CN103531301A - Process for producing soft-state copper clad steel conductor by adopting welding cladding method - Google Patents
Process for producing soft-state copper clad steel conductor by adopting welding cladding method Download PDFInfo
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Abstract
The invention relates to a production process of a copper clad steel conductor and particularly provides a process for producing a soft-state copper clad steel conductor by adopting a welding cladding method. The process comprises the following steps: drawing, tempering at a low temperature, washing with acid, washing with water, neutralizing, drying, straightening and removing rust, cladding and welding, singly drawing, continuously drawing, tempering at a high temperature, drawing by a water tank, passivating, and carrying out online detection on the copper clad steel conductor by using a surface online flaw detection device, and carrying out take-up and winding. The process for producing the soft-state copper clad steel conductor by adopting the welding cladding method has the advantages of low production cost, safe and environment-friendly production process, and stable quality and high yield of the produced copper clad steel conductor.
Description
Technical field
The present invention relates to a kind of production technology of copper covered steel wire.
Background technology
Copper covered steel wire is to take steel wire as core body, covers in its surface the composite wire of layer of copper, is mainly used in communication and electron trade, is the regeneration product of communications cable proprietary material.This product has electric conductivity and the high frequency characteristics of the tensile strength of steel and toughness, copper, and has the copper material of saving, the advantage such as reduces costs.It has the advantage of copper and steel concurrently, and in certain high-frequency range, its resistance value equates with pure copper wire, but tensile strength can be several times of fine copper.In communication telecommunication, copper covered steel wire and copper cash have same conductivity, but because copper covered steel wire mechanical strength is good, quality is light, without creep, stands to obtain the attack of the snow ice bud that blows, stand large span, salt fog and perishable environment, so reduce distortion, the distortion of transmission information, improved transmission quality, reduced cost.
The difference of copper covered steel wire use occasion is divided into soft state copper covered steel wire and hard state copper covered steel wire, soft state copper covered steel wire is to require low for tension, elongation requires high occasion, and hard state copper covered steel wire is high for tensile strength requirement, and elongation is required to low occasion.The method of at present, producing soft state copper covered steel both at home and abroad mainly contains the coated method of welding, galvanoplastic, dip coating.It is high that the coated method of traditional welding has cost, occurs the shortcomings such as copper fault rupture and copper covered steel brittle failure phenomenon are serious in drawing process; It is high that galvanoplastic have energy consumption, and environmental pollution is serious, is not suitable for producing the shortcomings such as high conductivity product; It is large that dip coating has equipment investment, and the difficult control of crystallization, the inhomogeneous copper covered steel quality that causes of copper layer thickness are difficult to ensure the shortcomings such as card, production cost height.
Summary of the invention
The object of the invention is to overcome the problems such as the finished product rate existing in conventional softer state copper covered steel wire technique is low, production cost is high, environmental pollution is serious, a kind of production technology environmental protection is disclosed, production cost is low, the copper covered steel wire rate of finished products of producing is high, the technique that the coated method of employing welding of conductance and good percentage elongation is produced soft state copper covered steel wire.
In order to realize foregoing invention object, the present invention adopts following technical scheme:
A technique that adopts the coated method of welding to produce soft state copper covered steel wire, comprises the following steps: successively
(1) drawing, is pulled to wire diameter 8.0-8.6mm by the steel wire of wire diameter 9.0-10.0mm;
(2) lonneal, puts into vacuum tempering furnace by the steel wire after drawing and carries out Low Temperature Heat Treatment, temperature 420-500 ℃, heating time 1-2 hour, temperature retention time 5.5-6.5 hour; Then first power-off is with stove cooling 3 hours, then opens air-cooler and be cooled to 260 ℃ of left and right and come out of the stove; Eliminate the work hardening of steel wire, improve plasticity, be beneficial to following process; Make the lubricating fluid that remains in Steel Wire Surface in last process form loose scale through high temperature carbonization simultaneously, be easy to follow-up pickling scale removal;
(3) pickling, the oxide skin of removal Steel Wire Surface;
(4) washing, removes the hydrochloric acid that Steel Wire Surface is adhered to;
(5) neutralization, the acid of removing washing rear surface remnants, while preventing that steel wire from depositing, surface is corroded;
(6) dry up, remove the residual moisture of Steel Wire Surface, prevent that steel wire resting period length from easily causing getting rusty;
(7) align and eliminate rust, steel wire is taken turns to enter to be equipped with after aligning by aligning and several the brushing machine of wire brush is carried out to bristle rust cleaning;
(8) clad welded, first polishes again to the steel wire after rust cleaning, simultaneously by copper strips bristle, when thoroughly removing steel wire and copper strip surface greasy dirt and oxide-film, increases the roughness of steel wire and copper strip surface, improves the adhesion of steel wire and copper strips; Then copper strips and steel are sent in laminating case simultaneously, vertical forming wheel and horizontal form wheel in laminating case make copper strips be coated on uniformly Steel Wire Surface, in laminating case, by air inlet, pass into nitrogen, make two kinds of metal materials not oxidized in laminating process; Then enter weld zone, welding gun place, weld zone uses argon gas as protection gas, with pulsed tungsten argon arc welding, the weld seam of metal material is continuously welded, after welding, enter cooling zone, cooling zone passes into nitrogen as protection gas, the metal surface that prevents from welding rear high temperature is oxidized, is finally wrapped on reel; After being coated, copper covered steel wire warp is 10mm; In conventional bag overgrowth product, in laminating case and cooling zone all uses argon gas as protection gas, because consume 4 times that gas cost argon gas is nitrogen, therefore pass into different protective gas by segmentation, can effectively reduce production costs, and can not affect welding and coated quality; Simultaneously, though argon gas itself is nontoxic, but when high concentration, there is smothering action, in air, argon concentration just has the danger suffocating higher than 33% time, when argon concentration surpasses 50%, occurs serious symptoms, concentration reaches 75% when above, can be dead in several minutes, liquid argon can be hindered skin, and eye contact can cause inflammation; And nitrogen gas concn just there will be ill symptoms while surpassing 80%, when concentration surpasses 90%, just can cause and suffocate, therefore therefore pass into different protective gas by segmentation, can make to produce safety and environmental protection more;
(9) singly draw, copper covered steel recombination line after coated is sent into single machine drawing by pay off rack and directive wheel, after two groups of wire-drawing dies, it is 8mm that copper covered steel recombination line is pulled to wire diameter, singly be pulled through in journey, wire diameter compression ratio is 19-21%, and the wire drawing dish in the unwrapping wire position of pay off rack, directive wheel and single machine drawing is maintained at the same horizontal plane; In every group of wire-drawing die aperture, minute four intervals, are respectively lubricated district, service area, sizing area and outlet area, and lubricated district and service area are level and smooth arc transition, and sizing area and this tangential; Because of after being covered to complete, between steel wire and copper strips, there is certain space, copper covered steel is prone to bending and causes copper fault rupture in follow-up drawing, therefore unwrapping wire position, directive wheel, wire drawing dish are maintained at the same horizontal plane, copper covered steel keeps certain inlet wire radian before entering wire drawing machine, thereby prevents the copper fault rupture that copper covered steel causes because of inlet wire bending; In traditional be coated-drawing process, in single machine drawing, a wire-drawing die is only installed, is adopted and singly draw for twice, therefore, easily cause surface to be damaged, surface smoothness is difficult to guarantee simultaneously.In traditional wire-drawing die between lubricated district and service area, have certain angle between service area and sizing area, powdered lubricant in lubricated district is difficult to enter service area, and the corner that the wire drawing powder by sticking to copper covered steel wire surface behind lubricated district easily enters service area at copper covered steel wire comes off, thereby affect the lubrification on copper covered steel wire surface, cause it in service area and sizing area, to be easily pulled off.Wire-drawing die in the present invention is designed to level and smooth arc transition by lubricated district and service area, sizing area and this tangential, thus eliminate the turning between subregion, the wire drawing powder in district easy to lubricate enters service area;
(10) connect and draw, the copper covered steel after singly drawing is sent into connect and draw equipment to carry out drawing, draw continuously twice, wire diameter is pulled to 3.85-3.8mm for the first time, and wire diameter is pulled to 1.85-1.8mm for the second time; In each drawing process, the compression ratio of per pass mould is controlled at 20-26%, and requires the difference of adjacent twice compression ratio must not be higher than 10%, otherwise easy broken string in drawing process;
(11) high tempering, carries out high tempering by the copper covered steel wire after drawing, adopts nitrogen as protection gas, prevents copper covered steel surface oxidation, and temperature is heated to after 500-650 degree, and insulation 6-8 hour, eliminates work hardening by tempering, and softening wire rod;
(12) water tank wire drawing, is pulled to wire diameter 1.63-1.02mm with wire drawing machine by copper covered steel, and tensile strength is at 345MPa-550MPa, elongation 15%-20%; Wire drawing machine can reduce back skating coefficient, prevents surface tear, improves product surface fineness;
(13) passivation, the copper covered steel that drawing is completed carries out surface passivation, prevents Steel Wire Surface oxidation;
(14) with surperficial line flaw detection checkout gear, copper covered steel is detected online, copper pull-up being detected falls or scratches, after autostop, copper pull-up is fallen or scratches part to cutting, then use welding weldering, with file, polish weld again, joint is electroplated to complement plated in complement plated groove, after complement plated, continue carrying out flaw detection until by detecting;
(15) take-up sabot, obtains soft state copper covered steel wire finished product, and the conductance of copper covered steel wire finished product is 21-40%;
Above-mentioned surperficial line flaw detection checkout gear comprises installing rack, incoming wire guide wheel, inlet wire bar, outgoing line guide wheel, outlet rod, probe mounting rod, detection probe, the anti-interference protective sleeve of probe, controller and alarm; Installing rack consists of mount pad and mounting panel fixed thereon, inlet wire bar, outlet rod and probe mounting rod bottom are installed on mounting panel, incoming wire guide wheel is by Height Adjustable being movably arranged on mounting panel of inlet wire bar, outgoing line guide wheel is by Height Adjustable being movably arranged on mounting panel of outlet rod, detection probe is in the anti-interference protective sleeve of popping one's head in, and the anti-interference protective sleeve of popping one's head in is by Height Adjustable being movably arranged on mounting panel of probe mounting rod; Detection probe and the anti-interference protective sleeve of probe are provided with the concentric cable-through hole passing for copper covered steel wire, pop one's head in anti-interference protective sleeve and interior detection probe thereof between incoming wire guide wheel and outgoing line guide wheel, on the anti-interference protective sleeve of the top of incoming wire guide wheel, detection probe and probe, the top of cable-through hole and outgoing line guide wheel is on same level straight line, the detected probe of copper covered steel wire is in linear state all the time while detecting, and has guaranteed the accuracy detecting; Detection probe connects controller, connects alarm on controller; Detection probe, in the anti-interference protective sleeve of popping one's head in, has further improved the accuracy detecting.The height of incoming wire guide wheel, detection probe and outgoing line guide wheel can regulate, and uses adjustment very convenient.Further, detection probe is eddy current flaw detec; The end face of described mounting panel is horizontal plane, and parallel with the cable-through hole on the anti-interference protective sleeve of probe with detection probe; The anti-interference protective sleeve of described probe is insulation protective jacket; eddy current flaw detec is to utilize electric conducting material in alternating magnetic field, to produce the character of eddy current; detect the variable signal in electric conducting material stack magnetic field with exosyndrome material defect; being particluarly suitable for copper covered steel wire workshop uses; the anti-interference protective sleeve of popping one's head in is insulation protective jacket; especially coordinate eddy current flaw detec to use at the numerous copper covered steel wire workshop of metal, improved the accuracy detecting.
A kind of technique that adopts the coated method of welding to produce soft state copper covered steel wire that adopts technique scheme, its beneficial effect is as follows: compare and electroplate drawing process, technique is environmental protection more, and produces the copper covered steel wire of high conductivity, consumes energy lower, and production capacity is more increased; Compare dip-coating drawing process, investment of production equipment is little, and copper layer thickness is even, more stable quality; Compare traditional coated drawing process, technique is safety and environmental protection more, quality is more stable, rate of finished products is high, and conductance is high, can reach 21-40%, good percentage elongation, elongation reaches 15%-20%, and production cost is low and production process is safer, has guaranteed the golden rate of finished products of product by surperficial line flaw detection checkout gear; In sum, the advantage that the coated method of above-mentioned employing welding is produced the technique of soft state copper covered steel wire is that production cost is low, production process safety and environmental protection, and the copper covered steel wire steady quality rate of finished products of production is high.
Accompanying drawing explanation
Fig. 1: the structural representation of surperficial line flaw detection checkout gear in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing 1 and embodiment, the present invention is described further.
Embodiment
A technique that adopts the coated method of welding to produce soft state copper covered steel wire, is characterized in that comprising the following steps: successively
(1) drawing, is pulled to wire diameter 8.0-8.6mm by the steel wire of wire diameter 9.0-10.0mm;
(2) lonneal, puts into vacuum tempering furnace by the steel wire after drawing and carries out Low Temperature Heat Treatment, temperature 420-500 ℃, heating time 1-2 hour, temperature retention time 5.5-6.5 hour; Then first power-off is with stove cooling 3 hours, then opens air-cooler and be cooled to 260 ℃ of left and right and come out of the stove; Eliminate the work hardening of steel wire, improve plasticity, be beneficial to following process; Make the lubricating fluid that remains in Steel Wire Surface in last process form loose scale through high temperature carbonization simultaneously, be easy to follow-up pickling scale removal;
(3) pickling, the oxide skin of removal Steel Wire Surface;
(4) washing, removes the hydrochloric acid that Steel Wire Surface is adhered to;
(5) neutralization, the acid of removing washing rear surface remnants, while preventing that steel wire from depositing, surface is corroded;
(6) dry up, remove the residual moisture of Steel Wire Surface, prevent that steel wire resting period length from easily causing getting rusty;
(7) align and eliminate rust, steel wire is taken turns to enter to be equipped with after aligning by aligning and several the brushing machine of wire brush is carried out to bristle rust cleaning;
(8) clad welded, first polishes again to the steel wire after rust cleaning, simultaneously by copper strips bristle, when thoroughly removing steel wire and copper strip surface greasy dirt and oxide-film, increases the roughness of steel wire and copper strip surface, improves the adhesion of steel wire and copper strips; Then copper strips and steel are sent in laminating case simultaneously, vertical forming wheel and horizontal form wheel that multipair pass in laminating case gradually changes make copper strips be coated on uniformly Steel Wire Surface, in laminating case, by air inlet, pass into nitrogen, guarantee that two kinds of metal materials are not oxidized in laminating process; Then enter weld zone, welding gun place, weld zone uses argon gas as protection gas, with pulsed tungsten argon arc welding, the weld seam of metal material is continuously welded, after welding, enter cooling zone, cooling zone passes into nitrogen as protection gas, the metal surface that prevents from welding rear high temperature is oxidized, is finally wrapped on reel; After being coated, copper covered steel wire warp is 10mm; In conventional bag overgrowth product, in laminating case and cooling zone all uses argon gas as protection gas, because consume 4 times that gas cost argon gas is nitrogen, therefore pass into different protective gas by segmentation, can effectively reduce production costs, and can not affect welding and coated quality; Simultaneously, though argon gas itself is nontoxic, but when high concentration, there is smothering action, in air, argon concentration just has the danger suffocating higher than 33% time, when argon concentration surpasses 50%, occurs serious symptoms, concentration reaches 75% when above, can be dead in several minutes, liquid argon can be hindered skin, and eye contact can cause inflammation; And nitrogen gas concn just there will be ill symptoms while surpassing 80%, when concentration surpasses 90%, just can cause and suffocate, therefore therefore pass into different protective gas by segmentation, can make to produce safety and environmental protection more;
(9) singly draw, copper covered steel recombination line after coated is sent into single machine drawing by pay off rack and directive wheel, after two groups of wire-drawing dies, it is 8mm that copper covered steel recombination line is pulled to wire diameter, singly be pulled through in journey, wire diameter compression ratio is 19-21%, and the wire drawing dish in the unwrapping wire position of pay off rack, directive wheel and single machine drawing is maintained at the same horizontal plane; In every group of wire-drawing die aperture, minute four intervals, are respectively lubricated district, service area, sizing area and outlet area, and lubricated district and service area are level and smooth arc transition, and sizing area and this tangential; Because of after being covered to complete, between steel wire and copper strips, there is certain space, copper covered steel is prone to bending and causes copper fault rupture in follow-up drawing, therefore unwrapping wire position, directive wheel, wire drawing dish are maintained at the same horizontal plane, copper covered steel keeps certain inlet wire radian before entering wire drawing machine, thereby prevents the copper fault rupture that copper covered steel causes because of inlet wire bending; In traditional be coated-drawing process, in single machine drawing, a wire-drawing die is only installed, is adopted and singly draw for twice, therefore, easily cause surface to be damaged, surface smoothness is difficult to guarantee simultaneously.In traditional wire-drawing die between lubricated district and service area, have certain angle between service area and sizing area, powdered lubricant in lubricated district is difficult to enter service area, and the corner that the wire drawing powder by sticking to copper covered steel wire surface behind lubricated district easily enters service area at copper covered steel wire comes off, thereby affect the lubrification on copper covered steel wire surface, cause it in service area and sizing area, to be easily pulled off.Wire-drawing die in the present invention is designed to level and smooth arc transition by lubricated district and service area, sizing area and this tangential, thus eliminate the turning between subregion, the wire drawing powder in district easy to lubricate enters service area;
(10) connect and draw, the copper covered steel after singly drawing is sent into connect and draw equipment to carry out drawing, draw continuously twice, wire diameter is pulled to 3.85-3.8mm for the first time, and wire diameter is pulled to 1.85-1.8mm for the second time; In each drawing process, the compression ratio of per pass mould is controlled at 20-26%, and requires the difference of adjacent twice compression ratio must not be higher than 10%, otherwise easy broken string in drawing process;
(11) high tempering, carries out high tempering by the copper covered steel wire after drawing, adopts nitrogen as protection gas, prevents copper covered steel surface oxidation, and temperature is heated to after 500-650 degree, and insulation 6-8 hour, eliminates work hardening by tempering, and softening wire rod;
(12) water tank wire drawing, is pulled to wire diameter 1.63-1.02mm with a row formula water tank drawbench by copper covered steel, and tensile strength is at 345MPa-550MPa, elongation 15%-20%; Adopt a row formula wire drawing machine can reduce back skating coefficient, prevent surface tear, improve product surface fineness;
(13) passivation, the copper covered steel that drawing is completed carries out surface passivation, prevents Steel Wire Surface oxidation;
(14) with surperficial line flaw detection checkout gear, copper covered steel is detected online, if copper pull-up being detected falls or scratches, after autostop, copper pull-up is fallen or scratches part to cutting, then use welding weldering, with file, polish weld again, joint is electroplated to complement plated in complement plated groove, after complement plated, continue carrying out flaw detection until by detecting;
(15) take-up sabot, obtains soft state copper covered steel wire finished product, and the conductance of copper covered steel wire finished product is 21-40%.
As shown in Figure 1; above-mentioned surperficial line flaw detection checkout gear mainly consists of installing rack 1, incoming wire guide wheel 2, inlet wire bar 21, outgoing line guide wheel 3, outlet rod 31, probe mounting rod 4, detection probe 6, pop one's head in anti-interference protective sleeve 5, controller 7 and alarm, and installing rack 1 consists of mount pad 12 and mounting panel 11 fixed thereon.
Claims (2)
1. a technique that adopts the coated method of welding to produce soft state copper covered steel wire, is characterized in that comprising the following steps: successively
(1) drawing, is pulled to wire diameter 8.0-8.6mm by the steel wire of wire diameter 9.0-10.0mm;
(2) lonneal, puts into vacuum tempering furnace by the steel wire after drawing and carries out Low Temperature Heat Treatment, temperature 420-500 ℃, heating time 1-2 hour, temperature retention time 5.5-6.5 hour; Then first power-off is with stove cooling 3 hours, then opens air-cooler and be cooled to 260 ℃ of left and right and come out of the stove;
(3) pickling, the oxide skin of removal Steel Wire Surface;
(4) washing, removes the hydrochloric acid that Steel Wire Surface is adhered to;
(5) neutralization, the acid of removing washing rear surface remnants;
(6) dry up, remove the residual moisture of Steel Wire Surface;
(7) align and eliminate rust, steel wire is taken turns to enter to be equipped with after aligning by aligning and several the brushing machine of wire brush is carried out to bristle rust cleaning;
(8) clad welded, first polishes to the steel wire after rust cleaning, again simultaneously by copper strips bristle; Then copper strips and steel are sent in laminating case simultaneously, vertical forming wheel and horizontal form wheel in laminating case make copper strips be coated on uniformly Steel Wire Surface, in laminating case, by air inlet, pass into nitrogen, make two kinds of metal materials not oxidized in laminating process; Then enter weld zone, welding gun place, weld zone, continuously welds the weld seam of metal material with pulsed tungsten argon arc welding as protection gas with argon gas, enters cooling zone after welding, and cooling zone passes into nitrogen as protection gas; After being coated, copper covered steel wire warp is 10mm;
(9) singly draw, copper covered steel recombination line after coated is sent into single machine drawing by pay off rack and directive wheel, after two groups of wire-drawing dies, it is 8mm that copper covered steel recombination line is pulled to wire diameter, singly be pulled through in journey, wire diameter compression ratio is 19-21%, and the wire drawing dish in the unwrapping wire position of pay off rack, directive wheel and single machine drawing is maintained at the same horizontal plane; In every group of wire-drawing die aperture, minute four intervals, are respectively lubricated district, service area, sizing area and outlet area, and lubricated district and service area are level and smooth arc transition, and sizing area and this tangential;
(10) connect and draw, the copper covered steel after singly drawing is sent into connect and draw equipment to carry out drawing, draw continuously twice, wire diameter is pulled to 3.85-3.8mm for the first time, and wire diameter is pulled to 1.85-1.8mm for the second time; In each drawing process, the compression ratio of per pass mould is controlled at 20-26%, and requires the difference of adjacent twice compression ratio must not be higher than 10%;
(11) high tempering, carries out high tempering by the copper covered steel wire after drawing, adopts nitrogen as protection gas, and temperature is heated to after 500-650 degree, insulation 6-8 hour;
(12) water tank wire drawing, is pulled to wire diameter 1.63-1.02mm with wire drawing machine by copper covered steel, and tensile strength is at 345MPa-550MPa, elongation 15%-20%;
(13) passivation, the copper covered steel that drawing is completed carries out surface passivation;
(14) with surperficial line flaw detection checkout gear, copper covered steel is detected online, copper pull-up being detected falls or scratches, after autostop, copper pull-up is fallen or scratches part to cutting, then use welding weldering, with file, polish weld again, joint is electroplated to complement plated in complement plated groove, after complement plated, continue carrying out flaw detection until by detecting;
(15) take-up sabot, obtains soft state copper covered steel wire finished product, and the conductance of copper covered steel wire finished product is 21-40%;
Above-mentioned surperficial line flaw detection checkout gear comprises installing rack, incoming wire guide wheel, inlet wire bar, outgoing line guide wheel, outlet rod, probe mounting rod, detection probe, the anti-interference protective sleeve of probe, controller and alarm; Installing rack consists of mount pad and mounting panel fixed thereon, inlet wire bar, outlet rod and probe mounting rod bottom are installed on mounting panel, incoming wire guide wheel is by Height Adjustable being movably arranged on mounting panel of inlet wire bar, outgoing line guide wheel is by Height Adjustable being movably arranged on mounting panel of outlet rod, detection probe is in the anti-interference protective sleeve of popping one's head in, and the anti-interference protective sleeve of popping one's head in is by Height Adjustable being movably arranged on mounting panel of probe mounting rod; Detection probe and the anti-interference protective sleeve of probe are provided with the concentric cable-through hole passing for copper covered steel wire, pop one's head in anti-interference protective sleeve and interior detection probe thereof between incoming wire guide wheel and outgoing line guide wheel, and on the anti-interference protective sleeve of the top of incoming wire guide wheel, detection probe and probe, the top of cable-through hole and outgoing line guide wheel is on same level straight line; Detection probe connects controller, connects alarm on controller.
2. a kind of technique that adopts the coated method of welding to produce soft state copper covered steel wire according to claim 1, is characterized in that detection probe is eddy current flaw detec; The end face of described mounting panel is horizontal plane, and parallel with the cable-through hole on the anti-interference protective sleeve of probe with detection probe; The anti-interference protective sleeve of described probe is insulation protective jacket.
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| CN111564261A (en) * | 2020-05-25 | 2020-08-21 | 谈荣赋 | Copper clad steel strand manufacturing system |
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| CN111564261B (en) * | 2020-05-25 | 2021-12-10 | 江苏北高电气科技有限公司 | Copper clad steel strand manufacturing system |
| CN115312267A (en) * | 2022-06-22 | 2022-11-08 | 桐乡市永成线缆有限公司 | Production process of coated copper-clad steel |
| CN115312267B (en) * | 2022-06-22 | 2024-03-26 | 桐乡市永成线缆有限公司 | Coated copper-clad steel production process |
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