Carbon steel square tube is a hollow structural section with a square cross-section, produced from carbon steel containing controlled amounts of manganese, silicon, phosphorus and sulfur. Both welded and seamless variants are available. The simple manufacturing process keeps production costs low, making square tube an economical choice for a wide range of industrial uses. Typical applications include building structures, mechanical fabrication, highway infrastructure, bridges and general pipeline support. The product can be supplied with bright, polished or black surface finishes and combined with optional services such as CNC machining, grinding, heat treatment, annealing, pickling, polishing, rolling, forging, cutting and bending to meet specific project requirements.
Technical specifications
| Standard | EN/DIN/JIS/ASTM/BS/ASME/AISI |
| Diameter (mm) | 15x15 mm - 400x600 mm (square/rectangular) |
| Wall thickness (mm) | 1.65-65 mm (welded); 1.25-50 mm (seamless) |
| Steel grade | Carbon steel |
| Length (m) | 3-12 m (customizable) |
| Coating | Bright, polished or black |