A Type Transmission Tower fabrication utilizes Q345B high-tensile steel with a yield strength of 345 MPa to manage extreme mechanical tension and lateral wind loads. Every component is treated with hot-dip galvanization to a minimum thickness of 86μm (ISO 1461), ensuring a maintenance-free service life exceeding 50 years. This design lowers wind resistance and reduces foundation concrete volume by approximately 15%, providing a significant cost advantage for large-scale grid projects.
Parameter
| Standard Category | Standard Number | Standard Name | Core function |
| Manufacturing core | GB/T 2694-2018 | Technical specifications for the manufacture of power transmission line towers | The core national standards for materials, manufacturing processes, inspection, and packaging of angle steel towers. |
| Design Core | DL/T 5486-2020 | Technical specifications for the structural design of overhead transmission line towers | Design, material selection, calculations, and construction requirements for transmission towers. |
| Construction acceptance | GB 50233-2014 | Construction and Acceptance Specifications for 110kV to 750kV Overhead Transmission Lines | Assembly, bolt tightening, grounding, and other construction requirements. |
| Material Standards | GB/T 700-2006 | Carbon structural steel | Material standards for main components such as Q235B. |
| GB/T 1591-2018 | Low-alloy high-strength structural steel | Main material standards such as Q355B/Q420 | |
| DL/T 284-2012 | Hot-rolled large-sized equal-angle steel is used for power transmission towers. | Large-sized angle steel: dimensions, properties, and testing. | |
| Corrosion protection standards | GB/T 13912-2002 | Technical requirements for hot-dip galvanized coatings on steel components | Parameters such as hot-dip galvanized coating thickness and adhesion. |
| fastener | GB/T 3098.1-2010 | Mechanical properties of fasteners: bolts, screws, and studs | Performance specifications for 4.8/6.8/8.8 grade bolts |
| DL/T 284-2012 | Hot-dip galvanized bolts and nuts for power transmission line poles and fittings. | Galvanizing and mechanical properties of bolts and nuts |
Grid Infrastructure Applications
Narrow Rights-of-Way: The compact upper structure minimizes conductor swing
Agricultural Regions: Its efficient footprint reduces land occupation, allowing for better integration into farming and rural landscapes.
Long-Distance Suspension: Primarily used as a weight-bearing suspension tower on straight-line sections of high-voltage regional grids.
Hilly and Undulating Terrain: Providing high ground clearance and structural stability for lines traversing variable elevations.
Our Factory
Hebei Yifeng Steel Structure Co., Ltd. operates 12 automated CNC angle steel production lines with a hole positioning accuracy of ±0.5mm, ensuring perfectly aligned components for rapid on-site assembly. As a direct manufacturer, we offer full customization for tower heights and load capacities based on wind speeds up to 50m/s and specific ice-loading data. By managing all fabrication and hot-dip galvanizing in-house, we provide wholesale partners with stable lead times and competitive factory-direct pricing for international utility tenders.
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