A medium-strength aluminum alloy wire and its production process

Abstract

The invention belongs to the field of overhead power transmission technologies, and discloses an intermediate-strength aluminum alloy wire and a process for manufacturing the same. The intermediate-strength aluminum alloy wire is used for an overhead conducting wire. The process includes adjusting components of alloy to a certain extent, and controlling an online deaeration purification system, rolling and an online solid-solution quenching system; performing wire drawing and ageing processing to ultimately obtain the single intermediate-strength aluminum alloy wire. The tensile strength of the single intermediate-strength aluminum alloy wire ranges from 260MPa to 300MPa, the elongation of the single intermediate-strength aluminum alloy wire is higher than or equal to 3.5%, and the single-wire conductivity of the single intermediate-strength aluminum alloy wire is higher than or equal to 57.5% IACS. The intermediate-strength aluminum alloy wire and the process have the advantages that the intermediate-strength aluminum alloy wire manufactured by the aid of the process is high in strength and elongation and good in conductivity, and an intermediate-strength aluminum alloy stranded wire which is formed after a plurality of intermediate-strength aluminum alloy wires are stranded with one another can be used for an overhead power transmission line and is high in tensile weight ratio, so that the running safety of the line can be improved; magnetic hysteresis loss and eddy current loss due to conventional steel-cored aluminum stranded wires can be prevented by the stranded wire which is completely formed after the intermediate-strength aluminum alloy wires are stranded with one another, and electric energy loss of the line can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of overhead wires for overhead transmission lines, and relates to a medium-strength aluminum alloy wire for overhead wires and a production process thereof. Background technique [0002] my country's overhead transmission lines are generally dominated by steel-cored aluminum stranded wires. As we all know, the steel core in ACSR not only increases the weight of the wire, but also has hysteresis loss and eddy current loss in the current transmission process, resulting in an increase in line construction investment and operating costs. In recent years, State Grid has vigorously advocated the construction of resource-saving and environment-friendly overhead transmission lines. In order to reduce the disadvantages of ACSR in overhead transmission lines, the State Grid Corporation of China advocates the alloying of wires for overhead transmission lines. For this reason, a series of alloy products such as medium ...

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Problems solved by technology

Among them, for medium-strength aluminum alloys, there are reports in relevant literature, such as Chinese patent documents CN102041418A, CN102162050A and CN103451498A, wherein CN102041418A produces aluminum alloy rods by continuous casting and rolling by adopting alloy composition ratios, and then artificially aging the aluminum alloy rods , and then wire drawing, and then artificial aging after wire drawing, the medium-strength aluminum alloy wire obtained by the process method has a tensile strength of 245-290 MPa, an elongation of 1.8-3.0%, and a single wire conductivity of not less than 57.0% IACS; CN102162050A adopts the continuous casting and rolling method to produce aluminum alloy rods through the proportioning of alloy components, then artificially ages the aluminum alloy rods, then draws them, and then artificially ages them to obtain medium-strength aluminum alloy wires. The tensile strength is 230-250MPa, the elongation is ≥2.0%, and the conductivity of the single wire is not less than 57.0% IACS; the elongation of the two medium-strength aluminum alloy wires is small, which makes the stranded wire overload resistance and fatigue resistance The performance is poor, resulting in poor safety. In addition, these two patents require artificial aging of the aluminum alloy rod and the drawn aluminum alloy wire twice, which not only increases the process and reduces the efficiency, but also consumes a lot of energy during the aging process, increasing the The manufacturing cost is reduced; CN103451498A adopts the continuous casting and rolling method to produce aluminum alloy rods through the proportioning of alloy components, and then draws the aluminum alloy rods, and then carries out artificial aging after drawing to obtain medium-strength aluminum alloy wires. Its tensile strength is ≥245MPa, elongation is ≥3.5%, and the single-wire conductivity is not less than 58.5% IACS; the conductivity of the medium-strength aluminum alloy wire has been improved to a certain extent, but its mechanical properties are low. , its safety is very important. When some transmission lines with large length, large span and high altitude need products with higher draw-to-weight ratio to meet the safety requirements of transmission lines

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