Material of angle steel for power tower

The angle steel material used in power towers is mainly selected based on national standards and actual engineering needs, with high strength, good corrosion resistance, and structural stability. According to the latest publicly available information (as of April 2026), the commonly used materials are as follows:

Common material grades

-Q235B: Carbon structural steel, yield strength ≥ 235 MPa, widely used in general transmission line towers, with low cost and good processing performance.

-Q345B (formerly known as 16Mn): Low alloy high-strength structural steel with a yield strength of ≥ 345 MPa, suitable for medium and high voltage transmission towers, with higher strength, balancing economy and structural safety.

-Q355B/C/D/E: A new generation of low-alloy high-strength steel, gradually replacing Q345, suitable for more harsh environments or large-span iron towers.

-Q420G/C/D: High strength steel with a yield strength of ≥ 420 MPa, used for iron towers in ultra-high pressure, heavy load or strong wind areas, which can reduce the cross-section of components and lower their own weight.

Surface treatment method

To enhance durability, angle steel is usually treated with hot-dip galvanizing to form a zinc iron alloy layer, providing full surface protection, resistance to mechanical damage, and atmospheric corrosion. Some special projects (such as coastal or acid rain areas) will use enhanced anti-corrosion processes such as zinc aluminum coatings.

Typical specifications and applications

-Common specifications include equilateral angle steel (such as 140 × 140 × 14 mm) and unequal angle steel, with sizes customized according to stress requirements.

-Large thick walled angle steel (such as 300 × 300 × 35 mm) is used as the main material for ultra-high voltage iron towers, and the material is mostly Q420 or Q355.

execution standard

The design and manufacturing of angle steel for power towers shall comply with the following national standards:

-GB/T 2694-2018 "Technical Conditions for Manufacturing Transmission Line Towers"

-GB/T 700-2023 "Carbon Structural Steel" (corresponding to Q235)

-GB/T 1591-2018 "Low alloy High strength Structural Steel" (corresponding to Q345/Q355/Q420)

In summary, Q235B, Q345B (Q355B), and Q420A are the mainstream materials for angle steel in current power towers, and the specific selection depends on the voltage level, load conditions, environmental factors, and economic requirements.