JP2008311151A - Aluminum covered steel wire and overhead wire using it, overhead ground wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum covered steel wire having a high corrosion resistant performance and a mechanical strength suitable for electric wire usage and superior in economical efficiency while using an aluminum metal having a purity equivalent to regular overhead transmission line aluminum, and an overhead wire and an overhead ground wire using the same. <P>SOLUTION: Since an aluminum covered part 11 containing at least one of manganese (Mn) of 0.1-2.9 wt.% and magnesium (Mg) of 0.4-5.6 wt.% in aluminum of purity of 99.7 wt.% or more and not exceeding 99.9 wt.% is provided as a covered material on the outer circumference of a steel wire 10, the aluminum covered steel wire uses aluminum with superior corrosion resistance, thereby, it has a mechanical strength suitable for electric wire usage and furthermore, an excellent economical efficiency can be given. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an aluminum-clad steel wire, an overhead electric wire using the aluminum-clad steel wire, and an overhead ground wire, in particular, while using an aluminum ingot having a purity equivalent to that of normal aluminum for overhead power transmission lines, high corrosion resistance and electric wire use. The present invention relates to an aluminum-clad steel wire having mechanical strength suitable for the above and excellent in economic efficiency, an overhead electric wire using the same, and an overhead ground wire.

  Conventionally, as an overhead electric wire, a steel core aluminum strand (ACSR) in which a plurality of aluminum conductor wires are twisted on the outer periphery of a galvanized steel strand is widely used. When such an electric wire is laid in a coastal area, an industrial area, or the like, corrosion may occur due to sea salt particles or smoke gas existing in the surrounding environment.

  In recent years, it has also been pointed out that in areas other than these areas, as represented by acid rain, corrosion proceeds due to moisture containing fouling substances. When an electric wire corrodes, the mechanical performance and electrical performance are lowered, and it is difficult to stably supply power. Furthermore, if corrosion progresses, the electric wire may be broken and transmission may become impossible.

  The same phenomenon is caused by optical ground wire (OPGW) formed by twisting a plurality of aluminum-covered steel wires that are coated with pure electrical aluminum around an aluminum pipe that contains optical fibers. Is also accepted. When corrosion of an optical fiber composite ground wire progresses, problems such as optical fiber communication failure may occur due to penetration of the aluminum pipe and significant deformation of the aluminum pipe due to corrosion products.

  Conventionally, anti-corrosion grease has been applied to suppress such corrosion of overhead electric wires. This method fills and applies grease-like anticorrosives between the strands of the overhead wire and on the outer surface. Corrosive substances such as sea salt particles and smoke gas are applied to the aluminum wire and steel wire that make up the wire. It prevents contact and suppresses the development of corrosion.

  Moreover, the overhead electric wire which uses high purity aluminum as a coating | covering material is proposed as what improves the corrosion resistance of an overhead electric wire (for example, refer patent document 1).

  According to the overhead electric wire described in Patent Document 1, it is formed by coating high purity aluminum having a purity of 99.9% or more, which is excellent in corrosion resistance against a substance that causes corrosion, on a steel wire that is an anticorrosion object. . Thereby, the overhead electric wire excellent in corrosion resistance is obtained.

  Furthermore, an overhead electric wire in which other elements are added to aluminum having a purity of 99.9% by weight or more has been proposed as a coating with corrosion resistance and mechanical strength (see, for example, Patent Document 2).

According to the overhead electric wire described in Patent Document 2, as a supplement to the mechanical strength of aluminum having a purity of 99.9% by weight or more, zirconium, An aluminum alloy to which any one or more of manganese and magnesium is added is used as an aluminum conductor wire of a steel core aluminum stranded wire or a coating material for a steel wire. Thus, an overhead electric wire excellent in corrosion resistance and mechanical strength can be obtained by replacing or covering the anticorrosion object with a high corrosion resistance and high strength material.
JP 2005-11570 A JP 2006-222021 A

However, the method of filling and applying the anticorrosion grease to the overhead electric wire has the following problems. That is,
(1) Electric wires installed outdoors are exposed to rain and wind, and the grease agent on the surface of the electric wires may peel off or flow down. In this case, the wire anticorrosion effect of the grease is not only reduced, but may lead to contamination of the surrounding environment due to the grease agent that has flowed down.
(2) In addition, there are cases where the grease agent itself deteriorates due to the influence of aging (ultraviolet rays) irradiation over time, and the anticorrosion effect is lowered.
(3) Furthermore, it has been pointed out that the workability at the time of laying construction of the electric wire filled and coated with the grease agent is slightly inferior to that of the normal electric wire not using the grease agent.

  Moreover, according to the overhead electric wires described in Patent Documents 1 and 2, although the corrosion resistance is improved because high purity aluminum having a purity of 99.9% by weight or more is used, the process required for refining aluminum and the manufacturing cost thereof are large. Therefore, there is a problem that it leads to a significant cost increase of the entire overhead electric wire.

  Accordingly, an object of the present invention is to provide an aluminum base metal having high corrosion resistance and mechanical strength suitable for electric wire use and excellent in economic efficiency while using an aluminum ingot having a purity equivalent to that of ordinary aluminum for overhead power transmission lines. An object of the present invention is to provide a steel covered wire, an overhead electric wire using the steel covered wire, and an overhead ground wire.

  In order to achieve the above object, the present invention is provided so as to cover the outer periphery of a steel wire, and at least one of manganese and magnesium is converted to aluminum having a purity of 99.7% by weight or more and not exceeding 99.9% by weight. Provided is an aluminum-clad steel wire characterized by having an aluminum coating part added thereto.

  In order to achieve the above object, the present invention provides an overhead electric wire comprising the above-described aluminum-clad steel wire and a plurality of aluminum conductor wires arranged circumferentially on the outer circumference of the aluminum-clad steel wire. provide.

  In order to achieve the above object, the present invention provides an optical fiber unit having a plurality of optical fiber strands, an aluminum pipe that accommodates the optical fiber unit, and a circumferential arrangement on the outer periphery of the aluminum pipe. An aerial ground wire characterized by having an aluminum covered steel wire.

  ADVANTAGE OF THE INVENTION According to this invention, while using the aluminum ingot which has the purity equivalent to normal aluminum for overhead power transmission lines, it has high corrosion resistance and mechanical strength suitable for electric wire use, and provides excellent economic efficiency. be able to.

[First Embodiment]
FIG. 1 is a cross-sectional view of an aluminum alloy-coated steel wire according to the first embodiment of the present invention.
In the following description, the aluminum alloy-coated steel wire is simply referred to as “aluminum-covered steel wire”.

  The aluminum covered steel wire 1 includes a steel wire 10 made of a round wire, and an aluminum covered portion 11 made of an alloy in which other elements are added to aluminum not exceeding a purity of 99.9% by weight provided on the outer periphery of the steel wire 10; Have

  The aluminum covering part 11 covering the outer periphery of the steel wire 10 is made of 0.1 to 2.9% by weight manganese (Mn) and 0.4 to 5.6% by weight in aluminum not exceeding 99.9% by weight. It contains at least one of magnesium (Mg).

  In order to increase the corrosion resistance of aluminum, it is effective to increase its purity. It is known that the corrosion resistance of aluminum changes corresponding to its purity, and the corrosion resistance improves as the purity increases. The purity of an aluminum conductor wire used for ordinary ACSR is about 99.7% by weight, but Ito, “Light Metal” 1981, Vol. 10, according to p683-696, when the purity of aluminum is increased from 99.7% by weight to 99.8% by weight, the number of pitting corrosion is reduced to about ½, and when the purity becomes 99.99% by weight, It has been reported that the number of pitting corrosion is significantly reduced.

  However, the high purity of the aluminum material leads to an increase in cost by requiring a process such as repeated refining. From this, the purity of the aluminum material according to the present invention is higher than the purity (about 99.7% by weight) of an ordinary aluminum conductor wire for an overhead power transmission line, and the purity does not exceed 99.9% by weight in terms of cost. Is preferred.

Manganese (Mn) added to aluminum is an element contributing to the improvement of corrosion resistance. Inevitable impurities of aluminum include iron (Fe), silicon (Si), etc., and these often exist as intervening particles such as FeAl ₃ , Fe ₂ SiAl ₆ , FeSi. Among these intermetallic compounds, FeAl _{3 and the} like have a noble potential with respect to the aluminum ground (matrix), and therefore, their surroundings are likely to be a starting point of corrosion. Al—Mn-based intermetallic compounds are formed by the addition of Mn. This intermetallic compound easily reacts with inevitable elements such as Fe, and Al—Mn—Fe-based intermetallic compounds are formed. Since the potential of this compound is close to that of aluminum, the amount of FeAl _{3 and the} like formed is relatively reduced as compared with the case of no addition of Mn, leading to improvement in corrosion resistance.

  When the amount of Mn added is less than 0.1% by weight, the amount of Al-Mn intermetallic compound formed is small, and sufficient corrosion resistance cannot be obtained. Further, if the amount of Mn added exceeds 2.9% by weight, the processing becomes difficult, and fine defects may be easily generated on the surface during processing. Accordingly, the amount of Mn added is preferably in the range of 0.1 to 2.9% by weight.

  Magnesium (Mg) added to aluminum is an element that promotes the effect of improving pitting corrosion resistance and local corrosion resistance and the growth of an oxide film. An ultrathin oxide film (passive film, protective layer, barrier layer) is formed on the surface of the aluminum, and this oxide film protects the underlying aluminum. The growth of the oxide film due to the addition of Mg contributes to the improvement of corrosion resistance.

  If the amount of Mg added is less than 0.4% by weight, the effect of promoting the growth of the oxide film is small and sufficient corrosion resistance cannot be obtained. Further, if the amount of Mg added exceeds 5.6% by weight, processing may become difficult. Therefore, the amount of Mg is preferably in the range of 0.4 to 5.6% by weight.

  The aluminum-clad steel wire 1 is effective for suppressing the exposure of the steel wire due to corrosion when the coating thickness of the aluminum coating portion 11 is increased, and the strength of the aluminum-clad steel wire 1 is increased when the coating thickness is reduced. From this, the coating thickness can be arbitrarily set according to the application.

  About the coating method of the aluminum coating | coated part 11 to the steel wire 10, it can carry out by applying well-known methods, such as an extrusion method, a longitudinal addition tape welding method, a plating method, a powder metal sintering method, or a thermal spraying method, for example. it can.

[Effect of the first embodiment]
According to the first embodiment described above, the outer periphery of the steel wire 10 has a purity of 99.7% by weight or more and aluminum not exceeding 99.9% by weight as a covering material. Mn) and aluminum covering portion 11 containing at least one of 0.4 to 5.6 wt% magnesium (Mg) is provided, so an aluminum ingot having a purity equivalent to that of ordinary overhead transmission line aluminum is used. However, it has high corrosion resistance and mechanical strength suitable for electric wire applications, and can provide excellent economic efficiency.

[Second Embodiment]
FIG. 2 is a cross-sectional view of an overhead electric wire according to the second embodiment of the present invention.

  The overhead electric wire 2 includes the aluminum-covered steel wire 1 described in the first embodiment, six aluminum-covered steel wires 1 twisted in the circumferential direction on the outer periphery of one aluminum-covered steel wire 1, and 7 12 aluminum conductor wires 12 twisted in the circumferential direction on the outer periphery of the two aluminum-clad steel wires 1, and 18 aluminum conductor wires 12 twisted further in the circumferential direction on the outer periphery of the 12 aluminum conductor wires 12. Have Seven aluminum-clad steel wires 1 function as tension members.

  The aluminum conductor wire 12 is made of pure electrical aluminum having a purity of about 99.7% by weight.

[Effect of the second embodiment]
According to the second embodiment described above, the purity of the aluminum covered steel wire 1 constituting the tension member on the outer periphery of the steel wire 10 is 0.1 to 99.7% by weight and not more than 99.9% by weight. Since the aluminum covering portion 11 including at least one of 2.9% by weight of manganese (Mn) and 0.4 to 5.6% by weight of magnesium (Mg) is provided, it is preferable as described in the first embodiment. In addition to the effect, it is possible to prevent the steel wire 10 from being exposed by improving the corrosion resistance of the tension member.

  When the steel ground of the aluminum covering part 11 is exposed due to corrosion and comes into contact with the adjacent aluminum conductor wire 12, not only does the corrosion promoting action (dissimilar metal contact corrosion, electrolytic corrosion) occur based on the potential difference between the steel and aluminum, Although there is a problem that the corrosion of the surroundings is promoted by the corrosion products, in the second embodiment, the dissimilar metal contact corrosion (electric corrosion) of the aluminum conductor wire due to the exposure of the steel ground of the aluminum-covered steel wire is extremely high. Since it does not act easily and the amount of corrosion products generated is very small, corrosion of the entire overhead wire 2 is suppressed, and the mechanical strength and electrical performance of the overhead wire 2 are maintained over a long period of time.

  In addition, by improving the corrosion resistance and ensuring the mechanical strength and electrical performance of the electric wires, it is possible to supply stable power and extend the period of use, thereby reducing the operating cost of power transmission equipment. it can.

[Third Embodiment]
FIG. 3 is a cross-sectional view showing an optical fiber composite ground wire according to the third embodiment of the present invention. In the following description, the optical fiber composite aerial ground wire is simply referred to as “aerial ground wire”.

  As shown in FIG. 3, this aerial ground wire 3 has an aluminum pipe 13 made of aluminum having a purity of about 99.7% by weight and an optical fiber for information communication, and is accommodated in the aluminum pipe 13. It has a unit 14 and six formed aluminum covered steel wires 15 provided on the outer periphery of the aluminum pipe 13.

  The aluminum pipe 13 is made of pure electrical aluminum having a purity of about 99.7% by weight.

  The formed aluminum-covered steel wire 15 is made of a steel wire 10 having a fan-shaped cross-section, aluminum having a purity of 99.7% by weight or more provided in the circumferential direction on the outer periphery of the steel wire 10 and other than aluminum having a purity of 99.9% by weight. It has the aluminum coating | coated part 11 which consists of an alloy which added the element, and is shape | molded by the fan-shaped cross section. The formed aluminum-covered steel wire 15 is provided so as to be arranged in the circumferential direction of the aluminum pipe 13 to form a circular cross section.

  The aluminum-coated portion 11 of the formed aluminum-covered steel wire 15 is made of 0.19 to 2.9% by weight of manganese (Mn) and 0.1% to 2.9% by weight of aluminum that has a purity of 99.7% by weight or more and does not exceed 99.9% by weight. It contains at least one of 4 to 5.6% by weight of magnesium (Mg).

[Effect of the third embodiment]
According to the third embodiment described above, the purity of the formed aluminum-covered steel wire 15 provided on the outer periphery of the aluminum pipe 13 that accommodates the optical fiber unit 14 is 99.7 wt. Aluminum coating comprising at least one of 0.1 to 2.9% by weight manganese (Mn) and 0.4 to 5.6% by weight magnesium (Mg) on aluminum not less than 99.9% by weight Since the portion 11 is provided, exposure of the steel ground of the formed aluminum covered steel wire 15 due to corrosion can be suppressed as much as possible, and excellent corrosion resistance is obtained.

  When an overhead ground wire is installed in a corrosive atmosphere such as a coastal zone, the aluminum covered portion of the aluminum covered steel wire is corroded and lost, and other aluminum covered steel wires and aluminum pipes are corroded around the exposed steel ground. May be promoted and deformation of the pipe may occur. As the corrosion further progresses, the aluminum pipe may be penetrated or a large deformation may occur due to the corrosion product, which may cause an optical fiber communication failure, but in the third embodiment, in the molded aluminum By obtaining a structure in which corrosion of the aluminum pipe 13 is hardly caused by improving the corrosion resistance of the steel covering wire 15, the mechanical strength is maintained over a long period of time, and the reliability without causing communication failure of the optical fiber unit 14 is excellent. An imaginary ground wire 3 is obtained.

  Examples of the present invention will be described below. First, the Example of the aluminum covered steel wire 1 is demonstrated.

  As Example 1, 0.21 wt% of iron (Fe), 0.08 wt% of silicon (Si), 0.002 wt% of copper (Cu), 0.002 wt% of titanium (Ti), vanadium (V) 0 0.002% by weight and the balance of aluminum (Al) made of aluminum (Al) with a purity of about 99.7% by weight, the manganese (Mn) addition amount was set within the range of 0.1 to 2.9% by weight, respectively. Cast materials (1-1, 1-2, and 1-3) were produced, and a rough drawn wire made of an aluminum alloy with a diameter of 9.5 mm was obtained through a hot rolling process for the cast material. Next, the steel wire was coated with an aluminum alloy using these rough drawn wires by a hot extrusion method. Then, the obtained composite wire was cold-drawn with a single-head wire drawing machine under conditions of 1-pass reduction 25 ± 5% and a drawing speed of 20 m / min, and the strand diameter was 2.6 mm and the aluminum alloy coating thickness was A 0.17 mm aluminum-clad steel wire 1 was obtained.

  As Example 2, an aluminum ingot having the same composition as that of Example 1 and having a purity of about 99.7% by weight, the magnesium (Mg) addition amount is within the range of 0.4 to 5.6% by weight, and the parameters Cast materials (2-1, 2-2, and 2-3) were manufactured, and hot rolling, coating on steel wire by hot extrusion, and cold drawing were performed under the same conditions as in Example 1. Thus, an aluminum-clad steel wire 1 having the same wire diameter and the same aluminum alloy coating thickness as in Example 1 was obtained.

  As Example 3, about 99.7% by weight of aluminum ingot having the same composition as Example 1, manganese (Mn) addition amount is 0.1-2.9% by weight, magnesium (Mg) addition amount is Cast materials (3-1 and 3-2) within the range of 0.4 to 5.6% by weight were produced, and the steel wire was subjected to hot rolling and hot extrusion under the same conditions as in Example 1. Coating and cold drawing were carried out to obtain an aluminum-clad steel wire 1 having the same wire diameter and the same aluminum alloy coating thickness as in Example 1.

  As Example 4, iron (Fe) 0.14 wt%, silicon (Si) 0.05 wt%, copper (Cu) 0.001 wt%, titanium (Ti) 0.001 wt%, vanadium (V) 0 0.001% by weight and the balance of aluminum (Al) consisting of aluminum (Al) with a purity of about 99.8% by weight, the manganese (Mn) addition amount was set within the range of 0.1 to 2.9% by weight, respectively. Cast materials (4-1, 4-2, and 4-3) were produced, and a rough drawn wire made of an aluminum alloy having a diameter of 9.5 mm was obtained through a hot rolling process. Next, the steel wire was coated with an aluminum alloy using these rough drawn wires by a hot extrusion method. And the obtained composite wire was cold-drawn with a single-head wire drawing machine under the same conditions as in Examples 1 to 3 (1 pass reduction 25 ± 5%, wire drawing speed 20 m / min), and the wire diameter An aluminum-clad steel wire 1 having a diameter of 2.6 mm and an aluminum alloy coating thickness of 0.17 mm was obtained.

  As Example 5, an aluminum ingot having the same composition as that of Example 4 and having a purity of about 99.8% by weight, the magnesium (Mg) addition amount was within the range of 0.4 to 5.6% by weight, and Cast materials (5-1, 5-2, and 5-3) were prepared, and hot rolling, coating on steel wire by hot extrusion, and cold drawing were performed under the same conditions as in Example 4. Thus, an aluminum-clad steel wire 1 having the same wire diameter and the same aluminum alloy coating thickness as in Example 4 was obtained.

  As Example 6, about 99.8% by weight aluminum ingot having the same composition as Example 4, manganese (Mn) addition amount is 0.1 to 2.9% by weight, magnesium (Mg) addition amount is Cast materials (6-1 and 6-2) within the range of 0.4 to 5.6% by weight were produced, and the steel wire was subjected to hot rolling and hot extrusion under the same conditions as in Example 4. Coating and cold drawing were performed to obtain an aluminum alloy covered steel wire having the same wire diameter and the same aluminum coating thickness as in Example 4.

  As Example 7, iron (Fe) 0.09 wt%, silicon (Si) 0.04 wt%, copper (Cu) 0.001 wt%, titanium (Ti) 0.001 wt%, vanadium (V) 0 .001% by weight, the balance of aluminum (Al) made of aluminum (Al) with a purity of about 99.86% by weight, the manganese (Mn) addition amount was set as a parameter within the range of 0.1 to 2.9% by weight. Cast materials (7-1, 7-2, and 7-3) were produced, and a rough drawn wire made of an aluminum alloy having a diameter of φ9.5 mm was obtained through a hot rolling process. Next, the steel wire was coated with an aluminum alloy using these rough drawn wires by a hot extrusion method. And the obtained composite wire was cold-drawn with a single-head wire drawing machine under the same conditions as in Examples 1 to 3 and 4 to 6 (1 pass reduction 25 ± 5%, wire drawing speed 20 m / min). An aluminum-clad steel wire 1 having a strand diameter of 2.6 mm and an aluminum alloy coating thickness of 0.17 mm was obtained.

  As Example 8, an aluminum ingot having the same composition as in Example 7 and having a purity of about 99.86% by weight, the magnesium (Mg) addition amount was within the range of 0.4 to 5.6% by weight, and Cast materials (8-1, 8-2, and 8-3) were manufactured, and hot rolling, coating on steel wire by hot extrusion, and cold drawing were performed under the same conditions as in Example 7. Thus, an aluminum-clad steel wire 1 having the same wire diameter and the same aluminum coating thickness as in Example 7 was obtained.

  As Example 9, an aluminum ingot having the same composition as Example 7 and having a purity of 99.86% by weight was added with a manganese (Mn) addition amount of 0.1 to 2.9% by weight and a magnesium (Mg) addition amount. Cast materials (9-1 and 9-2) having a content in the range of 0.4 to 5.6% by weight were produced, and the steel wire was subjected to hot rolling and hot extrusion under the same conditions as in Example 7. Coating and cold drawing were carried out to obtain an aluminum-clad steel wire 1 having the same wire diameter and the same aluminum coating thickness as in Example 7.

Comparative Example 1

  Further, as Comparative Example 1 of the aluminum-clad steel wire, casting was performed with manganese (Mn) added in an amount of 0.07% by weight on an aluminum metal having the same composition as in Examples 1 to 3 and having a purity of about 99.7% by weight. A material was prepared, hot rolled under the same conditions as in Examples 1 to 3, and the steel wire was coated and cold drawn by the hot extrusion method. An aluminum-clad steel wire with an aluminum coating thickness was obtained.

Comparative Example 2

  As Comparative Example 2, a cast material was prepared by adding 3.4% by weight of manganese (Mn) to an aluminum ingot having the same composition as in Examples 1 to 3 and having a purity of about 99.7% by weight. 1 to 3 under the same conditions as those in Examples 1 to 3, and coated with steel wire by cold extrusion and cold-drawn. Aluminum coated steel with the same wire diameter and aluminum coating thickness as in Examples 1 to 3 Got a line.

Comparative Example 3

  As Comparative Example 3, a cast material was produced by adding 0.2% by weight of magnesium (Mg) to an aluminum ingot having the same composition as in Examples 1 to 3 and having a purity of about 99.7% by weight. 1 to 3 under the same conditions as those in Examples 1 to 3, and coated with steel wire by cold extrusion and cold-drawn. Aluminum coated steel with the same wire diameter and aluminum coating thickness as in Examples 1 to 3 Got a line.

Comparative Example 4

  As Comparative Example 4, a cast material was produced by adding 6.4% by weight of magnesium (Mg) to an aluminum ingot having the same composition as Examples 1 to 3 and having a purity of about 99.7% by weight. ~ 3 under the same conditions as in hot rolling, hot extrusion coating on steel wire, and cold drawing, aluminum covered steel wire with the same wire diameter and aluminum coating thickness as in Examples 1-3 Got.

Comparative Example 5

  As Comparative Example 5, manganese (Mn) addition amount deviates from 0.1 to 2.9% by weight in an aluminum ingot having the same composition as Examples 1 to 3 and having a purity of about 99.7% by weight, and magnesium. A cast material (5-1 and 5-2) having a composition deviating from 0.4 to 5.6% by weight of (Mg) is produced, and hot rolled and hot under the same conditions as in Examples 1 to 3. The steel wire was coated and cold-drawn by an extrusion method to obtain an aluminum-clad steel wire having the same wire diameter and the same aluminum coating thickness as in Examples 1 to 3.

Comparative Example 6

  As Comparative Example 6, a cast material was prepared by adding 0.06% by weight of manganese (Mn) to an aluminum ingot having the same composition as Examples 4 to 6 and having a purity of about 99.8% by weight. Aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as those of Examples 4-6, which were hot-rolled under the same conditions as in 4-6, coated on a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 7

  As Comparative Example 7, a cast material was produced by adding 3.3% by weight of manganese (Mn) to an aluminum ingot having the same composition as in Examples 4 to 6 and having a purity of about 99.8% by weight. Aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as those of Examples 4-6, which were hot-rolled under the same conditions as in 4-6, coated on a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 8

  As Comparative Example 8, a cast material was produced by adding 0.2% by weight of magnesium (Mg) to an aluminum ingot having the same composition as Examples 4 to 6 and having a purity of about 99.8% by weight. Aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as those of Examples 4-6, which were hot-rolled under the same conditions as in 4-6, coated on a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 9

  As Comparative Example 9, a cast material was prepared by adding 6.6% by weight of magnesium (Mg) to an aluminum ingot having the same composition as Examples 4 to 6 and having a purity of about 99.8% by weight. Aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as those of Examples 4-6, which were hot-rolled under the same conditions as in 4-6, coated on a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 10

  As Comparative Example 10, the amount of manganese (Mn) addition deviates from 0.1 to 2.9% by weight in an aluminum ingot having a purity of about 99.8% by weight having the same composition as in Examples 4 to 6, and A cast material (10-1 and 10-2) having a composition deviating from 0.4 to 5.6% by weight of magnesium (Mg) was produced, and hot rolling and heat were performed under the same conditions as in Examples 4 to 6. The steel wire was coated and cold-drawn by a hot extrusion method to obtain an aluminum-clad steel wire having the same wire diameter and the same aluminum coating thickness as in Examples 4-6.

Comparative Example 11

  As Comparative Example 11, a cast material was produced by adding 0.07% by weight of manganese (Mn) to an aluminum ingot having the same composition as in Examples 7 to 9 and having a purity of about 99.86% by weight. An aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as in Examples 7-9, which was hot-rolled under the same conditions as 7-9, covered with a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 12

  As Comparative Example 12, a cast material was prepared by adding 3.5% by weight of manganese (Mn) to an aluminum ingot having the same composition as Examples 7 to 9 and having a purity of about 99.86% by weight. An aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as in Examples 7-9, which was hot-rolled under the same conditions as 7-9, covered with a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 13

  As Comparative Example 13, a cast material was produced by adding 0.1% by weight of magnesium (Mg) to an aluminum ingot having the same composition as Examples 7 to 9 and having a purity of about 99.86% by weight. An aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as in Examples 7-9, which was hot-rolled under the same conditions as 7-9, covered with a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 14

  As Comparative Example 14, a cast material was produced by adding 6.7% by weight of magnesium (Mg) to an aluminum ingot having the same composition as in Examples 7 to 9 and having a purity of about 99.86% by weight. An aluminum-clad steel with the same wire diameter and the same aluminum coating thickness as in Examples 7-9, which was hot-rolled under the same conditions as 7-9, covered with a steel wire by hot extrusion, and cold-drawn. Got a line.

Comparative Example 15

  As Comparative Example 15, the amount of manganese (Mn) addition deviated from 0.1 to 2.9% by weight in an aluminum ingot having a purity of about 99.86% having the same composition as in Examples 7 to 9, and A cast material (15-1 and 15-2) having a composition deviating from 0.4 to 5.6% by weight of magnesium (Mg) was produced, and hot rolling and heat were performed under the same conditions as in Examples 7 to 9. The steel wire was coated and cold-drawn by a hot extrusion method to obtain an aluminum-clad steel wire having the same wire diameter and the same aluminum coating thickness as in Examples 7-9.

Comparative Example 16

As Comparative Example 16, iron (Fe) 0.35 wt%, silicon (Si) 0.15 wt%, copper (Cu) 0.005 wt%, titanium (Ti) 0.003% wt, vanadium (V) 0 A cast material was prepared by adding manganese (Mn) to 3.5% by weight on an aluminum ingot having a purity of about 99.5% by weight, the balance being 0.002% by weight and the balance being aluminum (Al). A rough drawn wire made of an aluminum alloy having a diameter of 9.5 mm was obtained through a hot rolling process. Next, the steel wire was coated with an aluminum alloy using these rough drawn wires by a hot extrusion method. Then, the obtained composite wire was cold-drawn with a single-head wire drawing machine under conditions of 1-pass reduction 25 ± 5% and a drawing speed of 20 m / min, and the strand diameter was 2.6 mm and the aluminum alloy coating thickness was A 0.17 mm aluminum-clad steel wire 1 was obtained.

Comparative Example 17

  As Comparative Example 17, a cast material was produced by adding 6.0% by weight of magnesium (Mg) to an aluminum ingot having the same composition as Comparative Example 16 and having a purity of about 99.5% by weight. Under the same conditions, hot rolling, coating on a steel wire by hot extrusion, and cold drawing were performed to obtain an aluminum-clad steel wire having the same wire diameter and the same aluminum coating thickness as Comparative Example 16.

Comparative Example 18

  As Comparative Example 18, an aluminum ingot having the same composition as Comparative Example 16 and having a purity of about 99.5% by weight has a manganese (Mn) addition amount of 3.2% by weight and a magnesium (Mg) addition amount of 6.3%. A cast material was produced in weight%, and hot rolling, coating on a steel wire by hot extrusion, and cold drawing were performed under the same conditions as in Comparative Example 16, and the same wire diameter and the same as in Comparative Example 16 An aluminum-clad steel wire with an aluminum coating thickness was obtained.

Comparative Example 19

  As Comparative Example 19, iron (Fe) 0.04% by weight, silicon (Si) 0.03% by weight, and the balance was made of aluminum (Al) and the purity exceeded 99.9% by weight. A cast material was prepared, hot rolled under the same conditions as in Examples 1 to 9, coated on a steel wire by a hot extrusion method, cold drawn, and the same wire diameter as in Examples 1 to 9, An aluminum-clad steel wire having the same aluminum coating thickness was obtained.

Conventional Example 1

  Further, as conventional example 1 of the aluminum-clad steel wire, a cast material was prepared without adding an element to an aluminum metal having the same composition as that of Example 1 and having a purity of about 99.7% by weight. Were subjected to hot rolling, coating on a steel wire by hot extrusion, and cold drawing to obtain an aluminum-clad steel wire having the same wire diameter and the same aluminum coating thickness as in Example 1.

  Various performance evaluation was implemented about the above-mentioned Example, the comparative example, and the aluminum-clad steel wire of the prior art example. For the aluminum-clad steel wire, corrosion resistance was evaluated by an accelerated corrosion experiment, and the workability during wire drawing and the extent of surface defects were investigated. In the corrosion experiment, an aluminum-clad steel wire cut to a length of 30 mm was immersed in a 5% by weight hydrogen chloride aqueous solution for 140 minutes, and the relative corrosion resistance was evaluated by the amount of hydrogen gas generated during the progress of corrosion. Table 1 shows the performance evaluation results of various aluminum-clad steel wires.

In the aluminum-clad steel wire 1 of Examples 1 to 9, the amount of H ₂ gas generated when immersed in an aqueous hydrogen chloride solution is relatively small, and the corrosion resistance is good. In particular, Examples 1-3 and 3-2 , 4-3, 5-3, 6-2, 7-3, 8-3, 9-2 have performance comparable to that of Comparative Example 19 using high-purity aluminum having a purity of 99.9% by weight. Moreover, the ease of wire drawing and the surface quality of the wire drawing material are good, and there is no problem.

  Thus, by adding at least one of Mn and Mg within a specified range to aluminum in a purity range of 99.7 to 99.9% by weight, an aluminum-clad steel having excellent corrosion resistance and workability Line 1 can be obtained. On the other hand, for Comparative Examples 1 to 19 that deviate from the alloy composition described above, when the amount of the additive element is relatively small, sufficient corrosion resistance performance cannot be obtained, and when the amount of addition increases, the corrosion resistance increases, The wire-drawing process became difficult and the surface defects of the aluminum-clad steel wire 1 tended to increase. Further, in Comparative Examples 16 to 18 in which the purity of the aluminum ingot is 99.5% by weight, the effect is small even when manganese and magnesium are added beyond the specified range, and the corrosion resistance is the same as in Conventional Example 1 (purity 99 7% by weight metal base material (no element added), and there was a problem in wire drawing workability and surface quality.

  Next, an embodiment of the overhead electric wire 2 will be described.

As Example 10, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 1, and a purity of about 99.7 wt. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, the conductor effective area 160 mm ² of overhead conductors (10-1, 10-2, and, 10-3) 2 was produced.

As Example 11, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 2, and the electrical purity of about 99.7% by weight around the aluminum-clad steel wire 1 was twisted. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, the conductor effective area 160 mm ² of overhead conductors (11-1, 11-2, and, 11-3) 2 was produced.

As Example 12, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 3, and a purity of about 99.7 wt. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, overhead conductors (12-1 and 12-2) of the conductor effective area 160 mm ² 2 Was made.

As Example 13, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 4, and a purity of about 99.7 wt. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, the conductor effective area 160 mm ² of overhead conductors (13-1, 13-2, and, 13-3) 2 was produced.

As Example 14, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 5, and a purity of about 99.7 wt. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, the conductor effective area 160 mm ² of overhead conductors (14-1, 14-2, and, 14-3) 2 was produced.

As Example 15, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 6, and a purity of about 99.7% by weight of the electrical pure steel wire was laid around the aluminum-clad steel wire 1. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, overhead conductors (15-1 and 15-2) of the conductor effective area 160 mm ² 2 Was made.

As Example 16, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 7, and a purity of about 99.7% by weight of the electrical pure steel was encircled around that. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, the conductor effective area 160 mm ² of overhead conductors (16-1, 16-2, and, 16-3) 2 was produced.

As Example 17, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 8, and a purity of about 99.7% by weight of the electrical pure steel wire was laid around the aluminum-clad steel wire 1. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, the conductor effective area 160 mm ² of overhead conductors (17-1, 17-2, and, 17-3) 2 was produced.

As Example 18, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Example 9, and a purity of about 99.7% by weight of the electrical pure steel wire was laid around the aluminum-clad steel wire 1. aluminum conductor wires made of aluminum (Fai2.6Mm) 12 to 12, further combined the aluminum conductor wires 12 18-ply therearound, overhead conductors (18-1 and 18-2) of the conductor effective area 160 mm ² 2 Was made.

Comparative Example 20

Further, as Comparative Example 20 of the aluminum-clad steel wire, six same aluminum-clad steel wires 1 are twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 1, and the purity is 99.7 around that. Twisted 12 aluminum conductor wires (φ2.6 mm) 12 made of pure aluminum for electrical use with a weight percentage of about 18 and 18 aluminum conductor wires 12 around the aluminum conductor wires 12 to produce an overhead electric wire with a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 21

As Comparative Example 21, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 2, and a purity of about 99.7% by weight of the electrical pure steel wire was encircled therearound. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 22

As Comparative Example 22, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 3, and the electrical purity of about 99.7% by weight around the aluminum-clad steel wire 1 was twisted. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 23

As Comparative Example 23, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 4, and the electrical purity of about 99.7% by weight around that was covered. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 24

As Comparative Example 24, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 5, and a purity of about 99.7% by weight of the electrical pure steel wire was encircled therearound. Twelve aluminum conductor wires (φ2.6 mm) 12 made of aluminum, and 18 aluminum conductor wires 12 around the aluminum conductor wires 12, and overhead wires (24-1 and 24-2) having an effective conductor cross-sectional area of 160 mm ² Produced.

Comparative Example 25

As Comparative Example 25, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 6, and a purity of about 99.7% by weight of the electrical pure wire 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire characterized by a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 26

As Comparative Example 26, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 7, and a purity of about 99.7% by weight of the electrical pure steel wire was encircled therearound. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 27

As Comparative Example 27, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 8, and a purity of about 99.7% by weight of the electrical pure steel wire was encircled therearound. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 28

As Comparative Example 28, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 9, and the electrical purity of about 99.7% by weight around the aluminum-clad steel wire 1 was twisted. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 29

As Comparative Example 29, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 10, and the electrical purity having a purity of about 99.7 wt. Twelve aluminum conductor wires (φ2.6 mm) 12 made of aluminum, and 18 aluminum conductor wires 12 around the aluminum conductor wires 12, and overhead wires (29-1 and 29-2) having an effective cross-sectional area of 160 mm ² Produced.

Comparative Example 30

As Comparative Example 30, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 11, and a purity of about 99.7% by weight of the electrical pure steel wire was encircled therearound. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 31

As Comparative Example 31, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 12, and the electrical purity with a purity of about 99.7% by weight was formed around the wire. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 32

As Comparative Example 32, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 13, and the electrical purity having a purity of about 99.7% by weight around the aluminum-clad steel wire 1. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 33

As Comparative Example 33, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 14, and the electrical purity of about 99.7% by weight around that was covered. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 34

As Comparative Example 34, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 15, and a pure electrical wire having a purity of about 99.7% by weight around that wire. Twelve aluminum conductor wires (φ2.6 mm) 12 made of aluminum, and 18 aluminum conductor wires 12 around the aluminum conductor wires 12, and overhead wires (34-1 and 34-2) having an effective conductor cross-sectional area of 160 mm ² Produced.

Comparative Example 35

As Comparative Example 35, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 16, and a purity of about 99.7% by weight was produced around the aluminum-clad steel wire 1. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 36

As Comparative Example 36, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 17, and the electrical purity having a purity of about 99.7% by weight around the aluminum-clad steel wire 1. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 37

As Comparative Example 37, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 18, and a purity of about 99.7% by weight of electrical purity was used around that. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Comparative Example 38

As Comparative Example 38, six aluminum-clad steel wires 1 were twisted around the φ2.6 mm aluminum-clad steel wire 1 obtained in Comparative Example 19, and about 99.7 wt. 12 aluminum conductor wires (φ2.6 mm) 12 made of aluminum and 18 aluminum conductor wires 12 around the aluminum conductor wire 12 were twisted to produce an overhead electric wire having a conductor effective cross-sectional area of 160 mm ² .

Conventional example 2

In addition, as conventional example 2 of the overhead electric wire, six aluminum covered steel wires are twisted around the φ2.6 mm aluminum covered steel wire obtained in conventional example 1 of aluminum covered steel wire 1, and purity 99 Twisted 12 aluminum conductor wires (φ2.6mm) made of pure aluminum for electrical use of about 7% by weight, and 18 aluminum conductor wires around the aluminum conductor wire to produce an overhead electric wire with a conductor effective cross-sectional area of 160mm ² .

Conventional example 3

In addition, as conventional example 3 of the overhead electric wire, six same hot-dip galvanized steel wires are twisted around a φ2.6 mm hot-dip galvanized steel wire, and pure aluminum for electrical use having a purity of about 99.7% by weight is wound around the wire. 12 aluminum conductor wires (φ2.6 mm) and 18 aluminum conductor wires were twisted around the aluminum conductor wires to produce an overhead electric wire with a conductor effective cross-sectional area of 160 mm ² .

  About the overhead electric wire of an above-described Example, a comparative example, and a prior art example, corrosion resistance was investigated by the corrosion acceleration experiment, and it evaluated together with wire drawing workability. In the corrosion experiment, an electrolytic solution prepared by adding sulfuric acid to a 5% by weight sodium chloride aqueous solution and adjusting the pH to 4 under the condition that the overhead wire is installed horizontally and the transformer is energized so that the wire temperature becomes 90 ° C. The spraying was carried out for 10 minutes and the atmospheric standing for 140 minutes as one cycle, and this was repeated. Table 2 shows the results of examining the progress of corrosion of each layer wire after 8000 cycles of corrosion experiments as the results of performance evaluation of various overhead wires.

  Compared with the overhead electric wire 3 of the embodiment of the present invention, the overhead wire using the galvanized steel wire of the conventional example 3 has a large degree of corrosion, and the galvanized layer disappears over the entire area of the steel wire, and the steel ground is exposed. At the same time, aluminum conductor wires were frequently broken due to corrosion in the outer and inner layers. This shows that corrosion of overhead wires is largely governed by the steel ground exposure of steel wires.

  Moreover, in the overhead electric wires of Examples 10 to 18 of the present invention, no steel ground exposure of the aluminum-covered steel wire 1 is recognized, and the inner-layer aluminum conductor wire 12 in contact with the aluminum-covered steel wire 1 and the outer-layer aluminum located on the outside thereof The degree of corrosion progress of the conductor wire 12 was also slight. In particular, in Examples 10-3, 11-3, 12-2, 13-3, 14-3, 15-2, 16-3, 17-3, 18-2, a high purity of 99.9% by weight An appearance appearance equivalent to that of Comparative Example 38 using aluminum was exhibited.

  As described above, the aluminum-clad steel wire 1 having the aluminum covering portion 11 in which at least one of Mn and Mg is added within a specified range with respect to aluminum having a purity of 99.7 to 99.9% by weight is used. Thus, it is possible to improve the corrosion resistance of the entire overhead electric wire. On the other hand, in Comparative Examples 20 to 34 that deviate from the alloy composition described above, when the amount of the additive element is relatively small, a sufficient corrosion resistance effect cannot be obtained, and the steel ground exposure of the steel wire and the resulting corrosion of the aluminum conductor wire. Progress will be recognized. Moreover, although the corrosion resistance increased as the amount added increased, the surface defects of the aluminum-clad steel wire 1 tended to increase. Moreover, about the comparative examples 35-37 whose purity of the aluminum coating | coated part in an aluminum-clad steel wire is 99.5 weight%, even if it adds manganese and magnesium exceeding a prescription | regulation range, there is not only an improvement effect of corrosion resistance. This is a result of problems in wire drawing workability and surface quality.

  Next, an example of the overhead ground wire 3 will be described.

As Example 19, a formed aluminum-clad steel wire 15 having the same composition and the same manufacturing process as in Example 1 and having a cross-sectional area of φ3.23 mm is provided around an aluminum pipe 13 of φ5.0 mm containing the optical fiber unit 14. six twisted, overhead ground wire cross-sectional area 55 mm ² (19-1 and 19-2, and 19-3) 3 were prepared.

As Example 20, a formed aluminum-covered steel having the same composition as Example 2 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, overhead ground wire cross-sectional area 55 mm ² (20-1 and 20-2, and 20-3) 3 were prepared.

As Example 21, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained by the same composition and the same manufacturing process as Example 3 around the same aluminum pipe 13 as Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a cross-sectional area 55 mm ² of the ground wire (21-1 and 21-2) 3.

As Example 22, a molded aluminum-covered steel having the same composition as Example 4 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, overhead ground wire cross-sectional area 55 mm ² (22-1 and 22-2, and 22-3) 3 were prepared.

As Example 23, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and the same manufacturing process as Example 5 around the same aluminum pipe 13 as Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, overhead ground wire cross-sectional area 55 mm ² (23-1 and 23-2, and 23-3) 3 were prepared.

As Example 24, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and the same manufacturing process as Example 6 around the same aluminum pipe 13 as Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a cross-sectional area 55 mm ² of the ground wire (24-1 and 24-2) 3.

As Example 25, a formed aluminum-covered steel having a composition equivalent to that of Example 7 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as that of Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, overhead ground wire cross-sectional area 55 mm ² (25-1 and 25-2, and 25-3) 3 were prepared.

As Example 26, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and the same manufacturing process as Example 8 around the same aluminum pipe 13 as Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, overhead ground wire cross-sectional area 55 mm ² (26-1, 26-2, and 26-3) 3 were prepared.

As Example 27, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and the same manufacturing process as Example 9 around the same aluminum pipe 13 as Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a cross-sectional area 55 mm ² of the ground wire (27-1 and 27-2) 3.

Comparative Example 39

Further, as Comparative Example 39 of the overhead ground wire 3, the φ3.23 mm section obtained in the same composition and the same manufacturing process as that of Comparative Example 1 was cut around the same aluminum pipe 13 as in Example 19 in which the optical fiber unit 14 was accommodated. Six formed aluminum-covered steel wires 15 corresponding to the area were twisted to produce an aerial ground wire having a cross-sectional area of 55 mm ² .

Comparative Example 40

As comparative example 40, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained by the same composition and the same manufacturing process as in comparative example 2 around the same aluminum pipe 13 as in example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 41

As Comparative Example 41, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 3 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 42

As Comparative Example 42, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 4 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 43

As Comparative Example 43, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 5 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-strand, were prepared ground wire cross-sectional area 55 mm ² (the 43-1 and 43-2).

Comparative Example 44

As Comparative Example 44, a molded aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 6 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 45

As Comparative Example 45, a formed aluminum-clad steel equivalent to φ3.23 mm cross-sectional area obtained by the same composition and the same manufacturing process as Comparative Example 7 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 46

As Comparative Example 46, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained by the same composition and the same manufacturing process as Comparative Example 8 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 47

As Comparative Example 47, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 9 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 48

As Comparative Example 48, a molded aluminum-covered steel having the same composition as Comparative Example 10 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-strand, were prepared ground wire cross-sectional area 55 mm ² (the 48-1 and 48-2).

Comparative Example 49

As Comparative Example 49, a molded aluminum-covered steel having the same composition as Comparative Example 11 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as in Example 19 in which the optical fiber unit 14 was accommodated. the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 50

As Comparative Example 50, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 12 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 51

As Comparative Example 51, a molded aluminum-covered steel having the same composition as Comparative Example 13 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 52

As Comparative Example 52, a molded aluminum-covered steel having the same composition as Comparative Example 14 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 53

As Comparative Example 53, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 15 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-strand, were prepared ground wire cross-sectional area 55 mm ² (the 53-1 and 53-2).

Comparative Example 54

As Comparative Example 54, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and manufacturing process as Comparative Example 16 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-strand, were prepared ground wire cross-sectional area 55 mm ^2.

Comparative Example 55

As Comparative Example 55, a molded aluminum-covered steel having the same composition as Comparative Example 17 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 56

As Comparative Example 56, a molded aluminum-covered steel having the same composition as Comparative Example 18 and a φ3.23 mm cross-sectional area obtained in the same manufacturing process around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Comparative Example 57

As Comparative Example 57, a molded aluminum-covered steel equivalent to φ3.23 mm cross-sectional area obtained in the same composition and the same manufacturing process as Comparative Example 19 around the same aluminum pipe 13 as in Example 19 containing the optical fiber unit 14 the line 15 combined 6-ply, to produce a ground wire cross-sectional area 55 mm ^2.

Conventional example 4

Further, as conventional example 4 of the overhead ground wire, the same composition and the same manufacturing process as in conventional example 1 of aluminum-clad steel wire 1 are obtained around the same aluminum pipe 13 as in Example 19 in which the optical fiber unit 14 is accommodated. Six formed aluminum-covered steel wires 15 corresponding to φ3.23 mm cross-sectional area were twisted to produce an overhead ground wire having a cross-sectional area of 55 mm ² .

  About the overhead ground wire of an above-described Example, a comparative example, and a prior art example, while performing the corrosion experiment on the same conditions as an overhead electric wire, it evaluated together with the wire drawing workability of the shaping | molding aluminum covering steel wire 15. FIG. Table 3 shows the performance evaluation results for various overhead ground wires.

  In the aerial ground wire 3 of Examples 19 to 27, any steel ground exposure of the formed aluminum covered steel wire 15 is not recognized, and the corrosion degree of the aluminum pipe 13 for housing the optical fiber unit 14 in contact with this is relatively small. Met. In particular, in Examples 19-3, 20-3, 21-2, 22-3, 23-3, 24-2, 25-3, 26-3, 27-2, a high purity of 99.9% by weight was obtained. The appearance appearance was inferior to that of Comparative Example 57 using aluminum.

  As described above, the formed aluminum-covered steel wire 15 having the aluminum covering portion 11 in which at least one of Mn and Mg is added within a specified range with respect to aluminum having a purity of 99.7 to 99.9% by weight is used. Thus, the corrosion resistance of the entire overhead ground wire 3 can be improved. On the other hand, in Comparative Examples 39 to 53 that deviate from the above alloy composition, when the amount of the additive element is relatively small, the steel wire is exposed to the steel ground, the aluminum pipe 13 is clearly corroded, and deformation due to corrosion product accumulation is confirmed. In addition, although the corrosion resistance increases as the amount added increases, the surface defects of the formed aluminum-covered steel wire 15 tend to increase. Further, in Comparative Examples 54 to 56 in which the purity of the aluminum coating portion in the aluminum-clad steel wire is 99.5% by weight, no effect of improving the corrosion resistance is observed even if manganese and magnesium are added beyond the specified range. At the same time, the wire drawing workability and surface quality of the aluminum-clad steel wire are poor, which is a problematic result.

  In this embodiment, the case of an aluminum-covered steel core aluminum stranded wire (ACSR / AC) using a pure aluminum wire for electrical use with a purity of about 99.7% by weight as the conductor has been described. However, a heat-resistant aluminum alloy wire is used as the conductor wire. The same effect can be obtained even if the types of wires such as the stranded steel heat-resistant aluminum alloy (TACSR / AC) used are different.

  In addition, in the overhead ground wire, the aluminum-clad steel wire is described as being formed aluminum-clad steel wire (fan-shaped cross-sectional shape), but the same effect can be obtained in the case of a normal round wire (circular cross-sectional shape). .

  Furthermore, in this embodiment, the case where pure aluminum for electrical use having a purity of about 99.7% by weight was used for the aluminum pipe of the overhead ground wire was described, but by applying the aluminum alloy according to the claims, the overhead ground wire Needless to say, the overall corrosion resistance is further improved.

FIG. 1 is a cross-sectional view of an aluminum alloy-coated steel wire (aluminum-covered steel wire) according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of an overhead electric wire according to the second embodiment of the present invention. FIG. 3 is a cross-sectional view showing an optical fiber composite ground wire according to the third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Aluminum alloy coated wire (aluminum covered steel wire), 2 ... Overhead electric wire, 3 ... Overhead ground wire, 10 ... Steel wire, 11 ... Aluminum coating part, 12 ... Aluminum conductor wire, 13 ... Aluminum pipe, 14 ... Optical fiber Unit, 15 ... Molded aluminum covered steel wire

Claims (6)

  It has an aluminum covering portion provided so as to cover the outer periphery of the steel wire, wherein at least one of manganese and magnesium is added to aluminum having a purity of 99.7% by weight or more and not exceeding 99.9% by weight. Aluminum-clad steel wire characterized by   2. The aluminum-clad steel wire according to claim 1, wherein the aluminum covering portion is made of an aluminum alloy in which the manganese is added to the aluminum in a range of 0.1 to 2.9 wt%.   2. The aluminum-clad steel wire according to claim 1, wherein the aluminum covering portion is made of an aluminum alloy in which the magnesium is added to the aluminum in a range of 0.4 to 5.6 wt%.   The said aluminum coating | coated part consists of the aluminum alloy which added the said manganese to the said aluminum in the range of 0.1-2.9 weight% and the said magnesium in the range of 0.4-5.6 weight%. The aluminum-clad steel wire according to 1. The aluminum-clad steel wire according to any one of claims 1 to 4,
An overhead electric wire comprising: a plurality of aluminum conductor wires arranged in a circumferential direction on an outer periphery of the aluminum covered steel wire. An optical fiber unit having a plurality of optical fiber strands;
An aluminum pipe for housing the optical fiber unit;
An aerial ground wire comprising the aluminum-clad steel wire according to any one of claims 1 to 4 disposed in a circumferential direction on an outer periphery of the aluminum pipe.

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