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65FT Q420B High Strength Galvanized Electric Steel Pole with 1200KGF Load Rating for 110KV Transmission
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| เน้น: | 65FT Q420B transmission pole,octagonal galvanized steel pole,1200KGF high strength electric pole |
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65FT Q420B High Strength Octagonal Galvanized Electric Steel Pole 1200KGF for 110KV Transmission
Yixing Hongxin Illumination Facilities Co., Ltd. introduces the 65FT Q420B high-strength octagonal galvanized electric steel pole, rated at 1200KGF for 66KV-110KV transmission and heavy-duty substation structures. This pole represents Hongxin's premium transmission-class offering, utilizing Q420B high-strength low-alloy steel with a minimum yield strength of 420 MPa—approximately 70% higher than standard ASTM A36 material. The exceptional strength-to-weight ratio enables optimized section designs that achieve 1200KGF load ratings with manageable section weights, simplifying transportation and erection logistics for tall transmission structures. As a direct manufacturer with over 25 years of specialized production history, Hongxin provides complete process control from Q420B plate procurement through robotic welding, hot-dip galvanization, and final load testing.
Key Features
- Q420B Ultra-High-Strength Steel: With 420 MPa minimum yield strength, this grade enables slender, material-efficient pole designs that reduce total steel consumption by up to 25% compared to Q345B alternatives, lowering both material costs and foundation loads.
- 1200KGF Transmission Rating: Engineered for 110KV transmission lines, long-span river crossings exceeding 300 meters, and substation gantry structures where wind and short-circuit loads demand exceptional mechanical capacity.
- Four-Section Flange System: Four precision-machined, bolted flange connections enable the 65FT height to be shipped in standard 40FT containers while maintaining rigid structural continuity through all joint interfaces.
- Finite Element Optimized: Wall thickness distribution along the pole height is optimized through computational structural analysis, placing material where bending moments peak and minimizing weight in lightly loaded upper sections.
- Fatigue-Resistant Welding: Robotic submerged arc welding with controlled heat input and post-weld inspection ensures joint integrity under decades of cyclic wind loading, critical for tall transmission structures.
- Prototype Load Testing: Pole design is validated through full-scale cantilever load testing to 150% of rated capacity, providing verified safety margins beyond analytical predictions alone.
Technical Specifications
| Parameter | Specification |
|---|---|
| Height | 65FT (19.81 meters) |
| Material | Q420B (420 MPa minimum yield) |
| Shape | Octagonal (8-sided) tapered |
| Wall Thickness | 5.0mm - 8.0mm |
| Design Load | 1200KGF |
| Surface Treatment | Hot-dip galvanization, ISO 1461 |
| Connection Type | Bolted flange (4 sections) |
| Zinc Coating Thickness | ≥ 85μm average |
| Applicable Voltage | 66KV / 110KV |
| Prototype Test | 150% rated load verification |
Applications
The 65FT Q420B transmission pole is engineered for 110KV overhead transmission lines, long-span river and valley crossings, substation entry gantries, and wind farm collector substation structures. The combination of ultra-high-strength Q420B steel and four-section flange assembly makes it suitable for remote project sites where transport logistics favor containerized shipping and on-site assembly with mobile cranes. The pole accommodates twin and quad bundle conductor configurations, OPGW earth wires, and all standard 110KV substation hardware. Custom structural engineering for complex loading cases including simultaneous wind and ice, broken conductor cascading analysis, and seismic response spectrum analysis is available.
Packaging & Quality Assurance
Four sections per pole are individually wrapped, flange faces preserved with anti-corrosion treatment, and packed in heavy-duty steel-framed export crates. Documentation includes Q420B mill certificates with full mechanical and chemical properties, flange machining inspection reports, robotic weld procedure qualification records, non-destructive testing reports, ISO 1461 galvanization certificates, and prototype load test reports. Third-party inspection by SGS, Bureau Veritas, or Intertek is supported. Standard warranty: 12 months manufacturing defects. Minimum order: 5 pieces. Delivery: 40-50 days.
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