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Hollow Section Pipes of Building Material (Square & Rectangular)
Hollow section pipes are the cornerstone of modern structural building materials. Our Square and Rectangular hollow sections are specifically engineered for critical applications in construction, engineering, and infrastructure projects.
With a focus on structural integrity, these tubes are widely used in building frameworks, low-pressure liquid delivery, and agricultural greenhouses. We offer a versatile range of finishes, including Hot-Dipped Galvanized for extreme acid and rust resistance, and Pre-galvanized options for cost-effective anti-corrosion protection. Our building material pipes ensure high performance and a significantly extended service life in demanding environments.
Technical Specifications
| Category | Details & Specifications |
| Product Name | Square & Rectangular Hollow Section |
| Size Range | 20×20mm – 400×400mm |
| Wall Thickness | 0.6mm – 10mm |
| Standard | ASTM A500, EN 10210, GB/T 3094 |
| Material Grade | Q195, Q235, Q345, S235, S355, STK500, A53 GR A/B |
| Surface Finish | Hot Dipped Galvanized, Pre-galvanized, Black, Oiled |
| Zinc Coating | HDG: 180–600g/m²; Pre-galvanized: 40–120g/m² |
| Manufacturing Method | Hot Rolled or Cold Rolled |
| Length | 1m – 12m |
Material & Mechanical Properties
Chemical Composition (%)
| Material | C% | Mn% | S% | P% | Si% |
| Q195 | 0.06-0.12 | 0.25-0.50 | <0.05 | <0.045 | <0.3 |
| Q235 | 0.12-0.2 | 0.30-0.70 | <0.045 | <0.045 | <0.3 |
| Q345 | <0.20 | 1.0-1.6 | <0.04 | <0.04 | <0.55 |
Mechanical Property
| Material | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| Q195 | >195 | 315-430 | 32-33 |
| Q235 | >235 | 375-500 | 24-26 |
| Q345 | >345 | 470-630 | 21-22 |
Key Performance Advantages
Product Applications
Construction & Architecture: Structural frameworks, columns, and beams for high-rise buildings.
Engineering: Heavy-duty structural components for machinery and bridge engineering.
Infrastructure: Robust fencing, highway barriers, and steel door/window frameworks.
Infrastructure: Robust fencing, highway barriers, and steel door/window frameworks.
Fluid Delivery: Low-pressure liquid transportation for water and gas systems.
Packaging & Delivery
Frequently Asked Questions (FAQ)
Q: Why is the zinc coating weight important for building materials?
A: Higher zinc weight (like our 180-600g/m² HDG) provides a thicker barrier against corrosion. This is critical for structural steel that will be exposed to outdoor elements for 20+ years.
Q: Do you provide mill test certificates for Q345 or S355 materials?
A: Yes, we provide full traceability with Mill Test Certificates (MTC) showing the exact chemical composition and mechanical properties of each batch.
Q: What is the difference between pre-galvanized and hot-dipped galvanized hollow sections?
A: Pre-galvanized (40-120g) is suitable for indoor or mild outdoor use. Hot-dipped (180-600g) is recommended for heavy-duty industrial or high-corrosion construction environments.
Q: Can these pipes be used for low-pressure liquid delivery?
A: Absolutely. Our building material hollow sections are tested for pressure resistance and are frequently used in non-critical fluid transportation.
Inventory
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