Black Carbon Steel Square Tube – Strong square hollow section for frames and structures.
Custom Size Supply – Side length, wall thickness, length and surface treatment available.
Multiple Steel Grades – Q195, Q235, Q355, ASTM A500, S235 and S355 supported.
Easy Fabrication – Suitable for welding, cutting, drilling, punching and painting.
Export Ready Service – MTC, inspection support, bundle packing, FOB, CIF and CFR available.
Black carbon steel square hollow section tube is a welded steel tube with a square cross section. It is widely used in construction, machinery manufacturing, furniture production, fencing systems, warehouse racks, handrails, support frames and general steel fabrication.
The square profile provides stable structural support and convenient connection surfaces. Compared with round pipe, square tube is easier to align, weld, drill and assemble into frames or structural components. It is a practical choice for buyers who need strong steel tube material with economical cost and flexible processing performance.
Henan GDD supplies carbon steel square hollow sections in different sizes, grades, wall thicknesses, lengths and surface conditions. Black surface, oiled surface, painted surface, galvanized surface and customized anti-corrosion treatment can be arranged according to customer requirements.
| Item | Specification |
|---|---|
| Product Name | Black Carbon Steel Square Hollow Section Tube |
| Other Name | Carbon Steel Square Tube / Square Steel Pipe / SHS Tube |
| Shape | Square Hollow Section |
| 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, Light 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 |
Black carbon steel square tube is a square hollow steel tube with an original black steel surface. It is normally produced from carbon steel strip or coil through forming and electric resistance welding. After welding, the tube is sized, straightened, cut and packed according to order requirements.
The black surface is suitable for general fabrication, indoor structures and products that will be painted, coated or galvanized later. Light oil protection can also be applied to reduce rust during storage and transportation.
This product is commonly selected when buyers need strong structure, easy fabrication and competitive cost.
Black square steel pipe is supplied with the original steel surface. It is widely used for welded frames, construction supports, machinery structures, racks, shelves and general metal fabrication.
Mild steel square tube usually refers to low carbon steel square tube such as Q195, Q235, S235 or ASTM A500. It has good weldability and formability, making it suitable for furniture frames, fences, handrails, brackets and light structural use.
Structural square hollow section is designed for load-bearing frames and support components. It is commonly used in steel structures, columns, roof frames, platforms, factory buildings and industrial equipment supports.
For outdoor use or projects requiring better corrosion resistance, black square tubes can be painted, galvanized or coated. These options are suitable for fences, guardrails, greenhouse frames, outdoor racks and exposed steel structures.
Carbon steel square hollow section tube is widely used in construction and manufacturing industries.
In construction projects, it can be used for columns, supports, roof frames, handrails, guardrails, stair structures, temporary facilities and steel structure components.
In furniture and decoration manufacturing, it is commonly used for table frames, chair frames, display stands, shelves, metal doors, decorative frames and storage racks.
In industrial fabrication, carbon steel square tube is suitable for machinery frames, equipment bases, vehicle parts, agricultural machinery, sign posts, fencing systems, safety barriers and general welded components.
For buyers who produce finished steel products, square tube is also suitable for cutting, punching, drilling, welding, painting and further assembly.
The square hollow section provides good rigidity and stable load-bearing performance. It is suitable for frames, posts, supports, racks and structural components.
The flat sides of square tube make it convenient for welding, cutting, drilling, punching and bolted connection. It is suitable for both workshop fabrication and on-site installation.
Carbon steel square tube provides reliable mechanical performance at a lower cost than stainless steel or many special alloy materials, making it suitable for large-volume use.
Black surface, oiled surface, painted surface, galvanized surface and anti-corrosion coating can be selected according to indoor, outdoor or project-specific requirements.
Side length, wall thickness, length, grade and packing method can be customized according to different construction and manufacturing needs.
The tube can be processed into frames, brackets, shelves, fences, handrails, machinery structures and many other finished products.
Black carbon steel square tube has no zinc coating. It is suitable for indoor fabrication, machinery structures, welded frames and products that will receive painting or coating after processing.
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 general indoor manufacturing, black square tube is usually more economical. For outdoor or long-service applications, galvanized square tube is recommended.
Henan GDD can provide multiple surface and processing options according to customer requirements. Common surfaces include black steel, light oiled surface, painted surface, galvanized surface, pickled surface and customized anti-rust coating.
Processing services can include cutting to length, drilling, punching, welding, bending, end capping and surface treatment. For project orders, products can be supplied according to drawings, cutting lists or specific installation requirements.
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 producers, fencing suppliers, warehouse rack manufacturers and global steel distributors.
We support custom sizes, multiple grades, flexible surface treatment, 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 condition, bundle quantity and total weight.
For project use, inspection can also 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.
Black carbon steel square tube is used for construction, steel structures, machinery frames, furniture, fences, racks, shelves, handrails, greenhouse frames and general industrial fabrication.
Black square tube has an original steel surface and is suitable for indoor use or later painting. Galvanized square tube has 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. Carbon steel rectangular tubes can also be supplied according to customer size, grade, wall thickness and application requirements.
Looking for black carbon steel square hollow section 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.
