JPS634621B2 - - Google Patents

Description

[Detailed description of the invention]

(Technical Field) The present invention relates to a conductive heat-resistant aluminum alloy wire having excellent heat resistance and conductivity. (Background technology) In recent years, heat-resistant steel core aluminum alloy stranded wires (hereinafter referred to as TACSR
) is used. A heat-resistant aluminum alloy with 60% conductivity (hereinafter referred to as 60TAl) has been adopted as 60TACSR in Japan's main power transmission lines. Conventionally, this 60TAl is made from electrical aluminum ingot specified by JISH2110 with a small amount of Zr added to increase its heat resistance, but in order to emphasize heat resistance, a large amount of Zr is added. As the amount of Zr increases, the electrical conductivity decreases, and in order to satisfy the balance of properties, strength, and heat resistance, strict control of manufacturing conditions is required. (Disclosure of the Invention) The present invention has been made to solve the above-mentioned problems, and has a wide range of composition components that satisfy the required characteristics such as conductivity, strength, and heat resistance, and is easy to manage in manufacturing. The present invention aims to provide a heat-resistant aluminum alloy wire for conductive use that is inexpensive to manufacture. The present invention has Zr0.015~0.066%, Fe0.07%~0.33
%, B0.002% or less, Be 0.005~0.1%, and has the relationship of Fe amount/5+Zr amount = 0.04~0.08%, and the balance is Al and normal impurities, making it conductive. This heat-resistant aluminum alloy wire for conductive use is characterized by having an IACS ratio of 60% or more, a strength equivalent to that of hard aluminum wire, and a residual tensile strength of 90% or more after heating at 230°C for 1 hour. Here, the residual tensile strength means the percentage (%) of the tensile strength of a wire heated at 230° C. for 1 hour and then cooled to the tensile strength before heating. The conductive heat-resistant aluminum alloy wire of the present invention is used as a heat-resistant conductor for heat-resistant ACSR, heat-resistant aluminum alloy busbars, commutator bars, etc., and its cross-sectional shape may be round, rectangular, tape, pipe, or other irregular shapes. Either is fine. In the present invention, Zr is solid-dissolved in the aluminum alloy to improve heat resistance, and the amount of Zr is 0.015 to 0.015.
The reason why it is specified as 0.066% is that if it is less than 0.015%, the heat resistance will not be sufficient, and if it exceeds 0.066%, the following formula (1) will not be satisfied. In addition, Fe is a solid solution part in aluminum alloy and Al ₃ Fe,
The finely precipitated parts as Al ₆ Fe improve strength and heat resistance, and the reason why we specified the Fe amount at 0.07 to 0.33% is that if it is less than 0.07%, there will be no effect.
This is because if it exceeds 0.33%, the following equation (1) will not be satisfied. Further, in the present invention, the contents of Zr and Fe are defined as shown in the following formula. Amount of Fe/5+Amount of Zr=0.04 to 0.08...(1) The figure shows the relationship between the Zr amount and the Fe amount, and the shaded area indicates the range that satisfies equation (1). The reason for specifying as in formula (1) is to maintain the balance between heat resistance and electrical conductivity of aluminum alloy, and 0.04%
If it is less than 0.08%, the heat resistance will not be sufficient, and if it exceeds 0.08%, the electrical conductivity will not be satisfactory. In addition, in the present invention, B forms a compound with Zr,
Since B loses its contribution to heat resistance, it is important to control it particularly strictly in terms of heat resistance performance.
It is necessary to suppress it to 0.002% or less, preferably 0.001% or less. If it exceeds 0.002%, heat resistance will deteriorate. In addition, in the present invention, Be represents the electrical conductivity of the aluminum alloy;
This is to improve heat resistance, and the amount of Be is 0.005 to 0.1.
% because if it is less than 0.005%, there will be no effect, and if it exceeds 0.1%, the effect will be saturated and the cost will increase. The aluminum alloy wire of the present invention can be manufactured by melting the aluminum alloy and then using the same method as for ordinary conductive aluminum alloy wires. For example, for casting, continuous casting, chill mold casting, hot or cold rolling, extrusion, swaging, wire drawing for area reduction processing, batch type or continuous type for heat treatment can be applied. (Example) An aluminum alloy having the composition shown in Table 1 was melted, cast using a belt-and-wheel continuous casting machine with a mold cross-sectional area of 3200 mm ² , and then hot rolled at a temperature of 530 to 560°C. , I created a 9.5mm rough line. This roughly drawn wire was subjected to wire drawing to create 3.8 aluminum alloy wire. The performance of the obtained lines is shown in Table 1. Heat resistance was expressed as residual tensile strength after heating at 230°C for 1 hour.

【table】

[Table] From Table 1, No. 1 to No. 7 according to the present invention have electrical conductivity
It can be seen that it satisfies 90% IACS or higher, tensile strength equivalent to hard aluminum wire (16.17Kg/mm2 ^or higher), and heat resistance of 90% or higher. On the other hand, the comparative example does not satisfy any one of the characteristics. (Effects of the Invention) The conductive heat-resistant aluminum alloy wire of the present invention configured as described above has the following effects. (a) Zr0.015~0.066%, Fe0.07%~0.33%,
Contains B0.002% or less and Be0.005-0.1%,
The relationship is as follows: Fe amount/5 + Zr amount = 0.04~0.08%, and since the aluminum alloy is composed of the balance Al and normal impurities, the synergistic effect of Zr, Fe, B, and Be improves the conductivity and strength of aluminum. Improves heat resistance without deteriorating, so conductivity is 60% IACS or higher,
It satisfies the performance of having strength equivalent to hard aluminum wire and residual tensile strength of 90% or more after heating at 230°C for 1 hour. (b) As mentioned above, a low amount with a relatively wide range of ingredients.
Performance is satisfied with Zr and a wide range of Fe. (c) The manufacturing method can be a normal method and does not require any special treatment or conditions, so the manufacturing conditions are easy to manage and the manufacturing cost is low.

[Brief explanation of the drawing]

The figure is a diagram showing the relationship between the amount of Zr and the amount of Fe in the present invention.

Claims (1)

[Claims] 1 Zr0.015-0.066%, Fe0.07-0.33%, B0.002
% or less and contains Be0.005-0.1%, and
It is made of an aluminum alloy with a relationship of Fe content / 5 + Zr content = 0.04 to 0.08%, the balance being Al and normal impurities, electrical conductivity of 60% IACS or more, strength equivalent to hard aluminum wire, and 1 at 230 ° C. A heat-resistant aluminum alloy wire for conductive use that has a residual tensile strength of 90% or more after heating for a period of time. 2. The conductive heat-resistant aluminum alloy wire according to claim 1, wherein the aluminum alloy contains 0.001% or less of B.