Zinc-plating-free high-strength angle steel and production method thereof

Abstract

The invention discloses galvanizing-free high-strength angle steel and a production method thereof, and belongs to the technical field of metallurgy. The angle steel comprises the following chemical components in percentage by weight: 0.09 to 0.12 percent of C, 1.00 to 1.20 percent of Mn, 0.50 to 0.60 percent of Si, 0.05 to 0.07 percent of V, 0.50 to 0.60 percent of Cr, 0.40 to 0.50 percent of Ni, 0.25 to 0.30 percent of Cu, less than or equal to 0.010 percent of S, 0.008 to 0.020 percent of P, 0.0060 to 0.0120 percent of N and the balance of Fe and inevitable impurities. The production method comprises the working procedures of converter smelting, LF refining, continuous casting, heating, rolling, cooling and sawing and sizing. The angle steel is high in strength and good in toughness, the corrosion resistance index is larger than or equal to 6.7, galvanizing for corrosion prevention is not needed, the angle steel can be directly used, and the cost of iron tower manufacturers is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a galvanized-free high-strength angle steel and a production method thereof. Background technique [0002] At present, my country's power energy ultra-high voltage and ultra-high voltage transmission line construction projects are booming, and power transmission requires a large number of transmission towers. These transmission towers are usually assembled with steel tower angle steel after processing and galvanizing. On the one hand, as the transmission power increases, the strength of the required iron tower angle steel is also increasing. On the other hand, because the transmission towers often span complex geographical environments such as mountains, rivers, etc., galvanizing and anti-corrosion are required to ensure the life of the tower structure. The galvanized angle steel will not only increase the cost of iron tower manufacturing, but also have stricter ...

AI Technical Summary

Problems solved by technology

The galvanized angle steel will not only increase the cost of iron tower manufacturing, but also have stricter environmental protection requirements

[0003] At present, Q235, Q345 and Q390 hot-rolled angle steels below No. 20 are mainly used as angle steels for power towers in China. There are problems such as small thickness, low strength and low quality grades of angle steels for power towers, which make it necessary to construct UHV transmission towers. The use of double or multiple combined angle steels brings a series of problems such as uneven stress and easy damage to angle steels, difficult construction of bolted connections, poor safety of adding filling plates, and high processing and installation costs.

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