The Large Electrical Transmission Tower is fabricated from high-tensile Q345B carbon steel with a yield strength of 345 MPa to withstand longitudinal tensions and vertical loads of several hundred kilonewtons. Every structural member undergoes a hot-dip galvanization process (ISO 1461), applying a zinc layer exceeding 86μm for a maintenance-free service life of 50 to 100 years.
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 |
Primary Utility Applications
UHV Grids: Supporting 500kV to 1000kV ultra-high-voltage backbone lines for bulk electricity transfer over distances exceeding 1,000 km.
Terrain Crossings: Engineered with reinforced sections to maintain stability over river, valley, and highway spans of 500 meters or more.
Renewable Energy Links: Connecting remote wind and solar farms to regional hubs using double or multi-circuit configurations.
Industrial Feeders: Providing dedicated high-capacity transmission for energy-intensive sectors such as mining complexes and heavy manufacturing zones.
Our Factory
Hebei Yifeng Steel Structure Co., Ltd. operates a specialized production base equipped with 12 automated CNC angle steel processing lines, ensuring a hole alignment accuracy within 0.5mm for flawless site assembly. We offer full customization for tower heights and load capacities based on regional wind speeds up to 200km/h and specific ice-loading data. By controlling the entire process from structural design to in-house galvanizing, we provide wholesale partners with stable supply chains and competitive factory-direct pricing for international projects.
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