery.
Export Ready Supply – MTC, inspection support, bundle packing, FOB, CIF and CFR available.
Carbon steel square tube is a hollow steel section with a square cross section. It is widely used in construction and manufacturing because it provides good strength, stable shape, easy connection and excellent fabrication performance.
Compared with round pipe, square tube has flat surfaces that are easier to weld, drill, cut and assemble. It is especially suitable for frames, supports, posts, racks, fences, furniture structures, machinery bases and welded components.
Henan GDD supplies carbon steel square tubes in different sizes, wall thicknesses, lengths, grades and surface conditions. We support steel distributors, construction companies, steel structure factories, furniture manufacturers, machinery plants, fencing suppliers and global industrial buyers.
| Item | Specification |
|---|---|
| Product Name | Carbon Steel Square Tube / Square Steel Pipe / Square Hollow Section |
| Shape | Square / SHS |
| Material Grade | Q195, Q235, Q345, Q355, ASTM A500, ASTM A53, S235, S275, S355 or Customized |
| Standard | ASTM, EN, JIS, BS, GB or Customized |
| Production Type | ERW Welded Tube / Seamless Tube if required |
| 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 |
| Surface Treatment | Black, Oiled, Painted, Galvanized, Pickled, Anti-corrosion Coating |
| Pipe End | Plain End, Beveled End, Capped End or Customized |
| Processing Service | Cutting, Drilling, Welding, Punching, Bending, Surface Treatment |
| Inspection | MTC, Dimension Inspection, Surface Inspection, Third-party Inspection |
| Application | Construction, Steel Structure, Furniture, Fence, Machinery, Rack, Handrail |
| Packing | Bundle Packing, Steel Strips, Plastic Caps, Waterproof Packing |
| Trade Terms | FOB, CFR, CIF, EXW |
Carbon steel square tube is made from carbon steel strip, coil or plate through forming and welding processes. The steel is formed into a square hollow section and welded along the seam to create a strong and stable tube structure.
It can be supplied as black square tube, oiled square tube, painted square tube, galvanized square tube or anti-corrosion coated square tube according to the final application. For general indoor fabrication, black or oiled surface is commonly used. For outdoor environments, painted or galvanized surface is recommended.
Because carbon steel square tube is economical, strong and easy to process, it is one of the most widely used steel tube products in construction and industrial fabrication.
Black carbon steel square tube has the original steel surface after forming and welding. It is commonly used for construction, machinery frames, welded structures, racks, shelves and general fabrication. Light oil protection can be applied to reduce rust during storage and transportation.
Mild steel square tube usually refers to low carbon steel square tube, such as Q195, Q235, S235 or ASTM A500 grades. It has good weldability, formability and processing performance, making it suitable for frames, furniture, fences, handrails and light structural use.
Structural square hollow section is designed for load-bearing and structural applications. It is widely used in steel structures, columns, supports, roof frames, platforms, industrial buildings and engineering projects.
For applications requiring better corrosion resistance or surface appearance, square tubes can be painted, galvanized or coated. These options are suitable for outdoor frames, fences, guardrails, greenhouse structures and exposed steel components.
Carbon steel square tube is widely used in construction, machinery manufacturing, furniture production and industrial fabrication.
In construction projects, it can be used for steel frames, supports, columns, guardrails, handrails, roof structures, temporary facilities and welded components.
In furniture and decoration industries, square tube is commonly used for table frames, chair frames, display stands, storage racks, shelves, door frames and decorative metal structures.
For industrial manufacturing, it is suitable for machinery frames, equipment bases, vehicle parts, work platforms, agricultural equipment, fencing systems, sign posts and general metal fabrication.
It is also used in greenhouse frames, warehouse racks, safety barriers, solar mounting systems, gates, stair structures and prefabricated steel structures.
The square hollow section provides good rigidity and load-bearing performance. It is suitable for frames, supports, columns, racks and welded steel structures.
The flat surfaces make carbon steel square tube easy to weld, drill, cut, punch and connect. It is convenient for both factory fabrication and on-site installation.
Side length, wall thickness and length can be customized according to project requirements. Both light-duty and heavy-duty square tubes can be supplied.
Carbon steel square tube can be cut, bent, welded, drilled, punched, painted, galvanized and processed into many finished products.
Black surface, oiled surface, painted surface, galvanized surface and anti-corrosion coating can be selected according to indoor or outdoor use.
Compared with stainless steel square tube, carbon steel square tube offers strong mechanical performance at a more economical cost, making it suitable for large-volume production and construction use.
Carbon steel square tube usually refers to black or oiled square steel tube without zinc coating. It is suitable for indoor structures, welded fabrication, machinery frames and applications where later painting or coating will be applied.
Galvanized square tube has a zinc-coated surface and provides better corrosion resistance. It is more suitable for outdoor structures, fences, greenhouse frames, handrails and humid environments.
For cost-sensitive indoor applications, carbon steel square tube is often a practical choice. For outdoor or long-service applications, galvanized square tube is recommended.
Henan GDD can supply carbon steel square tubes with different surface treatments and processing services. Common surface options include black surface, light oiled surface, painted surface, pickled surface, galvanized surface and anti-corrosion coating.
Processing services can include cutting to length, drilling, punching, welding, bending, beveling, end capping and custom fabrication according to drawings. Customer marks, labels, bundle packing and special export packing can also be arranged.
Henan GDD is a reliable steel material supplier with experience in steel pipe supply, structural steel products, processing, inspection, packing and export service. We provide carbon steel square tube solutions for construction companies, steel structure factories, machinery manufacturers, furniture factories, fencing suppliers, distributors and global industrial buyers.
We support custom sizes, multiple steel grades, flexible surface treatments, cutting service, inspection documents and international shipment. From quotation to production, inspection, packing and loading, our team can provide one-stop export support for your square tube orders.
Before shipment, Henan GDD can arrange inspection according to customer requirements. Inspection items may include side length, wall thickness, tube length, surface condition, weld seam appearance, straightness, end treatment, bundle quantity and total weight.
For project orders, additional inspection can be arranged according to ASTM, EN, JIS, GB or customer specifications. MTC, quality documents, inspection photos, packing photos, loading photos and third-party inspection reports can be provided according to order requirements.
Carbon steel square tubes are usually packed in bundles with steel strips. Plastic caps, waterproof wrapping, lifting belts, labels, customer marks and customized export packing can be provided if required.
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.
Carbon steel square tube is used for construction, steel structures, machinery frames, furniture, fences, racks, shelves, handrails, greenhouse frames and general industrial fabrication.
Carbon steel square tube usually has a black or oiled surface and is suitable for indoor or further coated applications. Galvanized square tube has a zinc coating and provides better corrosion resistance for outdoor use.
Yes. Side length, wall thickness, length, steel grade, surface treatment, pipe end and packing method can be customized according to customer requirements.
Yes. Black, oiled, painted, galvanized, pickled and anti-corrosion coated surfaces can be supplied according to application environment and project needs.
Please provide side length, wall thickness, length, steel grade, surface treatment, 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 carbon steel square tubes, rectangular steel tubes can also be supplied according to customer size, grade and application requirements.
Looking for carbon steel square tubes for construction, furniture, frames or industrial fabrication?
Send us your required side length, wall thickness, length, surface treatment, quantity and destination port. Henan GDD will provide a professional quotation and suitable shipping solution.
