Square & Rectangular Tube
High-Strength Structural Steel Tubes · Factory Direct Export · For Construction & Engineering
Overview
Square and rectangular tubes precision-manufactured from high-quality carbon steel to meet the demanding requirements of modern construction, manufacturing, and infrastructure. The robust hollow cross-section delivers excellent load-bearing capacity while optimizing material utilization — the preferred choice for structural frames, support systems, and custom fabrication worldwide.
Key Advantages
Superior Structural Performance
The square/rectangular cross-section distributes loads evenly, with bending and torsion resistance superior to round tubes. High strength-to-weight ratio reduces project weight without compromising safety. Tight tolerances (±0.2mm) and straightness (<1.5mm/m) simplify on-site assembly.
Durable & Versatile
Hot-dip galvanized options provide long-term protection (zinc ≥85μm) in outdoor, humid, and coastal environments. Easy to cut, drill, weld, and bend for custom frames, brackets, and structural parts. Used in steel structures, solar mounting, agricultural greenhouses, machinery, storage racks, and architectural decoration.
Factory Direct — Quality & Supply Assured
Strict QC on every batch: weld, dimension, and material inspection with MTC provided. 200+ standard sizes in stock for fast delivery. Exported to 30+ countries with professional packaging and sea/air logistics support.
Specifications
- Square Tube
- 20×20mm – 500×500mm
- Rectangular Tube
- 30×50mm – 400×200mm (custom available)
- Wall Thickness
- 1.2mm – 10mm (standard); heavy-duty up to 20mm
- Length
- 6m (standard), 11.8m/12m; cut-to-length 6m–18m
- Material
- Q235B (general), Q355B/S355JR (high-strength)
- Surface Treatment
- Black (mill finish), hot-dip galvanized, pre-galvanized/painted, oiled
- Standards
- GB/T 6728, GB/T 3094; CE, ISO, API export certs available
Applications
Construction
- Steel structures, column supports, curtain wall brackets, stair railings
Energy & Infrastructure
- Solar PV mounting, highway guardrails, bridge components, utility pole bases
Agriculture
- Greenhouse frames, livestock shed structures, irrigation pipe supports
Industrial Manufacturing
- Heavy equipment bases, machine tool frames, conveyor system components
Commercial & Residential
- Decorative partitions, furniture frames, balcony railings
Why Choose Us
- 01
Safe Packaging: Steel strapping + waterproof film + wooden pallets to prevent transit damage
- 02
Convenient Logistics: Adjacent to port for efficient sea freight; reliable door-to-door service available
- 03
Custom Services: OEM/ODM supported; laser cutting, punching, marking and other fabrication available
- 04
Ample Stock: 200+ standard sizes ready for fast order fulfillment
Need a Quote or Technical Advice?
Our engineering team will respond within 24 hours.