A high-strength and high-conductivity aluminum alloy wire for electrical use and its manufacturing method

Abstract

The invention provides a high-strength and high-conductivity aluminum alloy wire for electrical use and a manufacturing method thereof. In terms of weight percentage, the aluminum alloy includes the following components: Si: 0.50-0.70%, Fe: 0.10-0.50%, Cu: 0.02~0.05%, Mg: 0.52~0.90%, Ti: 0.01~0.40%, the balance is aluminum and unavoidable impurities, the aluminum alloy wire made, its longitudinal tensile strength ≥ 380MPa, conductivity at 20 ℃ ≥ 63% IACS, 250mm gauge length after break elongation ≥ 4.0%, can be widely used in overhead transmission lines.

Description

technical field [0001] The invention relates to a new manufacturing process of electrical materials for overhead wires, in particular to a high-strength and high-conductivity aluminum alloy wire for electrical use and a manufacturing method thereof. Background technique [0002] At present, ordinary steel-cored aluminum stranded wires are widely used on overhead transmission lines in my country. With the continuous increase of the national power demand, especially the development of the national grid to UHV and EHV lines, at the same time, it advocates the demand for "resource-saving, environment-friendly and new technologies, new materials, and new processes" for smart grids, and actively uses them New materials, new wires. Due to the low tensile strength of ordinary aluminum materials, aluminum core aluminum stranded wire and aluminum clad steel stranded wire must be supplemented with a steel core or aluminum clad steel core with hysteresis loss in the structural design, ...

AI Technical Summary

Problems solved by technology

Due to the low tensile strength of ordinary aluminum materials, aluminum-core aluminum stranded wire and aluminum-clad steel stranded wire must be supplemented with a steel core or aluminum-clad steel core with hysteresis loss in structural design, which not only increases the weight of the wire, but also increases the transportation. Cost, and higher towers and stronger towers are needed, which not only covers a large area of ​​the line corridor, but also increases the line operation loss and reduces the transmission capacity

[0003] Chinese patent CN201621328908 discloses a high-conductivity aluminum stranded wire with an aluminum alloy core. The conductivity of the outer aluminum wire is only 62.5% IACS, and the inner layer uses a 6201 aluminum alloy core with a conductivity of 53% IACS. Although this structure avoids magnetic Steel core or aluminum-clad steel core with hysteresis loss effect, but the tensile strength of aluminum wire is ≤200MPa, and the tensile strength of aluminum alloy wire is ≤330MPa. The performance resistivity and tensile strength of the combined wire are still low, and the line loss is large

[0004] Chinese patent CN201410774396 discloses a production method of high-strength, high-conductivity aluminum alloy wire, but the tensile strength of the aluminum alloy wire is 330-365MPa, the conductivity is 56-58% IACS, and the resistivity and tensile strength are still low, high line loss

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