JPS6050153A - Production of aluminum alloy conductor having high strength and heat resistance - Google Patents

Abstract

PURPOSE:To obtain a titled conductor having the conductivity and strength equivalent to those of the conventional conductor and much higher heat resistance and flexibility by casting continuously or semi-continuously a molten Al alloy contg. Zr and Mg respectively at prescribed ratio then hot rolling the cast alloy to a roughly drawn wire immediately thereafter and subjecting the drawn wire to cold drawing after a heating treatment. CONSTITUTION:A molten Al alloy contg. 0.15-0.8wt% Zr and 0.05-0.5wt% Mg and consisting of the balance Al and ordinary impurities is cast continuously or semi-continuously at >=740 deg.C to solutionize thoroughly Zr. The resulted casting ingot is hot-rolled immediately to a roughly drawn wire without reheating and the drawn wire is subjected to a heating treatment for 1-100hr at 100- 500 deg.C to precipitate Zr and to provide improved heat resistance and recovered conductivity. The roughly drawn wire after the heating treatment is cold drawn and is finished to a conductor having a desired size and at the same time the strength is further improved by work hardening, by which the intended Al alloy conductor having high strength and heat resistance is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention (also relates to a method for manufacturing a high-strength heat-resistant aluminum alloy conductor, particularly a conventional high-strength side heat-resistant aluminum alloy) 9
The purpose is to produce a composite that has the same conductivity and strong moxibustion as the body, but has far superior heat resistance and flexibility.

Conventionally, aligned aluminum stranded wires using flexible conductors have been used for overhead power transmission lines, and due to special power transmission conditions,
For example, for power transmission lines that require heat resistance, heat-resistant aluminum alloy stranded wire with a single-core heat-resistant aluminum alloy made of a -7f alloy was used. 5005 series alloy (AJ2
-0.5 to 1.1wt% 1Vlfl>A steel-core high-casinoluminium X alloy stranded wire using a high-strength conductor was used.

In recent years, as the demand for power anchors has increased, from the standpoint of large-capacity power transmission, a combination of heat-resistant and high-strength anchors has become desirable, and so it has become possible to build anchors. However, in the case of a heat-resistant conductor made of 4I:Gaara△(-/1゛-based metal), regardless of the usage of the /r stone-containing metal, if the strength of the conductor is that high, it will be 4fl. It could not be used for power transmission lines, and it could not be used for all-aluminum alloy stranded wire.

Also, from 5005 series alloy.

The high strength conductor is 24K! The tensile strength of J/mm2 is reduced, and the thermal resistance is Δ(conductor consisting of 1αC) for electricity, and it is used for large-capacity power transmission lines that require heat resistance (incl. (“It was ugly.

Therefore, improvements in the strength of A, e-Zr series heat-resistant conductors and improvements in heat resistance of 5005 series high-strength conductors have been studied, and recently A, f! -L”e and 3 in Zr alloy
A high-strength heat-resistant aluminum alloy conductor has been developed that has improved strength without significantly impairing conductivity and heat resistance by adding 4° of i. These 8 pieces exhibited excellent properties such as electrical conductivity of about 56% 1ΔCS, tensile strength of about 25 KQ/mm2, and heat resistance of about 93% (heated at 230°C for 1 hour). It has the important disadvantage of poor flexibility, and further improvement in heat resistance is also desired.

In view of this, as a result of various studies, the present invention has almost the same conductivity and strength as conventional high-strength heat-resistant aluminum alloy conductors,
We have developed a method for manufacturing a high-strength, heat-resistant aluminum alloy conductor that has far superior heat resistance and conductivity.
r O, 15・~0.8wt% (hereinafter wt% is simply %
(abbreviated as), M(JO, 0!1 to 0.5%, and the remainder (abbreviated as 0.1% to 0.5%), and the remainder is obtained by continuous or semi-continuous casting of an aluminum alloy molten alloy consisting of normal impurities at a temperature of 740°C or higher. The ingot is immediately hot-rolled into rough wire without reheating, heat-treated at a temperature of 100-500°C for 1-100 hours, and then cold-drawn. It is.

That is, the present invention is capable of casting a molten alloy within the above composition range continuously or semi-continuously at a temperature of 740°C or higher.
Sufficiently dissolve Zr in solid solution. This is immediately hot-rolled to a rough wire without reheating, and then heated to 100-500°C.
Heat treatment for 100 hours at a temperature of J, SuZ
The heat resistance is improved by precipitating 7r, but the conductivity is also increased by I! Strength is improved by IJ recovery, 7-R precipitation hardening and MO 71-Rix strengthening. This is then subjected to cold C wire drawing to finish it into a conductor of desired dimensions, and the strength is further improved by work hardening. The conductor manufactured in this way has approximately the same electrical conductivity and strength as the conventional high-horn heat-resistant aluminum alloy conductor, and has a far superior heat resistance of 11.
Due to its flexibility, it can conduct more current as a conductor. Furthermore, this conductor has excellent flexibility and enables the use of all-aluminum alloy stranded wire as a conductor without the core loss found in ordinary copper-core aluminum stranded wire.

However, the reason why the alloy composition of J3 is limited as described above in the present invention is as follows.

It is Zr that limited the 7r-containing right river to 0.15-0.8%.
The purpose is to improve heat resistance by adding 0.8%, but if the content is less than 0.15%, the heat resistance will be insufficient no matter how the processing conditions and heat treatment conditions are selected.
This is because if the value exceeds 100%, the conductivity decreases more significantly than the effect of improving heat resistance, making it impossible to use it as a conductor. Also M
The g content is limited to 0.05 to 0.5%. This is to further improve strength and flexibility by adding Mg, but if the content is less than 0.05%, [
This is because the effect is small, and if it exceeds 0.5%, the conductivity decreases more significantly than the improvement in flexibility, making it impossible to use it as a conductor.

Other impurities include ordinary electrical grade A (impurities that are unavoidably included in the base metal will not impair the characteristics of the conductor.

Next, the casting temperature of the alloy within the above composition range was set to 74 (1"C
The reason for limiting the above is that continuous or semi-continuous casting allows Zr to be sufficiently dissolved in solid solution, and below 740°C, the amount of 7r solid solution is small, so the subsequent processing conditions and heat treatment conditions! 1
This is because no matter how you select /V, a heat resistance of 11'' cannot be obtained. J: The heat treatment conditions for the hot-rolled rough drawn wire were limited to 1-100 hours at a temperature of 100 to 500°C, because heat resistance 1t1= This is to improve the strength by precipitation hardening of Zr without restoring the electrical conductivity, and if the heated molten metal surface is below 100℃, sufficient precipitation effect will not be obtained, and at 500℃ This is because if the heating time exceeds the temperature, over-aging occurs and the strength decreases.Furthermore, if the heating time is less than 1 hour, there is little recovery of conductivity, and if the heating time exceeds 100 hours, the strength decreases prematurely. After the wire has been heat-treated to produce 71", cold wire drawing is performed to further increase the strength through work hardening and to finish the conductor to the desired dimensions.

Hereinafter, the present invention will be explained along the shoreline with reference to embodiments.

Using 99.6% pure electrical grade △ (base metal) and A (-5% 71゛ mother alloy or other Mu single metal), mix and melt the alloy with the composition shown in Table 1. A trapezoidal ingot with a cross-sectional area of 2000 nun'' was cast using a continuous casting machine, and this was immediately hot-rolled without reheating to form a rough drawn wire with a diameter of 9.5 mtn. After this rough drawn wire was heat treated, , cold wire drawing] - 4.0 mm in diameter was produced.

Regarding this combination, 'C conductivity, tensile strength, heat resistance and iI
The flexibility was measured and the results were compared with that of a 11"L high-strength heat-resistant aluminum 18 alloy conductor and are also listed in Table 1.

The electrical conductivity was determined by measuring the electrical resistance using a Gurgon double bridge, and the tensile strength was determined using the Amsler type test 1. The heat resistance was determined by heating the test sample I at a temperature of 230° C. for 1 hour and expressing the tensile strength after heating to the tensile strength of heating 1) a. In addition, the flexibility of the specimen is
It was held between the curved surfaces of A1"1 and repeatedly bent at 90° at the h-6 intersection H, and the number of times of 90' bending until breakage was measured.

``i'I ;% Fh No combination'k l1fl formation (
%) l+jufoiI17r Mq A soft (℃) Inventor 1 0,20 0.10 Remaining 76011
21IO0251I800 1I31I0.457! Il4 0. , +0 0,10 ,.

IT 5 JJ O, 2On ll0IJ0.401? '! 7 0.70 0,10.

Il 8 Horn 0.25 II II 9 IJ 0.45 Nol Comparative method 10 0.08 0.20 Horn l111 i,
20 η I/! ! 12 0.40 0.01.

Il13　n　O,70,.

Il 14 ll 0.20 Horn 7()Oノ! 15
nIru8QQ nl(iITIII) n l 7 7+ 77 J/ n 18n un n subordinate x<'c person 19 △i -0,7Fe -0,
I Si -0,12Zr,, 20 A, e-0,3
5Fe −0, I Si −0, 122′l= −0,
2CulI21 Δp −0,4Fe −0,I Si
-0,12Zr -0,15Cu+III heat treatment Electrical conductivity Tensile strength Heat resistance Flexibility/F11 temperature (°C) Time (
hr) (%■△C8) (K'; f/mm2) (%
) (times) 200 96 56.8 24.8 9[i
, 3 364B 55,9 25,7 95.4 40
350 24 5G, Il 2G, 4 97,0 43
400 57.0 25.8 97.6 35350
5G, 4 26.2 98.2 42450 57.2
24.8 97.0 4G500 2 56.6 2
5. Il 95,9 3812 57.4 24,6
95.2 40350 96 5G, 8 25.9 9
8.7 4224 57.4 24.878.4 3B
49.2 25.6 95, 1 42 55.8 23.8 9G, 2 16 49.6 25.4 9G, 9 11G5G, 2 24
,9 74.1 39 7OA8.625,4 95.8 40550 57.
3 18.1 04.9 37350 0.5 48.
225°1 95. G 41120 57.6 1f1
．． 49G, 1 3956.0 25,0 94.3 1
G 55.6 25.6 92.1 20 56.1 25.2 93.13 18 As is clear from Table 1, the fat bodies produced by the methods No. 1 to 9 of the present invention had a conductivity of 55.9. ~57.4% lAC31 tensile strength 24. G ~26.2) (g/m〃, 2, heat resistance 95
．． 2 to 98.7%, flexibility 35 to 46 times,
It can be seen that, compared with the conductors made by conventional method Nos. 19 to 21, the conductivity and tensile strength are almost the same, and the heat resistance and flexibility are far superior.

On the other hand, as can be seen from Comparative Method Nos. 10 to 13, those that fall outside the alloy composition range defined by the present invention have a low electrical conductivity.
Any one of tensile strength, heat resistance, and I'IJ flexibility is inferior. That is, comparative method No. 0.10 with low Zr content and J content has low heat resistance, comparative method No. 12 with low M(] content has poor flexibility, and comparative method No. 1 with high content of /1゛, It can be seen that the electrical conductivity is low for Comparative Methods No. 11 and No. 13, which have a high MCI content.

Furthermore, as can be seen from Comparative Method Nos. 14 to 18, even if the alloy composition is within the alloy composition range specified in the present invention, if the casting conditions or heat treatment conditions are not met, the electrical conductivity, tensile strength, and heat resistance are inferior. . That is, comparative method No. 14 with lower casting temperature
Comparative method N 0 with lower heat resistance and lower heat treatment temperature than t.
．． 15 and comparative method No. 1 with shorter processing time.

17 has low conductivity and heats up! 2! X-ri wet melon is 1a
Comparative method No. 16 and comparative method No. 16 with long processing time,
18 It can be seen that the T knee tJ tensile strength is low. 1. According to the present invention, the conductivity and strength are almost the same as those of conventional high-strength heat-resistant aluminum alloy conductors,
Furthermore, it is possible to obtain a conductor with far superior heat resistance and flexibility, and when used in steel core high strength heat resistant aluminum alloy stranded wires, it not only increases power transmission capacity but also reduces iron core loss. The use of all-aluminum aluminum stranded metal wires without any metal strands is extremely effective, and has a remarkable effect.

procedure? Paperback (spontaneous) 1. Indication of the case 1982 Patent Application No. 157538 2. Name of the invention Method for manufacturing high-strength heat-resistant aluminum alloy conductor 3. Person making the amendment Relationship to the case Patent applicant 4. Agent Address: 16-101, Kanda Kita Jomonocho, Chiyoda-ku, Tokyo
Contents 1 of the English Building Third Floor Amendment and the scope of claims are revised as shown in the attached sheet.

2. The following matters have been corrected in the detailed description of the invention.

(1) Page 4, line 1, page 4, line 8, and page 6, line 7 are corrected as [100-b "200-500°C."

(2) On page 6, line 12, replace “100℃” with “200℃”
℃” and corrected it.

Claims Z r O, 15~o, awt%, M (10,05~
A molten aluminum alloy containing 0.5 wt% and the remainder A (common impurities) is continuously or semi-continuously cast at a temperature of 740°C or higher, and the resulting ingot is immediately hot rolled without reheating. A method for manufacturing a high-strength, heat-resistant aluminum alloy conductor, which is characterized in that a rough drawn wire is heat treated at a temperature of 200 to 500° C. for 1 to 100 hours, and then cold wire drawn.

Claims (1)

[Claims] 7 l' 0.15-0.8 wt%, M (J O,0
Fluminiu 11 alloy melt lagoon containing 5 to 0.5 wt% and the balance A°C and condensed impurities is continuously or semi-continuously cast at a temperature of 740°C or higher, and the obtained ingot is reheated. Hot-rolled straight without any heat rolling, and then rolled it into a rough wire. 10
A method for producing a high-strength, heat-resistant aluminum alloy conductor, which is characterized in that it is heat-treated at a temperature of 0 to 500°C for a time of r1 to 10 forces, and then subjected to cold C wire drawing.