JP4809934B2 - Dilute copper alloy wire, plated wire and stranded wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dilute copper alloy wire rod having high productivity and excellent conductivity, softening temperature and surface quality. <P>SOLUTION: The dilute copper alloy wire is obtained by carrying out cold wire-drawing of the wire rod manufactured by a continuous casting and rolling process using copper alloy material comprising 2-12 mass ppm of sulfur, 2-30 mass ppm of oxygen, 4-55 mass ppm of titanium, and a balance consisting of copper as a base material, wherein the conductivity of the wire rod when cold-drawn by 90% working ratio is 98% IACS (International Annealed Copper Standard) and semi-softening temperature is 130-148&deg;C. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a dilute copper alloy wire, a plated wire, and a stranded wire having high productivity and excellent electrical conductivity, softening temperature, and surface quality.

  In recent industrial products such as electronic devices and automobiles, copper wires are often used severely. In order to address these needs, a dilute copper alloy material that can be manufactured by a continuous casting and rolling method, etc., and has higher conductivity than pure copper while maintaining conductivity and elongation properties at pure copper level has been developed. .

  As a dilute copper alloy material, as a general-purpose soft copper wire and a soft copper material that requires softness, a soft conductor having an electrical conductivity of 98% or more and further 102% or more has been demanded. Are: wiring materials for consumer solar cells, conductors for enameled wires for motors, soft copper materials for high temperatures used at 200 ° C to 700 ° C, molten solder plating materials that do not require annealing, copper materials with excellent thermal conductivity, high-purity copper It can be used as an alternative material and meets these broad needs.

  The material used as a dilute copper alloy material is based on a technology that controls oxygen in copper to 10 mass ppm or less, and a small amount of metal such as Ti is added to the copper atom of this base to form a solid solution in an atomic form. By doing so, it is expected that a dilute copper alloy material having high productivity and excellent conductivity, softening temperature and surface quality can be obtained.

  Conventionally, as for softening, as shown in Non-Patent Document 1, softening occurs more quickly in a sample in which 4 to 28 mol ppm of Ti is added to electrolytic copper (99.996 mass% or more) than in a case where Ti is not added. The result is obtained. The literature concludes that this is due to a decrease in the solute S due to Ti sulfide formation.

  In Patent Documents 1 to 3, it is proposed and continuously patented in a continuous casting apparatus to use a dilute alloy obtained by adding a trace amount of Ti to oxygen-free copper.

  Here, methods for lowering oxygen by a continuous casting and rolling method are also known as shown in Patent Documents 4 and 5.

  In patent document 6, when manufacturing a copper material directly from a molten copper by a continuous casting and rolling method, metals such as Ti, Zr, and V are contained in a minute amount (0.0007 to 0.005 mass) in a molten copper having an oxygen content of 0.005 mass% or less. %) It has been proposed to lower the softening temperature by addition. However, in Patent Document 6, the study on the electrical conductivity has not been made, and the manufacturing condition range in which the electrical conductivity and the softening temperature are compatible is unknown.

  On the other hand, Patent Document 7 proposes a method for producing an oxygen-free copper material having a low softening temperature and a high electrical conductivity, and in an upward pulling continuous casting apparatus, oxygen-free copper having an oxygen content of 0.0001 mass% or less, There has been proposed a method for producing a copper material from a molten copper to which a minute amount (0.0007 to 0.005 mass%) of a metal such as Ti, Zr, or V is added.

  However, as described above, none of patent documents discusses a material containing a small amount of oxygen, such as a base material of a diluted copper alloy material, that is, a material containing an oxygen concentration in the order of ppm.

Japanese Patent No. 3050554 Japanese Patent No. 2737954 Japanese Patent No. 2737965 Japanese Patent No. 3555433 Japanese Patent No. 3651386 JP 2006-274384 A JP 2008-255417 A

SUZUKI, Hisashi Minohiro: Iron and Steel (1984) No.15, 1977-1983

  Therefore, it has been desired to study a practical dilute copper alloy wire having high productivity, excellent conductivity, softening temperature, and surface quality and its composition.

  Further, when considering the production method, as described above, a method of adding Ti to oxygen-free copper by continuous casting and making it soft is known, but this is a hot extrusion after producing a cast material as a cake or billet. And wire rolling by hot rolling. For this reason, the manufacturing cost is high, and there is a problem in economical efficiency for industrial use.

  Moreover, although the method of adding Ti to oxygen-free copper with an upward pulling continuous casting apparatus is known, this also has a problem in terms of economy because the production rate is slow.

  Therefore, an attempt was made with the SCR continuous casting and rolling system (Southwire Continuous Rod System).

  In the SCR continuous casting and rolling method, a base material is melted into a molten metal in a melting furnace of an SCR continuous casting and rolling apparatus, and a desired metal is added to the molten metal to be melted. A rod: φ8 mm, for example, is produced, and the rough drawing wire is processed to φ2.6 mm, for example, by cold drawing. Moreover, it can process similarly to the size below φ2.6mm, a board | plate material, and a deformed material. It is also effective to roll a round wire rod into a square shape or an irregular shape. It is also possible to produce a deformed material by extruding a wire rod.

  As a result of investigations by the present inventors, when using SCR continuous casting and rolling, surface scratches are likely to occur in tough pitch copper as a base material, and the softening temperature variation and the formation state of titanium oxide are unstable depending on the addition conditions. I understood it.

  When oxygen-free copper having an oxygen content of 0.0001% by mass or less was examined, the conditions satisfying the softening temperature, conductivity, and surface quality were in a very narrow range. Further, there is a limit to the decrease in softening temperature, and a lower softening temperature comparable to that of high-purity copper is desired.

  Accordingly, an object of the present invention is to provide a diluted copper alloy wire that solves the above-described problems, has high productivity, and is excellent in conductivity, softening temperature, and surface quality.

The invention of claim 1 in order to achieve the above object, and 2～12Mass ppm sulfur, and oxygen 2～30Mass ppm, seen including a Ti of 4～55Mass ppm, in dilute copper alloy wire balance being copper The diluted copper alloy wire is characterized in that its electrical conductivity is 98% IACS or higher and its semi-softening temperature is 130 to 148 ° C.

  The invention of claim 2 is the diluted copper alloy wire according to claim 1, wherein the concentration of Ti is 37 mass ppm or less and the conductivity is 100% IACS or more.

  The invention of claim 3 is the diluted copper alloy wire according to claim 1, wherein the concentration of Ti is 25 mass ppm or less, and the conductivity is 102% IACS or more.

  The invention of claim 4 is a plated wire characterized in that a plating layer is formed on the surface of the diluted copper alloy wire according to any one of claims 1 to 3.

  The invention of claim 5 is a stranded wire comprising a plurality of the diluted copper alloy wires or the plated wires according to any one of claims 1 to 4 twisted together.

  According to the present invention, it is possible to provide a practical dilute copper alloy wire having high productivity and excellent conductivity, softening temperature, and surface quality.

It is a figure which shows the SEM image of a TiS particle | grain. It is a figure which shows the analysis result of FIG. Is a view showing an SEM image of the TiO ₂ particles. It is a figure which shows the analysis result of FIG. In this invention, it is a figure which shows the SEM image of Ti-O-S particle | grains. It is a figure which shows the analysis result of FIG.

  Hereinafter, a preferred embodiment of the present invention will be described in detail.

First, the present invention is obtained by cold working at a workability of 90% (for example, φ8 mm → φ2.6 mm), using a SCR continuous casting and rolling facility, having few surface scratches, a wide manufacturing range, and capable of stable production. The wire has a semi-softening temperature of 148 ° C. or lower and an electrical conductivity of 98% IACS (conductivity with an International Anneld Copper Standard resistivity of 1.7241 × 10 ⁻⁸ Ωm as 100%), preferably It is to obtain a diluted copper alloy wire as a soft copper material satisfying 102% IACS or more.

At this time, for high purity Cu (6N, purity 99.9999%), the semi- softening temperature at a cold work degree of 90% is 130 ° C. Therefore, it is possible to stably produce soft copper having a soft material conductivity of 98% IACS or more, preferably 100% IACS or more, more preferably 102% IACS or more at a semi-softening temperature of 130 ° C. or more and 148 ° C. or less. It is an object of the present invention to obtain a raw material as a dilute copper alloy material and its manufacturing conditions.

  Here, a φ8 mm wire rod manufactured from a molten metal added with several mass ppm of titanium using a small continuous casting machine (small continuous casting machine) using Cu (4N) having an oxygen concentration of 1 to 2 mass ppm. When the softening temperature is measured by processing this to φ 2.6 mm (working degree 90%), it is 160 to 168 ° C., and the softening temperature is not further lowered. The conductivity is about 101.7% IACS. Therefore, it was found that even when Ti was added at a low oxygen concentration, the softening temperature could not be lowered, and the conductivity was worse than 102.8% IACS of high purity Cu (6N).

  The cause of this is presumed that the softening temperature does not decrease because sulfur is contained in several mass ppm or more as an inevitable impurity during the production of molten metal, and sulfides such as TiS are not sufficiently formed between this sulfur and titanium. .

  Therefore, in the present invention, in order to lower the softening temperature and improve the electrical conductivity, the two measures have been studied and the two effects have been combined to achieve the goal.

(A) Increase the oxygen concentration of the material to 2 mass ppm or more and add titanium. Thereby, it is considered that TiS and titanium oxide (TiO ₂ ) and Ti—O—S particles are first formed in the molten copper (the SEM images of FIGS. 1 and 3 and the analysis results of FIGS. 2 and 4). reference). In FIGS. 2, 4, and 6, Pt and Pd are vapor deposition elements for observation.

(B) Next, by setting the hot rolling temperature lower (880 to 550 ° C.) than the normal copper production conditions (950 to 600 ° C.), dislocations are introduced into the copper and S is likely to precipitate. Like that. As a result, precipitation of S on the dislocations or precipitation of S using titanium oxide (TiO ₂ ) as a nucleus forms Ti—O—S particles and the like as an example of molten copper (SEM image of FIG. 5 and FIG. 6 shows the analysis result).

  According to (a) and (b), crystallization of sulfur in copper and precipitation of sulfur during hot rolling are performed, and a copper wire rod that satisfies the softening temperature and electrical conductivity after cold wire drawing can be obtained.

  Next, in this invention, (1)-(4) was restrict | limited as a restriction | limiting of the manufacturing conditions in SCR continuous casting rolling equipment.

(1) Restriction of composition When obtaining a soft copper material having an electrical conductivity of 98% IACS or higher, pure copper (base material) containing inevitable impurities is 3-12 mass ppm of sulfur, 2-30 mass ppm of oxygen, and Ti. A wire rod (rough drawing wire) is manufactured with a diluted copper alloy material containing 4 to 55 mass ppm.

  Here, when obtaining a soft copper material having an electrical conductivity of 100% IACS or more, a diluted copper containing 2 to 12 mass ppm of sulfur, 2 to 30 mass ppm of oxygen, and 4 to 37 mass ppm of pure copper containing inevitable impurities. The wire rod is preferably made of a copper alloy material.

  Furthermore, when obtaining a soft copper material having an electrical conductivity of 102% IACS or more, a diluted copper alloy containing 3-12 mass ppm of sulfur, 2-30 mass ppm of oxygen, and 4-25 mass ppm of Ti in pure copper containing inevitable impurities. It is good to use a wire rod with a material.

  Usually, in the industrial production of pure copper, sulfur is taken into copper when producing electrolytic copper, so it is difficult to make sulfur 3 mass ppm or less. The upper limit of the sulfur concentration of general-purpose electrolytic copper is 12 mass ppm.

  As described above, if the amount of oxygen to be controlled is small, the softening temperature is difficult to decrease. Further, if there is too much oxygen, surface scratches are likely to occur in the hot rolling process, so it is set to 30 mass ppm or less.

(2) Restriction of dispersed substances It is desirable that the size of dispersed particles is small and distributed in large numbers. The reason is that the size is small and the number is large because it functions as a sulfur deposition site.

Sulfur and titanium form compounds or aggregates in the form of TiO, TiO ₂ , TiS, and Ti—O—S, and the remaining Ti and S are present in the form of a solid solution. A dilute copper alloy material in which the size of TiO is 200 nm or less, TiO ₂ is 1000 nm or less, TiS is 200 nm or less, and Ti—O—S is 300 nm or less is distributed in the crystal grains.

  However, since the size of the formed particles changes depending on the holding time of the molten copper during casting and the cooling condition, it is necessary to set casting conditions.

(3) Restriction of casting conditions Wire rods are made by SCR continuous casting and rolling. As an example, a method of manufacturing a wire rod of φ8 mm with a processing degree of 99.3% is used.

  (A) The casting temperature in the melting furnace is 1100 ° C. or higher and 1320 ° C. or lower. When the temperature of the molten copper is high, blowholes increase, scratches are generated, and the particle size tends to increase. The reason why the temperature is set to 1100 ° C. or higher is that copper is hardened and the production is not stable, but the casting temperature is preferably as low as possible.

  (B) As for the hot rolling temperature, the temperature at the first rolling roll is 880 ° C. or lower, and the temperature at the final rolling roll is 550 ° C. or higher.

  Unlike normal pure copper production conditions, crystallization of sulfur in molten copper and precipitation of sulfur during hot rolling are the subject of the present invention, so in order to reduce the solid solubility limit that is the driving force. The casting temperature and the hot rolling temperature are preferably (a) and (b).

  The normal hot rolling temperature is such that the temperature at the first rolling roll is 950 ° C. or lower and the temperature at the final rolling roll is 600 ° C. or higher. In order to reduce the solid solution limit, Is set to 880 ° C. or lower and the temperature at the final rolling roll is set to 550 ° C. or higher.

  The reason why the temperature is set to 550 ° C. or higher is that the wire rod has many scratches below this temperature, so that the product is not manufactured. The hot rolling temperature is preferably as low as possible, with the temperature at the first rolling roll being 880 ° C. or lower and the temperature at the final rolling roll being 550 ° C. or higher. By doing so, the softening temperature of the copper material obtained by cold-working the wire rod (for example, after processing to φ8 to φ2.6) becomes as close as possible to high-purity Cu (6N, softening temperature 130 ° C.).

  (C) The conductivity of a wire rod having a diameter of φ8 mm is 98% IACS or more, preferably 100% IACS or more, more preferably 102% IACS or more, and the semi-softening temperature of φ2.6 mm wire after cold drawing A dilute copper alloy wire having a temperature of 130 ° C to 148 ° C can be obtained.

In order to use it industrially, it is necessary to use 98% IACS or more in the industrially used soft copper wire produced from electrolytic copper, and the softening temperature is 148 ° C. or less in view of its industrial value. When Ti is not added, the temperature is 160 to 165 ° C.
Since the softening temperature of high-purity Cu (6N) was 127 to 130 ° C, the limit value is set to 130 ° C from the obtained data. This slight difference is in unavoidable impurities not found in high purity Cu (6N).

  The conductivity is about 101.7% IACS at the level of oxygen-free copper, and 102.8% IACS for high-purity Cu (6N), so that the conductivity is as close to high-purity Cu (6N) as possible. Is desirable.

(4) Restriction of casting conditions Copper was controlled to be in a reduced state after melting in the shaft furnace, that is, in the reducing gas (CO) atmosphere, the sulfur concentration, Ti concentration, oxygen of the constituent elements of the diluted alloy A method of stably producing a wire rod to be cast and rolled while controlling the concentration is preferable. Since the copper oxide is mixed and the particle size is large, the quality is lowered.

  Here, the reason for selecting Ti as an additive is as follows.

  (A) Ti is easily bonded to sulfur in molten copper to form a compound.

  (B) It can be processed and handled more easily than other additive metals such as Zr.

  (C) It is less expensive than Nb or the like.

  (D) It is because it is easy to precipitate using an oxide as a nucleus.

From the above, the diluted copper alloy material of the present invention can be used as a molten solder plating material (wire, plate, foil), enameled wire, soft pure copper, high conductivity copper, soft copper wire, high productivity, conductivity, A practical dilute copper alloy material having excellent softening temperature and surface quality can be obtained.
Further, a plating layer may be formed on the surface of the diluted copper alloy wire of the present invention. As the plating layer, for example, a layer mainly composed of tin, nickel, and silver is applicable, and so-called Pb-free plating may be used.
Moreover, it is also possible to use it as a diluted copper alloy stranded wire obtained by twisting a plurality of diluted copper alloy wires of the present invention.
Moreover, it can also be used as the cable which provided the insulating layer around the diluted copper alloy wire or diluted copper alloy twisted wire of this invention.
Further, a plurality of diluted copper alloy wires of the present invention are twisted to form a central conductor, an insulator coating is formed on the outer periphery of the central conductor, and an outer conductor made of copper or copper alloy is disposed on the outer periphery of the insulator coating, It can also be used as a coaxial cable having a jacket layer on the outer periphery.
Further, a plurality of coaxial cables can be arranged in the shield layer and used as a composite cable in which a sheath is provided on the outer periphery of the shield layer.

  Moreover, in the above-mentioned embodiment, although the wire rod was produced by SCR continuous casting rolling and the example which produced a soft material by hot rolling was demonstrated, this invention is a twin roll type continuous casting rolling and a Properti type continuous. You may make it manufacture by a casting rolling method.

  Table 1 relates to experimental conditions and results.

  First, as an experimental material, φ8 mm copper wires (wire rod: degree of processing 99.3%) were prepared for each of the oxygen concentration, sulfur concentration, and Ti concentration shown in Table 1, and the experimental material was cold-drawn. Then, the semi-softening temperature and conductivity at a size of φ2.6 mm were measured, and the dispersed particle size in a φ8 mm copper wire was evaluated.

  The oxygen concentration was measured with an oxygen analyzer (Leco ™ oxygen analyzer). Each concentration of sulfur and Ti is the result of analysis with an ICP emission spectroscopic analyzer.

  The measurement of the semi-softening temperature in the size of φ2.6 mm was obtained from the result of quenching in water after holding each temperature at 400 ° C. or less for 1 hour and conducting a tensile test. It calculated | required using the result of the tensile test at room temperature, and the result of the tensile test of the soft copper wire which performed the oil bath heat processing for 1 hour at 400 degreeC. The temperature corresponding to the strength showing half of the difference in tensile strength was defined as the semi-softening temperature.

  It is desirable that the dispersed particles have a small size and are distributed a lot. The reason is that the size is small and the number is large because it functions as a sulfur deposition site. That is, the case where the number of dispersed particles having a diameter of 500 μm or less was 90% or more was determined to be acceptable (◯).

  In Table 1, the comparative material 1 is a result of making a trial production of a copper wire having a diameter of 8 mm in an Ar atmosphere in a laboratory, and Ti is added with 0 to 18 mass ppm.

  With this Ti addition, 13 mass ppm decreases to 160 ° C. and becomes minimum with a semi-softening temperature of 215 ° C. with no Ti addition, and increases with addition of 15 and 18 mass ppm, and the desired softening temperature is 148 ° C. or less. Did not become. However, although the industrially required conductivity was 98% IACS or more, it was satisfactory, but the overall evaluation was x.

  Then, the oxygen concentration was adjusted to 7 to 8 mass ppm by the SCR continuous casting and rolling method, and a φ8 mm copper wire (wire rod) was prototyped.

  The comparative material 2 is a material with a low Ti concentration (0.2 mass ppm) produced by trial using the SCR continuous casting and rolling method, and the electrical conductivity is 102% IACS or more, but the semi-softening temperature is 164, 157 ° C. Since the required temperature of 148 ° C. or lower was not satisfied, the overall evaluation was x.

  About execution material 1, oxygen concentration and sulfur are almost constant (7-8 mass ppm, 5 mass ppm), and it is a result of a trial material from which Ti concentration differs (4-55 mass ppm).

  In this Ti concentration range of 4 to 55 mass ppm, the softening temperature is 148 ° C. or lower, the conductivity is 98% IACS or higher, 102% IACS or higher, and the dispersed particle size is 500% or less, which is 90% or higher. is there. And the surface of the wire rod is also clean, and all are satisfied as product performance (overall evaluation ○).

  Here, what satisfies the conductivity of 100% IACS or more is when the Ti concentration is 4 to 37 mass ppm, and that which satisfies 102% IACS or more is when the Ti concentration is 4 to 25 mass ppm. When the Ti concentration was 13 mass ppm, the maximum conductivity was 102.4% IACS, and the conductivity was slightly lower around this concentration. This is because when Ti was 13 mass ppm, the sulfur content in copper was captured as a compound, thereby showing conductivity close to that of high-purity Cu (6N).

  Therefore, both the semi-softening temperature and the conductivity can be satisfied by increasing the oxygen concentration and adding Ti.

  Comparative material 3 is a prototype material having a Ti concentration as high as 60 mass ppm. In this comparative material 3, the electrical conductivity satisfies the request, but the semi-softening temperature is 148 ° C. or higher, and the product performance is not satisfied. Furthermore, there were many surface damages on the wire rod, making it difficult to produce a product. Therefore, the addition amount of Ti is preferably less than 60 mass ppm.

  Next, Example Material 2 is a prototype material in which the sulfur concentration is set to 5 mass ppm, the Ti concentration is set to 13 to 10 mass ppm, and the oxygen concentration is changed to examine the influence of the oxygen concentration.

  Regarding the oxygen concentration, a prototype material having greatly different concentrations from 2 or less to 30 mass ppm was used. However, when oxygen is less than 2 mass ppm, production is difficult and stable production cannot be performed, so the overall evaluation is Δ. It was also found that even when the oxygen concentration was increased to 30 mass ppm, both the semi-softening temperature and the conductivity were satisfied.

  Moreover, as shown in the comparative material 4, when oxygen was 40 mass ppm, there were many scratches on the surface of the wire rod, and the product was not a product.

  Therefore, by setting the oxygen concentration in the range of 2 to 30 mass ppm, the characteristics of the semi-softening temperature, the conductivity of 102% IACS or more, and the dispersed particle size can be satisfied, and the surface of the wire rod is clean, Both can satisfy product performance.

  Next, the embodiment material 3 is an example of a prototype material in which the oxygen concentration and the Ti concentration are relatively close to each other and the sulfur concentration is changed to 4 to 20 mass ppm. In this material 3, the prototype material with less sulfur than 2 mass ppm could not be realized from the raw material side, but by satisfying both the semi-softening temperature and the conductivity by controlling the concentrations of Ti and sulfur. Can do.

  When the sulfur concentration of the comparative material 5 was 18 mass ppm and the Ti concentration was 13 mass ppm, the semi-softening temperature was high at 162 ° C. and the required characteristics could not be satisfied. Moreover, since the surface quality of the wire rod was particularly poor, it was difficult to commercialize the product.

  From the above, when the sulfur concentration is 2 to 12 mass ppm, the properties of semi-softening temperature, conductivity of 102% IACS or more, and dispersed particle size are satisfied, and the surface of the wire rod is clean and all product performance is achieved. I was satisfied.

  Moreover, although the examination result using high purity Cu (6N) was shown as the comparative material 6, it is a semi-softening temperature 127-130 degreeC, and electrical conductivity is 102.8% IACS, and dispersion particle size is also 500 micrometers or less. No particles were observed.

  Table 2 shows the molten copper temperature and rolling temperature as the production conditions.

  Comparative material 7 shows the result of trial manufacture of a wire rod of φ8 mm at a molten metal temperature of 1330 to 1350 ° C. and a rolling temperature of 950 to 600 ° C.

  Although this comparative material 7 satisfies the semi-softening temperature and the electrical conductivity, the dispersed particles have a size of about 1000 μm, and the particle size of 500 μm or more exceeds 10%. Therefore, this was inappropriate.

  The execution material 4 shows the result of trial manufacture of a φ8 mm wire rod at a molten copper temperature of 1200 to 1320 ° C. and a lower rolling temperature of 880 to 550 ° C. About this implementation material 4, the wire surface quality and the dispersed particle size were also good, and the overall evaluation was good.

  Comparative material 8 shows the result of trial production of a wire rod of φ8 mm at a molten copper temperature of 1100 ° C. and a lower rolling temperature of 880 to 550 ° C. Since this comparative material 8 had a low molten copper temperature, the wire rod had many surface scratches and was not suitable for the product. This is because scratches are likely to occur during rolling because the molten copper temperature is low.

  Comparative material 9 shows the result of trial manufacture of a wire rod of φ8 mm at a molten metal temperature of 1300 ° C. and a higher rolling temperature of 950 to 600 ° C. Since this comparative material 9 had a high hot rolling temperature, the surface quality of the wire rod was good, but some of the dispersed particles were large, and the overall evaluation was x.

  Comparative material 10 shows the result of trial manufacture of a φ8 mm wire rod at a molten copper temperature of 1350 ° C. and a lower rolling temperature of 880 to 550 ° C. Since this comparative material 10 had a high molten copper temperature, some of the dispersed particles had a large size, and the overall evaluation was x.

Claims (5)

And 2～12Mass ppm sulfur, and oxygen 2～30Mass ppm, seen including a Ti of 4～55Mass ppm, the balance being a dilute copper alloy wire is copper, and the conductivity thereof is 98% IACS or more, A diluted copper alloy wire having a semi-softening temperature of 130 to 148 ° C.   2. The diluted copper alloy wire according to claim 1, wherein the Ti concentration is 37 mass ppm or less and the conductivity is 100% IACS or more.   The dilute copper alloy wire according to claim 1, wherein the Ti concentration is 25 mass ppm or less, and the conductivity is 102% IACS or more.   A plated wire, wherein a plated layer is formed on the surface of the diluted copper alloy wire according to claim 1.   A stranded wire obtained by twisting a plurality of the diluted copper alloy wires or plated wires according to claim 1.