High-strength heat-resistant aluminum alloy single line and wire for smart power grid and processing process of single line

Abstract

The invention discloses a high-strength heat-resistant aluminum alloy single line and wire for a smart power grid and a processing process of the single line. The high-stretching-rate high-strength heat-resistant aluminum alloy single line is prepared from, by weight percent, 0.05%-0.15% of Zr, 0.01%-0.30% of Y or La, 0.15%-0.30% of Fe, 0.01%-0.40 of Si, 0.01%-0.50% of Mg, 0.10% or less of other impurity elements and the balance aluminum. The strength of the wire formed by stranding single lines can be greatly increased, the draw-weight ratio can be increased, and the use safety of the wire can be improved; meanwhile, the operating temperature of the wire is greatly increased, the operating temperature of the wire is increased to 150 DEG C from conventional 70 DEG C, and therefore the carrying capacity is greatly improved; and the use requirements of high-capacity and large-span extra-high-voltage lines can be met.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy wire manufacturing, in particular to a high-strength, high-elongation heat-resistant aluminum alloy single wire, wire and a processing technology thereof for smart grids. Background technique [0002] With the rapid development of my country's national economy, transmission lines are developing in the direction of high voltage, long distance and large capacity. However, the terrain in our country is complex, and most of the overhead lines have to cross rivers, rivers, hills and mountainous areas. In order to increase the transmission capacity, many transmission lines, especially many urban and rural power transmission and transformation lines, will choose heat-resistant wires. The single-wire strength of the hot wire is only that of ordinary hard aluminum. In order to improve the breaking force of the whole wire, a steel core is generally added inside the heat-resistant aluminum alloy wire ...

AI Technical Summary

Problems solved by technology

There are certain defects in this kind of stranded wire. First, the increase of the steel core leads to electromagnetic loss, which increases the line loss; second, even if the steel core is added, the weight of the whole strand increases greatly, which increases the line sag; third, Even if the steel core is added, the entire breaking force still cannot meet the requirements of some large spans; in order to further improve the strength of the heat-resistant aluminum alloy wire, people began to develop a high-strength heat-resistant aluminum alloy wire, such as China Patent ZL2011100502625 "High-strength, high-conductivity, heat-resistant aluminum alloy wire and preparation method", the tensile strength of the high-strength heat-resistant aluminum alloy wire in this invention reaches 255MPa, and the long-term operating temperature reaches 180°C. The price is too expensive, and it is difficult to carry out large-scale application in industry. Second, because the elongation of ordinary heat-resistant aluminum alloy wire is only 1.5% to 2.0%, its fatigue resistance is poor. It is easy to break the stock phenomenon, resulting in a decrease in safety