We manufacture heavy-duty carbon steel square hollow sections (SHS) designed to deliver superior torsional rigidity, excellent compression resistance, and reliable weldability for structural applications.
| Specification | Technical Parameters |
| Global Standards | AISI, ASTM, BS, GB |
| Structural Grades | Q195, Q215, Q235, Q235b, Q345, Q355b, A36, SS490, SM400, SM490 |
| Carbon & Alloy Grades | 10#, 20#, 45#, S25C, S35C, S45C, 65Mn |
| Technology | Cold Rolled / Hot Rolled |
| Shape Profile | Square (Square Hollow Section - SHS) |
| Outer Dimensions | 10×10 mm - 600×600 mm (Or highly customised) |
| Wall Thickness | 1 mm - 200 mm (Engineered for heavy-wall requirements) |
| Length | 1 meter - 12 meters (Precise cut-to-length available) |
| Surface Finish | Natural colour, iron grey, or anti-rust painted |
Our structural square tubes are manufactured to strict metallurgical standards, ensuring optimal yield stress for high-load frameworks. Technical data for core Q-Series grades:
| Grade | C≤ (%) | Si≤ (%) | Mn≤ (%) | P≤ (%) | S≤ (%) | Tensile Strength (MPa) | Yield Stress (MPa) | Elongation (%) |
| Q235B | 0.20 | 0.28 | 0.7 | 0.025 | 0.025 | 380 - 450 | 270 - 300 | 28 |
| Q345B | 0.20 | 0.50 | 1.6 | 0.034 | 0.025 | 550 - 600 | 380 - 450 | 25 |
| Q355B | 0.24 | 0.55 | 1.6 | 0.035 | 0.025 | 550 - 630 | 380 - 450 | 21 |
With uniform geometry and thick wall capabilities (up to 200mm), our carbon steel square tubes are the baseline material for:
Infrastructure & Construction: Building frameworks, heavy architectural supports, and commercial warehouse racking.
Mechanical Fabrication: Heavy machinery bases, agricultural equipment frames, and automotive chassis components.
Safety & Infrastructure: Highway guardrails, bridge support structures, and industrial safety barriers.
As a direct manufacturing source, we provide scalable structural steel supply chains for engineering contractors, OEM fabricators, and metal wholesalers worldwide. Please submit your required material grade (e.g., Q355B Square Tube), exact dimensions (Width × Width × Wall Thickness × Length), surface requirements, and total metric tonnage to receive an official factory-direct price and MOQ details.
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