Tianjin Yuantai Derun Group operates 51 high-frequency welded black pipe production lines capable of manufacturing over 600 standard specifications. Additionally, we utilize 4 specialized shape-reforming units to produce rare market-available profiles, including ultra-large diameter and extra-thick-walled square/rectangular tubes, right-angle tubes, octagonal tubes, and trapezoidal tubes. We also offer third-party tempering and annealing services. Supported by our expert technical team and advanced equipment, our next strategic objective is to pioneer the development of direct-formed specialty tubing solutions.
I. Production Specifications & Compliance Standards
Shaped Redrawing Tubes:
Square Tubes: 80×80mm to 1200×1200mm
Rectangular Tubes: 50×100mm to 1200×1500mm
Wall Thickness: 2.75mm–50mm
Standard: GB/T 3091-2015 (Structural Steel Tubes for Fluid Transportation)
Customizable Materials: Q235, Q355, Q390, Q420, Q460, high-strength steel, weather-resistant steel, and other alloys.
Innovative Hot-Rolled Right-Angle Tube Technology:
Our advanced manufacturing process combines:
In-line hot rolling of 4 corners
Full-profile heating
This dual approach achieves energy-efficient operations and high-throughput production.
Depicted: 300mm×300mm×14mm Right-Angle Tube
Depicted: 150mm×400mm×25mm Right-Angle Tube
Depicted: 120mm×400mm×20mm Right-Angle Tube
Depicted: 80mm×240mm×20mm Right-Angle Tube
II. Production Process Flow
Raw Material Inspection – Round pipe verification
Loading – Automated feeding system
Hydraulic Pushing – Precision alignment
Roll Forming Extrusion – Circular-to-square transformation
Geometric Inspection – Dimensional accuracy, flatness, perpendicularity, radius (R-angle)
Unloading & Straightness Check – Torsion/twist detection
Port-End Calibration – Eliminating deformation zones from forming process
Saw Cutting & Edge Trimming – Precision length control
Final Marking & Quality Certification – Laser spray labeling
Warehousing – Systematic inventory management
III. Advanced Processing Capabilities
Tianjin Yuantai Derun Group’s newly commissioned intelligent tempering furnace addresses critical stress relief requirements through:
Artificial Aging Techniques
1. Thermal Stress Relief
Heating steel tubes to 550-650°C for stress relief annealing offers:
Time efficiency: 80-90% faster than natural aging
Comprehensive stress elimination: Up to 98% residual stress reduction
Microstructural optimization: Enhanced grain boundary alignment
2. Vibratory Stress Relief (VSR)
Our advanced vibration aging system operates through:
① Resonance activation: Matching workpiece’s natural frequency (20-200Hz range)
② Energy superposition: Combining alternating stresses (5-50MPa) with residual stresses
③ Energy dissipation: Molecular friction absorption at critical thresholds (0.1-0.3% strain)
④ Stress homogenization: Achieving 70-85% stress reduction through viscoelastic-plastic deformation
Post-Treatment Performance Enhancement
S&R tubes processed with these methods demonstrate:
✓ 15-25% improvement in yield strength (Q355: ≥355MPa → 410MPa)
✓ 10-18% increase in tensile strength (510-680MPa range)
✓ 5-8% enhanced elongation at break (δ₅ ≥24%)
✓ 30% higher impact compressive resistance (KU₂ ≥60J at -20°C)
This synergistic engineering approach creates performance characteristics exceeding conventional arithmetic summation – a true industrial “1+1>2” effect..
Depicted: 500×500×40mm Redrawn Tube Post Stress Relief Annealing
Depicted: Twist/Torsion Testing of Redrawn Tube Post Stress Relief Annealing
IV. Engineering Milestones
1.OCT Shenzhen 128m Ferris Wheel:
The primary support columns of this landmark structure incorporate Yuantai Derun’s proprietary beveled octagonal tubes, engineered to withstand extreme torsional loads while maintaining architectural precision.
2. Google Singapore Headquarters
The structural framework utilizes Yuantai Derun’s 500×500×36mm reshaped tubes manufactured from S355J2H steel (EN 10210-compliant), with a total deployment of 4,000 metric tons.
3. Sichuan Tianfu International Airport
The terminal’s structural framework incorporates Yuantai Derun’s 90×250×20mm reshaped tubes, precision-engineered to meet aviation-grade load-bearing requirements.
- AIIB Headquarters (Beijing Chaoyang)
The architectural core of this global financial hub integrates Yuantai Derun’s 500×520×22mm reshaped tubes.
- National Exhibition and Convention Center (Tianjin)
At the landmark inaugural exhibition “China Construction Science Congress & Green Smart Building Expo” on June 24, 2021, Yuantai Derun Group supplied critical structural solutions for the venue’s development:
Key Contributions:
Custom S&R Tubes:
Specifications:
200×700×8mm, 200×700×10mm, 200×700×12mm, 200×700×16mm
200×800×8mm, 200×800×10mm, 200×800×12mm, 200×800×16mm
Applications:
• Primary column systems
• Cross-bracing frameworks
