CN111416220A - Copper-clad steel grounding rod, manufacturing method thereof and lightning protection grounding device - Google Patents
Copper-clad steel grounding rod, manufacturing method thereof and lightning protection grounding device Download PDFInfo
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- CN111416220A CN111416220A CN202010309604.XA CN202010309604A CN111416220A CN 111416220 A CN111416220 A CN 111416220A CN 202010309604 A CN202010309604 A CN 202010309604A CN 111416220 A CN111416220 A CN 111416220A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
Abstract
The invention discloses a copper-clad steel grounding rod and a manufacturing method thereof as well as a lightning protection grounding device, wherein the manufacturing method comprises the steps of selecting a copper pipe and a steel rod, and respectively cleaning the inner surface of the copper pipe and the outer surface of the steel rod to remove oil stains on the inner surface of the copper pipe and oxide skins on the outer surface of the steel rod; sleeving a steel bar in a copper pipe to form a copper-clad steel blank; heating the copper-clad steel blank; rolling, compressing and quenching the heated copper-clad steel blank; cutting off the rolled and compressed copper-clad steel blank according to a set diameter; and processing external threads on the cut copper-clad steel blank to obtain the copper-clad steel grounding rod. The copper-clad steel grounding rod is produced by adopting a hot rolling process, the steel rod is sleeved into the copper pipe through a sleeve method, and the copper and steel metal materials are physically combined through rolling, so that the manufacturing process is environment-friendly and pollution-free, the bonding force of the copper and steel metal materials is stronger, the strength of the grounding rod is higher after quenching, the grounding rod is not easy to bend during construction, and the material cost can be effectively saved.
Description
Technical Field
The invention relates to the technical field of lightning protection grounding equipment, in particular to a manufacturing method of a copper-clad steel grounding rod; the invention also relates to a copper-clad steel grounding rod produced by the manufacturing method; the invention also relates to a lightning protection grounding device with the copper-clad steel grounding rod produced by the manufacturing method.
Background
The grounding rod is a long and thin conductor with good conductivity, and needs to be hammered into the ground during construction, in order to avoid the bending of the grounding rod in the hammering process, for example, a lightning protection grounding rod disclosed in the chinese patent with publication number CN208189802U, in fact, the lightning protection grounding device comprises a drill bit, a plurality of connectors, a plurality of copper rods (grounding rods) and impact-resistant bolts, wherein the connectors and the copper rods form a connecting unit, the connectors and the copper rods are alternately in threaded connection, the top copper rod is in threaded connection with the impact-resistant bolts, and the bottom copper rod is in threaded connection with the drill bit.
In the prior art, the manufacturing process of an electroplating method and an immersion plating method is usually adopted to produce the copper-clad steel grounding rod, and the manufacturing process of the electroplating method is adopted to produce the copper-clad steel grounding rod, so that the following problems exist: 1. because the finished material has the problem of residual electroplating solution, the environment is easily polluted; 2. the hardness of the grounding rod is difficult to improve; 3. because the electroplating process is adopted, only a thin copper layer (generally not more than 0.02 mm) is plated on the surface of the steel core, and the adhesion force of the copper layer on the surface of the steel core is poor, the copper layer adhered to the surface of the steel core is easy to fall off in the process that the grounding rod is hammered into the ground during the construction of the lightning protection grounding device.
The copper-clad steel grounding rod produced by adopting the dip-plating process has the following problems: 1. the production energy consumption is large, the surface copper layer is not uniform, and the production process must be continuous; 2. the bonding layer of copper and steel is easily alloyed, which results in a high brittleness of the intermediate layer of the whole material and is easily brittle.
Disclosure of Invention
In order to solve the technical problems, a first object of the present invention is to provide a method for manufacturing a copper-clad steel ground rod, which can make the bonding force between copper and steel materials stronger and the manufacturing process more environment-friendly; the second purpose of the invention is to provide a copper-clad steel grounding rod produced by the manufacturing method; the third purpose of the invention is to provide a lightning protection grounding device with the copper-clad steel grounding rod which is produced by the manufacturing method and has more ideal and reliable grounding effect.
In order to achieve the first object of the invention, the invention adopts the following technical scheme:
a manufacturing method of a copper-clad steel ground rod comprises the following steps:
① selecting a copper pipe and a steel bar, and respectively cleaning the inner surface of the copper pipe and the outer surface of the steel bar to remove oil stains on the inner surface of the copper pipe and oxide skin on the outer surface of the steel bar;
② sleeving the steel bar in the copper pipe to form a copper-clad steel blank;
③ high-frequency heating the copper-clad steel blank at the temperature of 500 ℃ and 950 ℃;
④ rolling and compressing the heated copper clad steel blank;
⑤ cutting the rolled and compressed copper-clad steel blank according to a set diameter;
⑥ quenching the cut copper clad steel blank;
⑦ processing external thread on the copper clad steel blank after quenching to obtain the copper clad steel grounding rod with effective combination thickness more than 0.5 um.
The copper-clad steel grounding rod is produced by adopting a hot rolling manufacturing process, the steel rod is sleeved into the copper pipe through a sleeve method, two metal materials of copper and steel are physically combined through rolling, the bonding force of the two metal materials of copper and steel is stronger, the copper layer is more uniformly distributed, a high-frequency heating mode is adopted to heat a copper-clad steel blank after the sleeve, the heating efficiency is higher, the copper-clad steel blank is more uniformly heated, and the temperature is controllable. Through quenching, the hardness of the copper clad steel blank can be improved, and the grounding rod is not easy to bend when entering the ground surface under hammering. The copper-clad steel grounding rod is not easy to brittle failure during construction, the manufacturing process is environment-friendly and pollution-free, and the material cost can be effectively saved.
In the above technical solution, preferably, in the step ③, the heating is performed in an inert gas atmosphere, in order to avoid an oxide film on the surface of the copper-clad steel billet during the heating process and increase unnecessary man-hours for manually or automatically processing the oxide film, it is preferable to select an inert gas to protect the copper-clad steel billet during the heating process.
In the foregoing technical solution, preferably, in the step ①, the copper tube has a thickness of 0.5 mm to 4mm, a diameter of 20 mm to 35 mm, and a length of 3 m to 5m, the length of the steel rod is adapted to the length of the copper tube, the diameter of the steel rod is smaller than the diameter of the copper tube, and a difference value between the diameter and the difference value is 2mm to 3 mm.
In the above technical solution, preferably, in the step ②, the copper-clad steel billet is subjected to drawing processing, and the drawing processing can be performed on the copper-clad steel billet by using a drawing machine, so that a gap between the copper tube and the steel rod is reduced as much as possible, the steel rod and the copper tube are combined more tightly, and the quality of the formed copper-clad steel billet is better.
In the above technical solution, preferably, in the step ④, the reduction of the copper clad steel billet is 30-60%, the rolling reduction of the copper clad steel billet can be selected to make the copper pipe and the steel bar combined more tightly, further preferably, the copper clad steel billet can be rolled and compressed by a rolling mill, the rolling mill is a two-roll pass rolling mill, the rolling passes are 2-4 passes, and normalization and unification of production are facilitated.
In order to achieve the second object of the invention, the invention adopts the following technical scheme:
the copper-clad steel grounding rod produced by the manufacturing method of the copper-clad steel grounding rod in any technical scheme comprises a steel core and a copper layer compounded on the outer side of the steel core, wherein external threads are arranged at two opposite end parts of the copper-clad steel grounding rod, and the thickness of an effective combining layer of the copper-clad steel grounding rod and the steel core is more than 0.5 um.
Compared with the copper-clad steel grounding rod produced by adopting a dip plating method or an electroplating method in the prior art, the copper-clad steel grounding rod produced by the manufacturing method has the advantages that the bonding force of two metal materials of copper and steel is stronger, the copper layer is more uniformly distributed, the problem of copper sheet falling does not exist, the hardness and the strength are more uniform, and the copper-clad steel grounding rod is not easy to brittle fracture during construction.
In the above technical solution, preferably, the thickness of the copper layer is greater than 0.254 mm. Further preferably, the outer surface of the copper-clad steel ground rod is compounded with an anticorrosive coating. Because the copper-clad steel grounding rod is arranged underground for a long time and is easy to corrode, an anti-corrosion layer is preferably compounded on the outer surface of the copper-clad steel grounding rod, the anti-corrosion layer can be a nano carbon conductive anti-corrosion layer, and the nano carbon conductive anti-corrosion layer can not only enhance the anti-corrosion effect of the copper-clad steel grounding rod, but also enhance the conductivity of the copper-clad steel grounding rod. Preferably, a plurality of conductive layers can be compounded on the outer surface of the copper-clad steel ground rod, and an anti-corrosion layer is compounded on the outermost side, wherein the conductive layers and/or the anti-corrosion layer are not limited to metal materials, and can also be obtained by compounding non-metal materials through various processes such as soaking, spraying, electroplating, cladding and the like.
In order to achieve the third object of the invention, the invention adopts the following technical scheme:
the lightning protection grounding device comprises a drill bit, a connecting unit and an impact-resistant bolt which are sequentially connected end to end, wherein the connecting unit comprises a plurality of copper-clad steel grounding rods and a plurality of connectors, the copper-clad steel grounding rods are in threaded connection with the connectors alternately, the drill bit is in threaded connection with the copper-clad steel grounding rods at the head ends, and the impact-resistant bolt is in threaded connection with the tail ends.
The copper-clad steel grounding rod produced by the manufacturing method can be assembled with a connector, a drill bit and an impact-resistant bolt known in the prior art for use to form a complete lightning protection grounding device, and the lightning protection grounding device with the copper-clad steel grounding rod has a better grounding effect.
Compared with the prior art, the invention has the following beneficial effects: the copper-clad steel grounding rod is produced by adopting a hot rolling manufacturing process, the steel rod is sleeved into the copper pipe through a sleeve method, two metal materials of copper and steel are physically combined through rolling, the two metal materials of copper and steel have stronger bonding force, the copper layer is more uniformly distributed, the Vickers hardness of the copper-clad steel grounding rod is more than 360, the grounding rod is not easy to be brittle-broken during construction, the manufacturing process is environment-friendly and pollution-free, and the material cost can be effectively saved.
Drawings
FIG. 1 is a flow chart of the process for manufacturing a ground bar according to the present invention;
FIG. 2 is a schematic structural view of the ground rod of the present invention;
FIG. 3 is a schematic structural diagram of the lightning protection grounding device of the present invention;
wherein: 100. a lightning protection grounding device;
10. a drill bit; 20. a connection unit; 201. copper clad steel ground rod; 202. a connector; 30. an impact-resistant bolt;
1. a steel core; 2. a copper layer; 3. an external thread; 4. and a nano carbon conductive anticorrosive layer.
Detailed Description
For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference will be made to the following detailed description of the embodiments in conjunction with the accompanying drawings.
As shown in fig. 1, the process flow of the hot rolling manufacturing process of the ground rod is as follows:
firstly, selecting a seamless copper tube with the thickness of 0.5-4 mm, the diameter of 20-35 mm and the length of 3-5m, and cleaning the inner surface of the seamless copper tube to remove oil stains and dirt on the inner surface of the seamless copper tube. Of course, the sizes of the copper pipe material and the copper pipe can be respectively selected according to the ground rods with different specifications to be manufactured, for example, materials such as silicon copper, phosphorus copper, common brass and the like, so that the specifications of production and manufacture are standardized.
And secondly, selecting a steel bar with the length matched with that of the seamless red copper pipe in the first step, wherein the steel bar is preferably made of medium carbon steel or high carbon steel and has higher hardness, the diameter of the steel bar is slightly smaller than that of the copper pipe, the difference value of the diameter of the steel bar and the diameter of the copper pipe is 2-3 mm, and removing oxide skin on the outer surface of the steel bar by using mechanical processes such as sand blasting and the like. Of course, the material and size of the steel bar can be selected according to the ground bars with different specifications to be manufactured, so that the specifications of production and manufacture are standardized.
And thirdly, before the steel bar is sleeved into the copper pipe, the outer surface of the steel bar is preferably polished, for example, the outer surface of the steel bar is polished by using a tool such as a wire brush, so that the steel bar is more conveniently sleeved into the copper pipe to form a copper-clad steel blank.
And fourthly, sleeving the steel bar into the copper pipe to form a copper-clad steel blank. Preferably, the copper-clad steel blank is subjected to drawing treatment. For example, a wire drawing machine is used for drawing the copper-clad steel billet, so that the gap between the copper pipe and the steel rod is reduced as much as possible, the steel rod and the copper pipe are combined more tightly, and the formed copper-clad steel billet has better quality.
Fifthly, heating the copper-clad steel blank by high frequency at the temperature of 500-950 ℃. The heating is preferably carried out in an inert gas atmosphere, the inert gas is used for protecting the copper-clad steel blank in heating, and the phenomenon that an oxide film is generated on the surface of the copper-clad steel blank in the heating process and the working time of unnecessary manual or automatic treatment of the oxide film is increased is avoided. The high-frequency heating mode known in the prior art is utilized to heat the copper-clad steel blank after the bushing, the heating efficiency is higher, the copper-clad steel blank is heated more uniformly, and the temperature is controllable.
And sixthly, rolling and compressing the heated copper-clad steel blank. The production standardization and unification are convenient, a two-roll pass rolling mill can be adopted to roll and compress the copper-clad steel blanks, the rolling pass is 2-4, and the compression amount of the copper-clad steel blanks is 30-60%. Of course, the rolling reduction of the copper clad steel can be selected to make the combination of the copper pipe and the steel bar more compact.
And seventhly, cutting the rolled and compressed copper-clad steel blank according to a set diameter. The set diameter is generally 1220-2500 mm. Of course, the cutoff diameter of the copper clad steel billet can be selected according to the actual production condition, so that the production is normalized and standardized.
And step eight, carrying out quenching treatment on the cut copper-clad steel blank to enhance the hardness of the copper-clad steel blank. For example, the cut copper clad steel billet is immersed in quenching oil for quenching.
And ninthly, processing external threads at two opposite ends of the quenched copper-clad steel blank to obtain the copper-clad steel grounding rod with the effective combination thickness larger than 0.5 um. Wherein the external thread of the copper clad steel ground rod is suitable for matching with components such as connectors and the like known in the prior art. For example, the machine tool and other mechanical equipment are used for turning external threads on two ends of the copper clad steel billet.
And step ten, soaking the obtained finished product copper-clad steel grounding rod in the nano-carbon conductive anticorrosive solution for 1-5min, taking out and drying, and finally forming a compact nano-carbon conductive anticorrosive layer on the outer surface of the copper-clad steel grounding rod to enhance the corrosion resistance and the conductivity of the copper-clad steel grounding rod.
In conclusion, the copper-clad steel grounding rod is produced by adopting a hot rolling manufacturing process, the steel rod is sleeved in the copper pipe through a sleeve method, two metal materials of copper and steel are physically combined through rolling, the bonding force of the two metal materials of copper and steel is stronger, the copper layer is more uniformly distributed, the grounding rod is not easy to break during construction, the hardness of the copper-clad steel grounding rod is higher through quenching, the copper-clad steel grounding rod is not easy to bend when the copper-clad steel grounding rod enters the ground under the action of hammering, the manufacturing process is environment-friendly and pollution-free, and the material cost can be effectively saved.
The structural composition of the copper clad steel ground rod produced by the hot rolling process shown in fig. 1 and the structural composition of the lightning protection grounding device with the copper clad steel ground rod will be described with reference to fig. 2-3.
As shown in fig. 2, the grounding rod 201 comprises a steel core 1 and a copper layer 2 compounded outside the steel core 1, wherein the two opposite ends of the grounding rod 201 are provided with external threads 3, and the effective combining layer thickness of the copper layer of the copper-clad steel grounding rod and the steel core is more than 0.5 um. The thickness of the copper layer is greater than 0.254 mm. The outer surface of the ground rod 201 is compounded with the nano carbon conductive anticorrosive coating 4, and the nano carbon conductive anticorrosive coating can not only enhance the corrosion resistance of the copper-clad steel ground rod, but also enhance the conductivity of the copper-clad steel ground rod. Certainly, a plurality of conducting layers can be compounded on the outer surface of the copper-clad steel ground rod, an anticorrosive layer is compounded on the outermost side, and the conducting layers and/or the anticorrosive layer are not limited to metal materials, but also can be non-metal materials and are compounded by using various processes such as soaking, spraying, electroplating, cladding and the like.
Compared with the copper-clad steel grounding rod produced by adopting a dip plating method or an electroplating method in the prior art, the copper-clad steel grounding rod produced by the manufacturing method has the advantages that the bonding force of two metal materials of copper and steel is stronger, the copper layer is more uniformly distributed, the problem of copper sheet falling does not exist, the hardness and the strength are more uniform, and the copper-clad steel grounding rod is not easy to brittle fracture during construction.
As shown in fig. 3, the lightning protection grounding device 100 includes a drill bit 10, a connection unit 20 and an impact-resistant bolt 30 sequentially connected end to end, the connection unit 20 includes a plurality of copper-clad steel grounding rods 201 and a plurality of connectors 202, the plurality of copper-clad steel grounding rods 201 and the plurality of connectors 202 are alternately in threaded connection, the drill bit 10 is in threaded connection with the copper-clad steel grounding rods 201 at the head end, and the impact-resistant bolt 30 is in threaded connection with the tail end connector 202.
The copper-clad steel grounding rod produced by the manufacturing method can be assembled with a connector, a drill bit and an impact-resistant bolt known in the prior art for use to form a complete lightning protection grounding device, and the lightning protection grounding device with the copper-clad steel grounding rod has a better grounding effect.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A manufacturing method of a copper-clad steel ground rod is characterized by comprising the following steps:
① selecting a copper pipe and a steel bar, and respectively cleaning the inner surface of the copper pipe and the outer surface of the steel bar to remove oil stains on the inner surface of the copper pipe and oxide skin on the outer surface of the steel bar;
② sleeving the steel bar in the copper pipe to form a copper-clad steel blank;
③ high-frequency heating the copper-clad steel blank at the temperature of 500 ℃ and 950 ℃;
④ rolling and compressing the heated copper clad steel blank;
⑤ cutting the rolled and compressed copper-clad steel blank according to a set diameter;
⑥ quenching the cut copper clad steel blank;
⑦ processing external thread on the copper clad steel blank after quenching to obtain the copper clad steel grounding rod with effective combination thickness more than 0.5 um.
2. The method as claimed in claim 1, wherein the heating step ③ is performed under an inert gas atmosphere.
3. The manufacturing method of the copper-clad steel ground rod according to claim 1, wherein in the step ①, the copper pipe has a thickness of 0.5-4 mm, a diameter of 20-35 mm and a length of 3-5m, the steel rod has a length corresponding to the length of the copper pipe, the steel rod has a diameter smaller than the diameter of the copper pipe and has a difference of 2-3 mm.
4. The method as claimed in claim 1, wherein in step ②, the copper-clad steel blank is drawn.
5. The method for manufacturing the copper-clad steel grounding rod as claimed in claim 1, wherein in the step ④, the reduction amount of the copper-clad steel billet is 30-60%, the copper-clad steel billet is rolled and compressed by a rolling mill, the rolling mill is a two-roll pass rolling mill, and the rolling pass is 2-4.
6. A copper-clad steel ground rod produced by the method for manufacturing the copper-clad steel ground rod according to any one of claims 1 to 5, comprising a steel core (1) and a copper layer (2) compounded outside the steel core (1), wherein the two opposite ends of the copper-clad steel ground rod are provided with external threads (3), and the method is characterized in that: the thickness of the effective combining layer of the copper-clad steel grounding rod and the steel core is more than 0.5 um.
7. The copper-clad steel ground rod of claim 6, wherein: the copper layer has a thickness greater than 0.254 mm.
8. A lightning protection grounding device with the copper-clad steel grounding rod of claim 6, characterized in that: including drill bit (10), linkage unit (20) and shock-resistant bolt (30) that end to end in proper order, linkage unit (20) include a plurality of copper clad steel earth bar (201) and a plurality of connector (202), a plurality of copper clad steel earth bar (201) and a plurality of connector (202) threaded connection in turn, drill bit (10) and head end copper clad steel earth bar (201) threaded connection, shock-resistant bolt (30) and tail end connector (202) threaded connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010309604.XA CN111416220A (en) | 2020-04-20 | 2020-04-20 | Copper-clad steel grounding rod, manufacturing method thereof and lightning protection grounding device |
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| CN202010309604.XA CN111416220A (en) | 2020-04-20 | 2020-04-20 | Copper-clad steel grounding rod, manufacturing method thereof and lightning protection grounding device |
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| CN201038347Y (en) * | 2007-04-16 | 2008-03-19 | 青岛辉安工程控制有限公司 | Antiseptic grounding apparatus |
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| CN203013950U (en) * | 2012-12-05 | 2013-06-19 | 新昌县人通电力技术有限公司 | Copper-clad steel grounding electrode |
| CN103996909A (en) * | 2014-05-21 | 2014-08-20 | 国网河南省电力公司漯河供电公司 | Anti-corrosion and anti-theft grounding electrode |
| CN106448932A (en) * | 2016-11-22 | 2017-02-22 | 湖南三泰新材料股份有限公司 | Method for preparing copper-clad steel composite material |
| CN206673132U (en) * | 2017-04-13 | 2017-11-24 | 浙江越固电力科技有限公司 | A kind of power ground rod |
| CN109290388A (en) * | 2018-09-27 | 2019-02-01 | 广德克莱德新材料技术有限公司 | A kind of continuous sandwich rolling production technology of copper clad steel conducting wire |
| CN109750245A (en) * | 2019-03-18 | 2019-05-14 | 张家港友谊金属复合材料有限公司 | A kind of preparation method of copper covered steel wire |
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2020
- 2020-04-20 CN CN202010309604.XA patent/CN111416220A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201038347Y (en) * | 2007-04-16 | 2008-03-19 | 青岛辉安工程控制有限公司 | Antiseptic grounding apparatus |
| CN102049664A (en) * | 2009-11-03 | 2011-05-11 | 北京有色金属研究总院 | Preparation method of copper-clad steel bimetal composite rod |
| CN203013950U (en) * | 2012-12-05 | 2013-06-19 | 新昌县人通电力技术有限公司 | Copper-clad steel grounding electrode |
| CN103996909A (en) * | 2014-05-21 | 2014-08-20 | 国网河南省电力公司漯河供电公司 | Anti-corrosion and anti-theft grounding electrode |
| CN106448932A (en) * | 2016-11-22 | 2017-02-22 | 湖南三泰新材料股份有限公司 | Method for preparing copper-clad steel composite material |
| CN206673132U (en) * | 2017-04-13 | 2017-11-24 | 浙江越固电力科技有限公司 | A kind of power ground rod |
| CN109290388A (en) * | 2018-09-27 | 2019-02-01 | 广德克莱德新材料技术有限公司 | A kind of continuous sandwich rolling production technology of copper clad steel conducting wire |
| CN109750245A (en) * | 2019-03-18 | 2019-05-14 | 张家港友谊金属复合材料有限公司 | A kind of preparation method of copper covered steel wire |
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Application publication date: 20200714 |