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Telescopic Flange 18m Heavy-Duty Transmission Steel Pole 30-Year Service Life 3mm Zinc Thickness Q420B
Product Details:
| Place of Origin: | Jiangsu, China |
| Brand Name: | ECER Steel Pole |
| Certification: | ISO 9001:2015, ISO 1461, ISO 3834 Welding |
| Model Number: | ESP-FL-18M-HD |
Payment & Shipping Terms:
| Minimum Order Quantity: | 1 Piece |
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| Price: | USD 800-1800 / Piece |
| Packaging Details: | Custom steel transport frames with bolted saddles, VCI anti-corrosion wrapping, ISPM 15 certified timber dunnage |
| Delivery Time: | 30-45 working days |
| Payment Terms: | T/T, L/C at sight |
| Supply Ability: | 800 Pieces per Month |
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Detail Information |
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| Material: | Q420B High-Strength Steel | Height: | 18 Meters |
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| Shape: | Dodecagonal Tapered | Voltage Level: | 132kV / 220kV |
| Connection Type: | Bolted Flange (M24 Grade 10.9 Bolts) | Surface Treatment: | Hot-Dip Galvanized + Sealant |
| Zinc Coating Thickness: | ≥3mm (2100g/m² Typ.) | Wind Speed Rating: | 220 Km/h |
| Top Diameter: | 300mm | Bottom Diameter: | 650mm |
| Wall Thickness: | 8-16mm | Base Plate: | 1000x1000x40mm With 16 Anchor Bolts M36 |
| Highlight: | Telescopic Flange steel pole heavy-duty,Transmission steel pole 30-year service life,Electric steel pole 3mm zinc thickness |
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Product Description
Telescopic Flange 18m Heavy-Duty Transmission Steel Pole
Product Overview
The ESP-FL-18M-HD is our premier heavy-duty transmission pole engineered for 132kV and 220kV bulk power corridors. This 18-meter structure features bolted flange connections between telescopic sections, a 3mm minimum zinc coating thickness for extreme environmental protection, and a 30-year design service life verified through accelerated corrosion testing. Fabricated from Q420B steel with full-penetration welds per ISO 3834.
Key Features
- Bolted Flange Connections: Each section terminates in a machined flange ring with M24 Grade 10.9 high-strength bolts, enabling modular transport and on-site assembly without welding
- 3mm Zinc Coating: Exceptionally thick hot-dip galvanized layer (2100g/m²) delivering 30+ years of corrosion protection in C5-M (very high marine/industrial) environments per ISO 12944
- 30-Year Design Life: Fatigue analysis per IEC 60826 for 10⁷ wind-induced vibration cycles, combined with corrosion allowance modeled per ISO 9223 for the specified environment class
- Q420B Steel Core: High-strength structural steel (420 MPa yield) allowing slimmer sections and reduced foundation loads without compromising ultimate capacity
- Full-Traceability Manufacturing: Every steel plate heat-number-traceable to mill certificates; every weld mapped to qualified WPS/PQR per ISO 15614
Technical Specifications
| Parameter | Value |
| Rated Voltage | 132kV / 220kV |
| Structure Height | 18m (3 sections: 6m+6m+6m) |
| Zinc Mass | ≥2100 g/m² (≈3mm thickness) |
| Flange Bolts | M24 Grade 10.9 HDG (16 per flange) |
| Wind Speed | 220 km/h (3-sec gust) |
| Transport Sections | 3 sections, max 6m each |
Applications
Purpose-built for 132kV and 220kV bulk transmission lines, cross-country interconnectors, substation busbar support structures, and critical infrastructure corridors where 30+ year uninterrupted service is mandatory. Suitable for coastal, desert, tropical, and heavy industrial environments.
Lifecycle Engineering
Each ESP-FL pole ships with a comprehensive documentation package: certified mill test reports, welding procedure qualification records, NDT reports (100% UT on full-pen welds), galvanizing thickness measurements, dimensional as-built records, and a 10-year material warranty with optional extended warranty program.
