JPS59157252A - Heat-resistant aluminum alloy wire for electric conduction - Google Patents

Abstract

PURPOSE:To obtain a heat-resistant Al alloy wire for electric conduction with superior heat resistance and electric conductivity by adding specified percentages of Zr, Fe, B and Be to Al so as to specify the electric conductivity, strength and residual tensile strength. CONSTITUTION:An Al alloy wire consisting of 0.015-0.066% Zr, 0.07-0.33% Fe, <=0.002% B, 0.005-0.1% Be and the balance Al with ordinary impurities and satisfying Fe%/5+Zr%=0.04-0.08% is manufactured. By the synergistic effect of Zr, Fe, B and Be, the heat resnstance of Al is improved without reducing the electric conductivity and strength, so >=60% IACS electric conductivity, strength equal to that of a head Al wire, and >=90% residual tensile strength after heating at 230 deg.C for 1hr are satisfied.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a conductive side heating aluminum alloy wire having excellent heat resistance and conductivity.

(Background technology) In recent years, for example, in order to increase power transmission capacity and improve the reliability of power systems by operating a single circuit during decimal times when operating two circuits, stranded steel-core aluminum alloy stranded wires (hereinafter referred to as TAC5R) have been used. has been done. For this purpose, 60% electrical conductivity heat distribution aluminum alloy (hereinafter referred to as 60TAβ) is used in Japan's main power transmission lines.
It has been adopted as C3R.

To this 60TAβ, a small amount of Zr is added to electrical aluminum base metal specified in conventional JISH21 0 to improve heat resistance. There is a tendency to increase the amount, and this Zr
The more you increase the amount, the more the conductivity will decrease, and the characteristics...
Strict control of manufacturing conditions was necessary to satisfy the requirements for lance, strength, and heat resistance.

(Disclosure of the Invention) The present invention has been made to solve the above-mentioned problems, and has a wide composition range that satisfies required properties such as conductivity, strength, and heat resistance, and is easy to manage in manufacturing. The purpose of the present invention is to provide a heat-resistant aluminum alloy wire for conductive use that is inexpensive to manufacture.

The present invention contains Zr0.015-0.066%, FeO,
07-0.33%, Bo, 002% or less and BeO
,005 to 0.1%, and Koshi Zr amount -〇,0
It is made of an aluminum alloy with a relationship of 4 to 0.08%, the balance being AR and normal impurities, and has a conductivity of 60% lAC.
3 or more, strength equivalent to hard aluminum wire, and 230
This heat-resistant aluminum alloy wire for conductive use is characterized by having a residual tensile strength of 90% or more after heating at °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 can be used for example (, tlli
It is used as a heat-resistant conductor such as a heat-resistant aluminum alloy busbar, a commutator bar, etc., and its shape may be round, rectangular, tape, pipe, or other irregular shapes.

In the present invention, Zr is solid-solved in the aluminum alloy to improve surface J thermal properties, and the amount of Zr is set at 0.015 to 0.0.
The reason why it is specified as 66% 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 p, 13Fe
, the finely precipitated portion as Aβ6 Fe improves strength and heat resistance, and the amount of Fe is 0.07 to 0.03
The reason why it is specified to be 3% is that if it is less than 0.07%, there is no effect, and if it exceeds 0.33%, the following formula (1) is not satisfied.

Further, in the present invention, the Zr and FeO contents are defined as shown in the following formula.

Engineering + Zr i = 0.04~0.08% ---
= (1) The figure shows the relationship between the Zr content and the Fe content, and the shaded area indicates the range that satisfies the equation (1). -(+
) is specified in order to maintain the balance between thermal properties and electrical conductivity of aluminum alloys.If it is less than 0.04%, the thermal properties are insufficient, and if it exceeds 0.08%, the electrical conductivity is satisfactory. It is a sword that disappears.

In addition, in the present invention, since B forms a compound with Zr and loses its contribution to heat resistance, it is important to control B particularly strictly from the viewpoint of heat resistance. It is necessary to keep it below %. 0.002
%, heat resistance deteriorates.

In addition, in the present invention, Be is used to improve the electrical conductivity and heat resistance of the aluminum alloy, and the amount of Be is set to 0.005 to OI%.
The reason why this is specified is that 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, threading, 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, and the cross-sectional area of the mold was 32 mm.
It was cast using a 00 ynyM belt-and-wheel type continuous casting machine, followed by hot rolling at a temperature of 530 to 560°C to produce a rough wire of 9.5 mm.

□ This roughly drawn wire was subjected to wire drawing to create a 3.8 mm f aluminum alloy wire.

The performance of the obtained lines is shown in Table 1.

Surface J Thermal strength is expressed as the residual tensile strength after heating at 230°C for 1 hour.

Table 1 From Table 1, it can be seen that flats 1 to 7 according to the present invention have a conductivity of 90%.
lAC3 or higher, tensile strength, equivalent to hard aluminum wire (1
6,17Kg/+++ performance) and heat resistance of 90% or more.

On the other hand, the comparative example does not satisfy any one of the characteristics.

(Effects of the Invention) The conductive surface J thermal aluminum alloy wire of the present invention configured as described above has the following effects.

(a) Zr 0.015-0.06696, FeO,
07-0.33%, BOOO296 or less and BeO
,005 to 0.1%, and average + Zr amount -0.0
Zr, Fe,
The synergistic effect of B and Be improves the conductivity of aluminum.
Improves thermal properties without reducing strength, resulting in electrical conductivity of 60% rAcs or higher, strength equivalent to hard aluminum wire, and residual tensile strength after heating at 230°C for 1 hour.
Satisfies performance of 0% or more.

Naka) As mentioned above, low L'4 Zr has a relatively wide range of components.
.

Performance is satisfied with a wide range of Fe components.

(c) Manufacturing method: A normal method is sufficient 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 shows the relationship between Zr content and Fe in the present invention.
(%) Continued from page 1 0 Inventor: Takashi Kondo, 10-2 Yogonoe, Shinminato City, Toyama Electric Cable Factory, Sumitomo Electric Industries, Ltd.

Claims (2)

[Claims] (1) ZrO, 015-0.066%, Fe
O, 07-0.33%, Bo, OO'2% or less and B
It is made of an aluminum alloy containing eO,005~0.1%, efi and ■+Zr1=0.04~0.08%, and the balance is Aβ and normal impurities, and has an electrical conductivity of 60%. A heat-resistant aluminum alloy wire for conductive use, characterized by having an AC of 3 or more, a strength equivalent to that of a hard aluminum wire, and a residual tensile strength of 90% or more after heating at 230°C for 1 hour. (2) The conductive heat-resistant aluminum alloy wire according to claim 1, which contains aluminum alloy or Bo, 0.001% or less.