KR101754341B1 - Overhead electric wires, high strength corrosion resistant steel wires used thereto, and methods for manufacturing the same - Google Patents
Overhead electric wires, high strength corrosion resistant steel wires used thereto, and methods for manufacturing the same Download PDFInfo
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- KR101754341B1 KR101754341B1 KR1020150155172A KR20150155172A KR101754341B1 KR 101754341 B1 KR101754341 B1 KR 101754341B1 KR 1020150155172 A KR1020150155172 A KR 1020150155172A KR 20150155172 A KR20150155172 A KR 20150155172A KR 101754341 B1 KR101754341 B1 KR 101754341B1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
Abstract
A machined transmission line, a high strength corrosion resistant steel wire used therein, and a method of manufacturing the same are disclosed. According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, which comprises 0.05 to 0.3 parts by weight of C, 5.5 to 8.5 parts by weight of Ni, 15.0 to 18.8 parts by weight of Cr, 0.2 to 8 parts by weight of Mn, A high-strength corrosion-resistant steel wire comprising 1.5 parts by weight of Si, 0.2 to 0.9 parts by weight of Si, 0.5 to 1.5 parts by weight of Al, and Fe and other unavoidable impurities may be provided.
Description
The present invention relates to a machined transmission line, a high strength corrosion resistant steel wire used therein, and a method of manufacturing the same.
Generally, the machined transmission line is extended through a plurality of steel towers provided at predetermined intervals on the ground. Therefore, the working transmission line is required to have mechanical properties capable of achieving low-dip characteristics in order to prevent sagging.
The ACSR (Aluminum Stranded Conductors Steel Reinforced), which is used as a conventional transmission line, has a structure in which the core is disposed at the center of the transmission line and the aluminum conductor surrounds the core. The steel core is made up of seven strands of high carbon steel wire.
The total load of the overhead transmission line is divided by the ratio of about 6: 4 for each of the rigid and aluminum conductors. However, since the aluminum conductor also plays a role of transmission, the tensile strength is lowered due to the increase of the temperature during the transmission, and the deflection of the working transmission line can be intensified. As a result, the transmission capacity of the overhead transmission line can not help but be limited. In order to solve such a problem, studies on a steel wire material having a high tensile strength that can replace a high carbon steel wire conventionally used have been actively conducted. If the transmission line is fabricated using a high tensile strength steel wire material, it is possible to reduce the load sharing ratio of the aluminum conductor, thereby replacing the light alloy conventionally used for the aluminum conductor with the soft aluminum having a relatively high conductivity or reducing the cross- The transmission capacity of the machining power transmission line can be increased by increasing the cross-sectional area of the aluminum conductor.
In addition to the above-mentioned high tensile strength, a low linear expansion coefficient and excellent corrosion resistance may be required for a steel wire material.
The low linear expansion coefficient of the steel wire material can reduce the sagging phenomenon of the transmission line caused by the increase of the length due to the rise of the steel wire and the excellent corrosion resistance of the steel wire material can be caused by the mechanical properties It is possible to prevent degradation. Conventionally, as a method for improving the corrosion resistance of a steel wire material, a steel wire plated with zinc or coated with aluminum is used as the steel wire, but there is a problem in that an additional process is required.
The embodiments of the present invention can provide a machined transmission line using a high strength corrosion resistant steel wire having a high tensile strength and a high corrosion resistance compared to a high carbon steel wire used in a conventional transmission line and a high strength corrosion resistant steel wire used therefor, have.
According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, which comprises 0.05 to 0.3 parts by weight of C, 5.5 to 8.5 parts by weight of Ni, 15.0 to 18.8 parts by weight of Cr, 0.2 to 8 parts by weight of Mn, A high-strength corrosion-resistant steel wire comprising 1.5 parts by weight of Si, 0.2 to 0.9 parts by weight of Si, 0.5 to 1.5 parts by weight of Al, and Fe and other unavoidable impurities may be provided.
The steel wire may be roughened by a solution treatment for quenching after heating to 1000 ° C to 1100 ° C and a precipitation hardening heat treatment for reheating to a predetermined temperature.
The coefficient of linear expansion of the steel wire may be 11.0 占 퐉 / 占 폚.
The tensile strength of the steel wire may be 160 kgf / mm 2 to 200 kgf / mm 2.
According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: 0.05 to 0.3 parts by weight of C, 5.5 to 8.5 parts by weight of Ni, 15.0 to 18.8 parts by weight of Cr, 0.2 to 8 parts by weight of Mn, 1.5 to 1.5 parts by weight of Si, 0.2 to 0.9 parts by weight of Si, 0.5 to 1.5 parts by weight of Al, and the balance of Fe and other unavoidable impurities; A second step of drawing a steel wire by drawing the alloy steel; A third step of heating the steel wire to 1000 ° C to 1100 ° C and then quenching the steel wire; And a fourth step of performing a precipitation hardening heat treatment for reheating the steel wire to a predetermined temperature.
The coefficient of linear expansion of the steel wire may be 11.0 占 퐉 / 占 폚.
The tensile strength of the steel wire may be 160 kgf / mm 2 to 200 kgf / mm 2.
According to another aspect of the present invention, there is provided a steel cord comprising: a steel core comprising a plurality of steel wires stranded and a conductor surrounding the steel core, wherein the steel wire comprises 0.05 to 0.3 parts by weight of C, 0.5 to 1.5 parts by weight of Al, 0.5 to 1.5 parts by weight of Al, 0.5 to 1.5 parts by weight of Al, and the balance of Fe And other unavoidable impurities, which are used in the process of the present invention, can be provided.
The steel wire may be roughened by a solution treatment for quenching after heating to 1000 ° C to 1100 ° C and a precipitation hardening heat treatment for reheating to a predetermined temperature.
The coefficient of linear expansion of the steel wire may be 11.0 占 퐉 / 占 폚.
The tensile strength of the steel wire may be 160 kgf / mm 2 to 200 kgf / mm 2.
The conductor may be formed of a plurality of trapezoidal aluminum strands and may wrap the core in a cylindrical shape.
The aluminum strand may be formed in multiple layers.
The aluminum strand may be formed in multiple layers, and the inner layer and the outer layer may be twisted in mutually opposite directions.
The aluminum strand may be made of a soft aluminum material.
According to the embodiments of the present invention, the high-strength corrosion-resisting steel wire has a high tensile strength and a low linear expansion coefficient as compared with the high-carbon steel wire used in the conventional working transmission line, thereby improving the diagonal characteristics of the transmission line. So that the service life of the transmission line can be prolonged and reliability can be improved during the use period.
1 is a view illustrating a method of manufacturing a high strength corrosion resistant steel wire according to an embodiment of the present invention.
2 is a diagram illustrating an example of a machined transmission line according to another embodiment of the present invention.
Fig. 3 is a cross-sectional view of the overhead transmission line of Fig. 2;
4 is a view showing another example of a processed transmission line according to another embodiment of the present invention.
Figure 5 is a cross-sectional view of the overhead power transmission line of Figure 4;
6 is a view illustrating a method of manufacturing a processed transmission line according to another embodiment of the present invention.
FIG. 7 is a schematic view illustrating a process of fabricating a transmission line according to another embodiment of the present invention. Referring to FIG.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.
In the present application, when a component is referred to as "comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise. Also, throughout the specification, the term "on" means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction.
Furthermore, the term " coupled " does not mean that only a physical contact is made between the respective components in the contact relation between the respective constituent elements, but the other components are interposed between the respective constituent elements, It should be used as a concept to cover until the components are in contact with each other.
The sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.
The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a transmission line according to the present invention, a high-strength corrosion-resistant steel wire and a method of manufacturing the same will be described in detail with reference to the accompanying drawings. In the following description, The same reference numerals are assigned to the same elements and a duplicate description thereof will be omitted.
1 is a view illustrating a method of manufacturing a high strength corrosion resistant steel wire according to an embodiment of the present invention.
Referring to FIG. 1, a method of manufacturing a high strength corrosion-resisting steel wire according to an embodiment of the present invention includes steps S100, S111, S120, and S130, . ≪ / RTI >
First, 0.05 to 0.3 parts by weight of C, 5.5 to 8.5 parts by weight of Ni, 15.0 to 18.8 parts by weight of Cr, 0.2 to 1.5 parts by weight of Mn, 0.2 to 1.5 parts by weight of Si, 0.2 to 0.9 parts by weight of Al, 0.5 to 1.5 parts by weight of Al, and the balance of Fe and other unavoidable impurities (S100).
Alloy steel manufacturing processes may include milling, steelmaking and continuous casting processes well known in the art.
Alloy steels can be cast into a slab-like intermediate product through a continuous casting process and then produced in a rod form through a hot rolling process. On the other hand, the rod may be subjected to a heat treatment to recover the internal nonuniformity generated during hot rolling, and may be washed with an acid to remove surface scale and the like.
Next, a steel wire can be manufactured by drawing the alloyed steel produced in the form of a rod (S110). The steel wire manufactured by the drawing process is subjected to a solution treatment at a temperature of 1000 ° C to 1100 ° C, (S120, S130). The heat treatment is carried out in the order of 480 ° C to 570 ° C, preferably 482 ° C, for 1 hour and then air cooling. As a result, the strength of the high-strength corrosion-resisting steel wire fabricated according to one embodiment of the present invention can be improved through solidification of reinforcement, work hardening and precipitation hardening, and the passive film of the main component is chromium oxide on the surface of the high- The corrosion resistance can be improved. The tensile strength of the high strength corrosion-resisting steel wire fabricated according to an embodiment of the present invention may be 160 kgf / mm 2 to 200 kgf / mm 2, the elongation at 1.5% or more, and the linear expansion coefficient 11.0 탆 / ° C.
Hereinafter, the content of the high-strength corrosion-resistant steel wire fabricated according to one embodiment of the present invention will be described.
Carbon (C) is a component contributing to the improvement of the strength of the steel wire. If the carbon content is too low, it is difficult to expect an effective strength improvement. On the other hand, if the carbon content is too high, it becomes difficult to obtain necessary elongation by lowering the ductility. It may cause chromium deficiency in the grain boundaries. Therefore, it is preferable to limit the content to 0.05 part by weight to 0.3 part by weight.
Nickel (Ni) contributes to the stabilization of austenite. If the nickel content is too low, it is difficult to expect austenite stabilization. On the other hand, if the nickel content is excessively high, To 5.5 parts by weight to 8.5 parts by weight.
Chromium (Cr) contributes to the improvement of the corrosion resistance of the steel wire and contributes to the stabilization of austenite together with nickel. If the chromium content is too low, it is difficult to expect effective corrosion resistance and austenite stabilization. However, if the chromium content is too high It is difficult to obtain necessary elongation by lowering ductility. Therefore, the content is preferably limited to 15.0 parts by weight to 18.8 parts by weight.
Manganese (Mn) functions as a deoxidizing agent in the smelting of a molten metal and contributes to the stabilization of austenite together with nickel. When the manganese content is too low, it is difficult to expect an effect as a deoxidizer and stabilization of austenite. It is preferable to limit the content to 0.2 parts by weight to 1.5 parts by weight.
Silicon (Si) functions as a deoxidizer when smelting molten steel and improves the mechanical properties of the steel wire and solidifies it to lower the stacking defect energy. When the silicon content is too low, it is difficult to expect the effect as a deoxidizing agent and effective mechanical properties. Is too high, it is difficult to obtain necessary elongation by lowering the ductility, so that the content thereof is preferably limited to 0.2 part by weight to 0.9 part by weight.
Aluminum (Al) forms an intermetallic compound and contributes to the improvement of the strength of the steel wire. If the aluminum content is too low, it is difficult to expect an effective strength improvement. On the other hand, if the aluminum content is too high, It is difficult to obtain an elongation. Therefore, the content thereof is preferably limited to 0.5 to 1.5 parts by weight.
2 is a cross-sectional view of the overhead power transmission line of Fig. 2, Fig. 4 is a cross-sectional view of another example of the overhead power transmission line according to another embodiment of the present invention, Fig. Fig. 5 is a cross-sectional view of the working power transmission line of Fig. 4. Fig.
2 through 5, the processed
The
The
The
Although the cross section of the
When the cross section of the
The
The
Hereinafter, the processed transmission line according to another embodiment of the present invention will be described in comparison with a conventional ACSR (Aluminum Stranded Conduit Steel Reinforced).
Table 1 shows a machined transmission line according to another embodiment of the present invention and a conventional ACSR.
Outer diameter
(mm)
(mm) / number
(mm 2 )
(kgf / mm 2 )
(μm / ° C.)
(mm) / number
(mm 2 )
(kgf / mm 2 )
Referring to Table 1, the comparative example is a conventional ACSR, and Examples 1 and 2 are transmission lines according to another embodiment of the present invention. In Example 1, the tensile strength is 160 kgf / mm < 2 > And the second embodiment uses a steel wire having a tensile strength of 195 kgf / mm < 2 >. Comparative Example, Example 1 and Example 2 were fabricated to have the same specifications, for example, the same core thickness and conductor cross section.
Table 2 shows the electrical and mechanical properties of a machined transmission line and a conventional ACSR according to another embodiment of the present invention.
Referring to Table 2, it is confirmed that the electrical resistances of Examples 1 and 2 are as low as 2.7% as compared with the electrical resistances of the comparative examples. The electrical resistance affects the amount of heating and the temperature rise when current flows through the working transmission line, and consequently low electrical resistance can improve the diagonal characteristics of the working transmission line. It is also confirmed that the tensile load of Example 2 is higher by 12% than the tensile load of the comparative example. A high tensile load can improve the transient characteristics of the overhead transmission line. On the other hand, although the tensile load of Example 1 was found to be almost the same as the tensile load of the comparative example, it can be said that a good result is obtained when a soft aluminum material having a low load sharing ratio is used instead of a conductor having high conductivity. In addition, the allowable currents of Examples 1 and 2 are confirmed to be as high as 56% and 89%, respectively, in comparison with the allowable current of the comparative example under the same island condition. As a result, the transmission capacities of the first and second embodiments may be significantly higher than the transmission capacities of the comparative example.
Table 3 shows the changes in temperature of the machined transmission line and the conventional ACSR according to another embodiment of the present invention.
Referring to Table 3, it can be seen that the gutters of Examples 1 and 2 are as small as 0.71 m and 2.01 m, respectively, as compared with that of the comparative example under the condition of the continuous allowable temperature of the working power transmission line of 90 캜. The small islands not only enable the transmission capacity to be increased, but also increase the distance between the towers, thereby reducing the cost of constructing the towers and transmission lines.
Table 4 shows the tensile strength retention ratio according to the corrosion test of the machined transmission line according to another embodiment of the present invention and the conventional ACSR. Corrosion test was conducted with 35g / ℓ of brine solution with reference to KS D ISO 11130. Corrosion test was conducted by repeating immersion and drying at a constant time interval for 1000 hours in a brine solution of 35g / .
Referring to Table 4, it can be seen that the compressive tensile strength of the comparative example decreases with exposure to the corrosive environment, whereas the compressive tensile strength of the embodiment is improved rather than exposed to the corrosive environment. This is because the steel wire fabricated according to one embodiment of the present invention is a precipitation hardening type stainless steel wire and the tensile strength can be improved by natural age hardening during a certain period of time.
Table 5 shows the corrosion test results of the machined transmission line according to another embodiment of the present invention and the conventional ACSR.
Referring to Table 5, it was confirmed that, on the surface of the steel wire of the comparative example, discoloration due to corrosion and traces of fitting were observed along with a large amount of brine adhesion, while no change was observed on the surface of the steel wire of the example. As described above, when the steel wire fabricated according to one embodiment of the present invention is used, the corrosion resistance is very excellent, so that a process for zinc plating or aluminum coating on the steel wire is not required.
Table 6 shows the corrosion resistance relationship between two materials in contact with each other in the atmospheric environment.
cast iron
galvanized steel
/ cast iron
/ galvanized steel
As shown in Table 6, when the area of the conductor is larger than the area of the steel core in the corrosion resistance relation with the contact of the aluminum material, the strength of the stainless steel material, as in the transmission line according to another embodiment of the present invention, + ', Indicating no contact corrosion problem.
FIG. 6 is a view illustrating a method of manufacturing a transmission line according to another embodiment of the present invention. FIG. 7 is a schematic view illustrating a process of fabricating a transmission line according to another embodiment of the present invention. FIG.
6 and 7, a method of manufacturing a machined transmission line according to another embodiment of the present invention includes steps of supplying a steel cord (S200), supplying a primary aluminum strand (S210), forming an inner layer (S220) An aluminum strand feeding step S230, an outer layer forming step S240, and a machining power line winding step S250.
First, the
The
The
Next, a plurality of
Next, a plurality of
The plurality of
Next, the machining
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.
10: Transmission line
100: Severe
110: Steel wire
200: conductor
210: Aluminum wire
300: 1st bobbin
310: first twisted pair
320: 2nd bobbin
330: second twisted pair machine
340: Third bobbin
350: Drums
Claims (15)
Wherein the coefficient of linear expansion of the steel wire is 11.0 占 퐉 / 占 폚.
Wherein the steel wire is subjected to a solution treatment for quenching after heating to 1000 占 폚 to 1100 占 폚 and a precipitation hardening heat treatment for reheating to 480 占 폚 to 570 占 폚.
Wherein the tensile strength of the steel wire is 160 kgf / mm 2 to 200 kgf / mm 2.
A second step of drawing a steel wire by drawing the alloy steel;
A third step of heating the steel wire to 1000 ° C to 1100 ° C and then quenching the steel wire; And
And a fourth step of performing a precipitation hardening heat treatment for reheating the steel wire to 480 캜 to 570 캜,
Wherein the coefficient of linear expansion of the steel wire is 11.0 占 퐉 / 占 폚.
Wherein the tensile strength of the steel wire is 160 kgf / mm 2 to 200 kgf / mm 2.
Wherein the coefficient of linear expansion of the steel wire is 11.0 占 퐉 / 占 폚.
Characterized in that the steel wire is subjected to a solution treatment process in which the steel wire is quenched after heating to 1000 占 폚 to 1100 占 폚 and a precipitation hardening heat treatment in which the wire is reheated to 480 占 폚 to 570 占 폚.
Wherein the tensile strength of the steel wire is 160 kgf / mm 2 to 200 kgf / mm 2.
Wherein the conductor is formed of a plurality of trapezoidal aluminum strands, and the conductor is wrapped in a cylindrical shape.
Wherein the aluminum strand is formed in a multi-layered structure.
Wherein the aluminum strand is formed in a multilayer structure, and the inner layer and the outer layer are twisted in opposite directions to each other.
Characterized in that the aluminum strand is made of a soft aluminum material.
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| KR1020150155172A KR101754341B1 (en) | 2015-11-05 | 2015-11-05 | Overhead electric wires, high strength corrosion resistant steel wires used thereto, and methods for manufacturing the same |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5144269B2 (en) * | 2005-10-11 | 2013-02-13 | 独立行政法人科学技術振興機構 | High-strength Co-based alloy with improved workability and method for producing the same |
| KR101351239B1 (en) * | 2012-11-15 | 2014-01-15 | (주)메탈링크 | Manufacturing method and apparatus of trapezoidal aluminumalloy wire for overhead power transmission cable |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5144269B2 (en) * | 2005-10-11 | 2013-02-13 | 独立行政法人科学技術振興機構 | High-strength Co-based alloy with improved workability and method for producing the same |
| KR101351239B1 (en) * | 2012-11-15 | 2014-01-15 | (주)메탈링크 | Manufacturing method and apparatus of trapezoidal aluminumalloy wire for overhead power transmission cable |
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