JPS59222550A - High strength aluminum alloy conductor and its manufacture - Google Patents

Abstract

PURPOSE:To obtain an Al alloy conductor having superior electric conductivity, elongation and workability by subjecting a rough Al alloy wire having a specified composition contg. Mg, Si, Fe, Cu, etc. to soln. heat treatment, hardening, artificial aging, cold drawing and tempering under specified conditions. CONSTITUTION:A rough Al alloy wire contg., by weight, 0.3-1.6% Mg, 0.3- 1.2% Si, 0.10-0.8% Fe, 0.005-0.6% Cu and 0.005-0.2% in total of one or more among Zr, Cr and Mn is subjected to soln. heat treatment at 450-600 deg.C, hardening and artificial aging at 140-250 deg.C for 0.5-20hr. The wire is then cold drawn at >=60% working rate and tempered at 100-200 deg.C for 0.5-20hr. By he composition and the heat treatment conditions, a high strenght Al alloy conductor with superior strength for twisting or other processing is obtd. The conductor is comparable to a conventional Al alloy conductor in electric conductivity, elongation, wire drawability and bendability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-strength aluminum alloy conductor and a method for manufacturing the same, and particularly to a conventional high-strength aluminum alloy conductor,
It has the same electrocardiac rate, elongation, wire drawability, and bending workability, and has far superior strength.

Conventionally, copper-core aluminum stranded wires using A conductors have been used for overhead power transmission lines, and when heat resistance is required, A, E conductors are used.
- Heat resistant A made of Zr alloy (if a cored heat resistant aluminum alloy stranded wire using an alloy conductor is used and further strength is required, Af-MQ-8i series high-temperature wire known as No. Force A (copper core madder horn aluminum base metal stranded wire using alloy conductor is used.

Recently, due to the difficulty in obtaining land for power plants, substations, and power transmission lines, and from the perspective of pollution control, the number of long-distance underground power transmission areas, such as valley TII stations in mountainous areas and IJ7i across the strait, has increased, and higher-strength zero bodies are required. It became so. However, if the number of additive elements is increased or the processing rate is increased for the purpose of improving the strength of the conductor, the electrical conductivity, elongation, and bending workability decrease (-).

In view of this, the present invention has been developed with regard to additive elements and alloy composition.
As a result of conducting experiments and research, it was found that compared to conventional aluminum alloy conductors, it has almost the same conductivity, elongation, wire drawability, and bending workability, and has far superior strength. We have developed a bright aluminum alloy conductor and its manufacturing method.

That is, the present invention leads to fvl fl O, 3 to 1. C1
wt% (hereinafter wt% is abbreviated as % a+, 4), 3 i
0.3-1.2%, Feo, 10-0.8%, Cu
O,005-0,6%, Zr, Cr.

Any one or two or more of lvl n in total 0.
0.005 to 0.2%, with the remainder consisting of A and normal impurities.

In addition, the IA manufacturing method of the present invention can be applied to aluminum j1 having the above composition range.
Alloy rough wire at 450-600℃! Solution treatment at fiti degree 1! +! After quenching, this is heated to an artificial temperature of 11η between 0.5 and P 20 Jiff at a temperature of 140 to 250°C.
After the heat treatment, the wire is cold drawn at a processing rate of 60% or more, and then tempered for 0.5 to 20 strokes at a temperature of 100 to 200'C.

The reason why the alloy composition is limited as described above in the present invention is as follows.

Mg and $1 are indispensable elements to avoid improving the strength. 'CI'
) If the content of any of them is below the lower limit, the effect will be small and the strength of the resulting conductor will be low.
This is because if the content of either of these exceeds the upper limit, the electrical conductivity decreases significantly despite the improvement in strength, and the elongation and bending workability also decrease.

Fe is an element for improving strength without reducing conductivity and elongation too much (1°C), and its content is 0.
If the content is less than 1%, there is little effect on strength, and if it exceeds 0.8%, no strength improvement effect is observed.
The electrical conductivity and elongation are lower than 11 (lower than 11%), which is due to the formation of bulky products during casting, resulting in poor wire drawability, bending workability, and fatigue resistance.

Cu is an element for improving strength like Fe,
Its content is less than 0.005%)1. This is because no such effect is observed with lj, and if the content exceeds 0.6%, elongation, bending workability, and corrosion resistance will decrease.

7r, ~in, and Cr are all elements for improving workability, and they elongate by preventing coarsening of recrystallized grains during solution treatment and improve bending workability. If the right hand's yakuza is less than 0.005%, the effect will be small, and 0.005%.
This is because the conductivity decreases significantly when it exceeds 2%.

The 27 bodies of the present invention have the above alloy composition, and are rough-drawn by the usual rolling method, extrusion (by hand or continuous casting and rolling method). Due to the solution treatment, the previous machining history will disappear.Hardening the rough wire after solution treatment at a temperature of 450 to 600'C solidifies Mq and Si. Therefore, at 450'C 4) i, 4, the amount of solid solution is not -1-minute 4) degrees/fi 1 (lower, 600'C 44 Elt 1211; L field becomes l1li'! , machining↑1 becomes worse.Cutting time for melting (1 gin period is not particularly limited, but usually 0.5 to 10 hours), like electric heating (~ λii II ; It is sufficient if h and sl are made into a solution by heating for 7 hours.

hF, enter (2740~250℃<7)
0. ! ] ・~201171#1 Artificial aging treatment (1) to improve strength and heat conduction rate, treatment temperature is 140°C)! Even if the time between Ij and 11'i is less than 0.5 hours, the strength and conductivity will not improve, but if the processing humidity exceeds 250°C, the strength will decrease due to excessive 11'1 effect.Also, if the processing temperature is below 180°C If so, there is no problem in terms of characteristics even if the process is carried out for more than 20 hours, but such a long process is uneconomical and the process is not carried out for more than 20 hours at a temperature of 180'C or higher. Otherwise, the strength will decrease due to excessive +11i effect.

After the artificial 111 effect treatment, 11iI line processing is performed on LJ at a processing rate of 1y O% in the cold in order to further improve the strength by work hardening.
``□, when 1) The epidemic is not relieved. Also, after wire drawing processing, 100%
The tempering treatment at a temperature of ~200°C (0.5~20 hours is used to improve bending workability and electrical conductivity (T,
Even if the treatment is less than 100T or less than 0.5 hours, the elongation and bending workability are not improved, and the electrical conductivity is low. On the other hand, 20
When the temperature exceeds 0℃, the over-aging C strength is low 1. When the humidity is below 160℃, the C strength is 2 On: '1.
There is no problem in terms of characteristics even if the time is exceeded, but it is uneconomical and 16
If the treatment is carried out for more than 20 hours at a temperature exceeding 0'C, the performance will be reduced due to over-helping.

According to the present invention, the expansion rate, elongation, bendability, and workability of the conventional No.
], and it is possible to obtain an intensity biased toward 1).

Therefore, the conductivity, strength, elongation, and bendability of the conductor are confused. and ML, J content is 0.7 to 1.0%,
The Si content is 0.6-0.9%, the Fe content is 0.2%.
~0.4%, CLI-containing right cliff 0.05-0.2%, 7r
It is desirable that the combined content of one or more of , Or, and Mn be 0.02-0.05%. Also, even if the manufacturing conditions are J5, the solution treatment temperature is 500~
540'C1 artificial poetry treatment is performed at a temperature of 160~220℃ for 4~8 hours, the wire drawing rate is over 80%, and the tempering treatment [j
It is desirable that the temperature be between 120 and 160°C, and between 4 and 8111°C.

In addition, in the present invention, 6. 11 or Ti, which is usually added as a grain atomizing agent during Ij,
-B compound is included, but there is no difference in the special 1 (1-H).

) The present invention will now be described in detail with reference to Examples.

A for electricity with a purity of 99.75% (melting the base metal and adding M to it)
g alone, Af! , -25% 5ift alloy, A criminal - 0%
Fe master alloy, Af-50% Cu master alloy, potassium fluoride zirconium (Kz Zr Fs), Af-10% CI = master alloy, Al 40% Mn master alloy were added to obtain the composition shown in Table 1. The alloy was melted, rolled and rolled into a rough wire with a diameter of 9.5 g. A body with a diameter of 3.5 mm was manufactured by solution water quenching, artificial 1: 1: J treatment, wire drawing and tempering under the conditions shown in Table 1.

This conductor was tested for electrical conductivity, tensile strength, elongation, and bending workability. Also, in the production of the conductor 1 and the dew T,
The number of paper breaks per 10 t OIj during wire drawing was determined. These results are shown in Table 3.

The bending property was determined by bending the sample by 180° fJ” 5i1
: We conducted an experiment to determine the number of times the test results were broken [1] or 1.

No. 11 - Alloy composition 62 Alloy composition
(%) -J h4gS! Fe
C1l Zl' Cr M1'1 △(
Invention alloy △ 0. G5 0,5G O,2
50,5! i 0.02 - - 11 remaining
130.75 0. G2 0.38 0.23
0.03-=! ! lIC; 0,90 0,7
1.0,29 0,15 0.05 - -
! l)'l) 1,120,830.270,09
0.09n no I [2 1.521.260,120,05
0. +5--u! IF O,940,8+1 0
,74 0.19 - 0.03 - n
l・G '1,03 0,90 0.20
0j8 0.15-IIIll-10°8
6 0,73 0,63 0.2! l −0
,02n1Il O,850,C70,310,0
80,i[3rrII,J O,(io
0.41 0. :I! + 0.2 0.0
1 0. (11-l1llK O,750,54
0,150,05-0,020,O4nll1-0
．． 92 0.80 0.250.10 0.02
0.01 0.01 ll fvl
1.1. '1 0.8G O,1
00,0+ 0.02 0.02 0,
02 Horn comparison alloy N O,200,2
50,7! i 0.42 0.02 −
-nn O1,701,300,540,
450,03--n” P O,830,6
? 0.92 0.08 0.02-1! tl
IQ +, 10 0.82 0.08 0,
35 0.02 rln
j Ma 0,7(i 0.Gl O,270
,8! i --0,07nll5O,800,85
0,200,1l---rノ'TO,9
10,8G O,230,130,3l--niI
(ノ 0.95 0.91
0,17 0.0'j -0,35tl
ll \/ 0,94 0.90.0.3
1 0. +5- - 0,37 ni, η coming alloy W O, 4! + 0.60 0.2
0 - - - - n11 ward raccoon j
＝に；、－訃よ；、≧〜-(6゛4ゝ"lI-J(J,
lko mini; M 1 can - [= korai' residence! ! : Cloud ○ Z "He01's ■T's ■♀;♀Shiny Publishing 4 Hi, g+p+CDC'''CI')<sai+J)0'-!
:3E>p3"' Official ■ Tsukuda-2 (N 汱工""" co O') 0 sun Mi ≧ Mi tet 1 oka m; Hokumiyaku Hop <fO box 2 tsu'l JI OQ-OC1 (1) S
:) > 37? ? Sea: g: (Shichito; Ro8 Sa8; Snigo38 Seven-SaS g Table 3 (1> Manufacturing method NO conductivity Tensile strength Elongation Number of wire breaks Bending (%I'AC8> (Kg/ mm
2) (%) Times 7'lOn (times) Method of the present invention 1 54.5 42.7
4.5 0 10〃2 53.5
40,5 5.1 0 12#
3 54.1 41.2 4,
0 0 12I14 54. G
41.5 4,5 0 1On
5 53.8 44.7 4.0
0 4In 653.7 4
3. G 4.1 0 12n
7 53, 7 45.1 4.5
0 13〃8 54.0 41.
6 4.7 0 12/7 9
53.2 42.2 5.0 0
11〃10 53.0 41.3
4.6 0 1On 11
53.2 42,3 4,3 0
10,, 12 54, 1 42
．． 4 4.1 0 10" 13
53.2 43,13 4.3
0 10 comparison method 14 56,2
28.3 6.5 0 1
0u 15 49.6 34.5
2.5 0 1On 16 5
5.8 2G, 3 4.8 0
101!17 54,6 34,5
5.8 0 10〃18 54,9
3G, 1 4.6 0 10〃
19 54.0 31.2 5.2
0 10〃20 57.2 2
5,3 5.0 0 101121
49.1 42.0 3,8 5
6II 22 50.1 4
1,0 1.8 10 '17 2
3 53.1 38.8 4.0
0 101!24 48,5 4
1.2 2.0 5 7n 25
53.3 42.1 2. +
30 2〃26 50.6 43
．． 5 2.3 0 13 Table 3 (2) Manufacturing method No. Q Electricity Tensile Relaxation Elongation Breakage Number of bends (%IAC8) (K!l/mn
? ) (%) Times 40+1 Sex (times) n 2
7 50.2 42.6 3.5
0 12rJ 28 50.8
41,4 3.5 0 12 Conventional method 29 53,0 32,5
4.5 0 10 Tables 1 to 3 J,
As is clear, all of the conductors manufactured by methods No. 1 to 13 of the present invention have a conductivity of 53% lAC3 or more, a tensile strength of 40, 5 Kgy〃m2 or more, and an elongation of 4.0%.
It exhibits higher properties and has good wire drawability and bending workability, compared to the conventional/J method NO, 29 conductor.
It can be seen that the strength is much higher (6).

On the other hand, comparative method No. 14, which has a lower solution temperature,
Comparative method No. with high surface effect temperature, IG, Comparative method No. with high tempering temperature, 17, Comparative method No. with long processing time,
18. Comparison method with low wire drawing processing rate after artificial aging No. 1
In No. 9, the strength is 1-(< Comparison method No. with a low tempering temperature compared to artificially aged stone, and in No. 15, the conductivity, strength of 11, and elongation are low.

Comparative method N in which the alloy composition is outside the composition range of the present invention
It can be seen that conductivity, strength, elongation, wire drawability, and bending workability are inferior by 01 at O.20 to 28. That is, M
Comparative method No. with less g and 81 content.

20, Comparative method No. 23r with low Fe content, both have low strength, Comparative method No. 23r with high 4g and 3i content φ
, 21, "Comparison method with high e content No. 22, CU
Comparative method N 0924, which contains a large amount of nitric acid, has lower electrical conductivity and elongation (I (lower), and elongation and bending (workability and bending (J) is inferior. Also, 7r, Cr,
Comparative method NO, 25 which does not contain 1vln has elongation, wire drawing]l property and bending property, which is extremely poor in workability/r, O
r, Mn included [11 or more comparison methods No, 2G・
〜2 B ``All C's have similar conductivities [Z is the most picturesque.

As described above, according to the present invention, it has almost the same electrical conductivity, wire warping, wire drawability, and bending properties as the conventional No. I aluminum alloy, and exhibits far superior strength. )9
Body is obtained, copper core cylinder aluminum alloy 7'! ! 4 W
It can be used for aluminum or all-aluminum alloy stranded wires, etc., to produce a wide range of effects.

Claims (2)

[Claims] (1) MuO, 3-1.6wt%, 3i0.3
~1.2wt%, FeO, 10~0.8wt%, C
u O,005 to 0.6 wt% and any one or two or more of 7r, Cr, and Mn in total of 0.005 to 0.2
Contains wt%, the rest consists of normal impurities (ca-aminium alloy conductor). (2) to/+(10.3~1.6Wt%, 3
i0.3~1.2wt%, FeO,10~
0.8wt%, Cu O,005~0.6wt%, l
Contains 0.005 to 0.2 f [%] of any one or more of r, Or, and Mn, and the remainder (and 450 to 60
After solution treatment at a temperature of 0°C, it is quenched and heated to 140~2
After artificial aging treatment at a temperature of 50℃ for 0.5-20 hours,
Cold wire drawing with a processing rate of 60% or more, then 100~
A method for producing a high-strength aluminum alloy conductor, which comprises tempering at a temperature of 200°C for a period of 0.5 to 2011 yen.