CN102284546A - Method and special die for manufacturing composite pipeline - Google Patents
Method and special die for manufacturing composite pipeline Download PDFInfo
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- CN102284546A CN102284546A CN201110168508A CN201110168508A CN102284546A CN 102284546 A CN102284546 A CN 102284546A CN 201110168508 A CN201110168508 A CN 201110168508A CN 201110168508 A CN201110168508 A CN 201110168508A CN 102284546 A CN102284546 A CN 102284546A
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- copper pipe
- carbon steel
- copper
- pipeline
- steel tubing
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Abstract
The invention discloses a method and a special die for manufacturing a composite pipeline. In the method for manufacturing the composite pipeline, axial cold extrusion is performed along the inner wall of a copper pipe by a cold-drawing machine and the special die to ensure that the copper pipe reaches a critical temperature and is subjected to plastic deformation, so that the copper pipe is tightly attached to a carbon steel pipe. The special die for manufacturing the composite pipeline comprises a die body made of a nylon 1010 material, wherein the die body is provided with a connecting hole connected with a core rod of the cold-drawing machine; and the front end face of the die body is provided with a transition fillet. After the copper pipe is compounded with the carbon steel pipe, the advantages of the copper pipe are kept, the defects that the copper pipe is expensive, easy to dent and deform, and the like are overcome, and the bending strength and impact resistance of the composite pipeline are greatly improved; in addition, the adopted cold extrusion composite technology is low in equipment requirement, operation difficulty and energy consumption, high in speed, quality and efficiency, concise and practical, and suitable for large-scale industrial production.
Description
Technical field
The present invention relates to the tubing field, be specifically related to a kind of preparation method and particular manufacturing craft thereof of compound pipeline complex pipeline.
Background technology
One to the fluid-transporting tubing that is called as " industrial blood vessels ", and it is used and almost relates to the every aspect of producing and living, so various countries all attach great importance to its production and development.With the steel pipe is example, each main advanced industrial country, and its proportion of production accounts for the 15%-20% of steel total amount, and China only accounts for 8-10% at present.
Conventional pipelines, substantially all belong to single material, performance is more single, anticorrosion not withstand voltage, withstand voltage not anticorrosion, anticorrosion not anti-aging again, always have defective, for example: 1, fine copper pipeline has superior corrosion resistant, wear-resisting, sterilization and keeps function such as fluid cleaning, but the fine copper pipeline costs an arm and a leg, and since the plasticity of himself, the crooked easily and distortion of pipeline, and its impact resistant capability is relatively poor, with the variation of service time and environment for use, leak easily, accident such as burn into explosion; 2, coating steel pipe, though cheap, in air, very easily be corroded, not only service life low, and cause the secondary pollution of fluid easily, influence human body health; 3, plastic conduits such as PE, PEX, PVC have advantages such as light and handy, easy to connect, but it is aging easily, and service life is low, and not anti-external force punching press, and especially the lead as plastic heat stabilizer very easily causes heavy metal pollution by fluid to human body in the pipeline.
Because copper ion can be killed germs such as the Escherichia coli that are easy to grow and dysentery in water, the disease portable objects such as larvae of removing mollusk such as the slug of water transmission snail fever and oncomelania and propagating malaria; Simultaneously, because copper and copper alloy, in non-oxidizing acids such as the aqueous solution, hydrochloric acid, organic acid, various alkali and non-oxidizing organic compound except that ammonia, good corrosion resistance is arranged all; It not only is widely used in petrochemical industry, all is widely used in desalinization, offshore oil production gas production platform, seashore and submarine facility.Copper tube is to outshine othersOne branch of the tree is particularly thriving in ocean development, and not only seawater corrosion resistance, and the copper ion that dissolves in the water has bactericidal action, can prevent marine biofouling.The advantage of copper tube is numerous, but because pure copper tube costs an arm and a leg and external force resistance intensity is low, a kind of relative low price, external force resistance intensity is good and have concurrently fine copper pipeline advantage pipeline exploitation and universal be a difficult problem to be captured.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of relative low price is provided, external force resistance intensity is good and has the preparation method and the particular manufacturing craft of the compound pipeline complex pipeline of fine copper pipeline advantage concurrently.
To achieve these goals, the technical solution used in the present invention is:
The preparation method of described compound pipeline complex pipeline, described compound pipeline complex pipeline are followed successively by copper or copper alloy layer and carbon steel layer from the inside to the outside, and the preparation method of compound pipeline complex pipeline may further comprise the steps:
A: choose copper or copper alloy tube and carbon steel tubing, according to carbon steel and copper alloy tube plastic deformation coefficient, the copper pipe external diameter is put into carbon steel tubing with copper pipe then than the little 4-8MM of carbon steel tubing internal diameter, and copper pipe one end need stretch out carbon steel tubing 100-150MM;
B: an end that uses pipe-expanding machine that copper pipe is stretched out carries out the enlarging operation, and external diameter is than the big 3-8MM of carbon steel tubing external diameter after the copper pipe enlarging, and copper pipe enlarging length is 20-50MM, and copper pipe enlarging place outer surface and carbon steel mouth of pipe edge joint weld connect;
C: use the cold-drawn complex technique that copper pipe and carbon steel tubing is compound, use particular manufacturing craft, mould is loaded on the drawbench, and the mould maximum outside diameter is than the big 2-5MM of carbon steel internal diameter;
Clamp carbon steel tubing, start drawbench,, start drawbench, do rectilinear motion along the copper pipe inwall by plug traction mould with the inside of mould from an end jacking copper pipe of copper pipe enlarging; The hauling speed of control drawbench is 4-9M/Min, and mould is when the other end of copper pipe passes, and by the squeezing action of mould, copper pipe and carbon steel tubing are compound to be finished, and stops drawbench work immediately;
Unlikely destruction copper pipe top layer cuprous oxide diaphragm need use cooling-lubricant in mold work when mould heads in the process of copper pipe inside axially extruding, and guarantees that cooling-lubricant uninterruptedly and can be evenly distributed on the copper pipe inner surface;
D: unload the compound pipeline complex pipeline of moulding, reconditioning compound pipeline complex pipeline two ends, scale is with the dried compound pipeline complex pipeline inwall of wind, air compressor machine V-0.17/Min, pressure 0.8Mpa.
The pipe-expanding machine that uses among the described step B is ￠ 300 hydraulic pressure pipe-expanding machines.
Use the LB-11 drawbench among the described step C, installed power is 11KW.
Among the described step C, use hydraulic pump and recirculation system thereof to guarantee that cooling-lubricant is uninterrupted and can be evenly distributed on the copper pipe inner surface hydraulic pump pressure 3MPA; Described cooling-lubricant is made of chlorinated paraffin wax and rosin, and its percentage by weight is: chlorinated paraffin wax 48-60%, rosin 40-52%.
The particular manufacturing craft of the preparation method of described compound pipeline complex pipeline comprises the die ontology of being made by nylon king 1010 materials, is provided with the connecting hole that is connected with the plug of drawbench on described die ontology, is provided with knuckle on the die ontology front end face.
The length of described die ontology is 1.2～1.5 times of carbon steel tubing internal diameter.
The external diameter of described die ontology is 1.05～1.1 times of copper pipe external diameter.
The aperture of described connecting hole is 0.1～0.25 times of external diameter of described die ontology.
The invention has the advantages that: the preparation method of described compound pipeline complex pipeline and particular manufacturing craft by being suitable for drawbench and particular manufacturing craft along the axial cold extrusion of copper pipe inwall, make copper pipe reach critical-temperature moulding distortion take place, thereby fit tightly with carbon steel tubing; After copper pipe and carbon steel tubing are compound, both kept all advantages that copper pipe had, and overcome pure copper tube again and existingly cost an arm and a leg, easily bump defectives such as flat and yielding, the bending strength and the shock resistance of compound pipeline complex pipeline increase substantially; In addition, the cold extrusion complex technique of employing of the present invention, equipment is less demanding, and operation easier is little, and energy consumption is low, and speed is fast, and is simple and clear practical, high-quality and efficient, is suitable for large-scale industrial production.
Description of drawings
Below the content of each width of cloth accompanying drawing expression of specification of the present invention and the mark among the figure are briefly explained:
Fig. 1 is the work schematic diagram of the preparation method of compound pipeline complex pipeline;
Mark among the above-mentioned figure is:
1, copper or copper alloy layer, 2, the carbon steel layer, 3, particular manufacturing craft.
The specific embodiment
Contrast accompanying drawing below, the description by to optimum embodiment is described in further detail the specific embodiment of the present invention.
Embodiment 1
The preparation method of described compound pipeline complex pipeline, as shown in Figure 1, described compound pipeline complex pipeline is followed successively by copper or copper alloy layer 1 and carbon steel layer 2 from the inside to the outside, and the preparation method of compound pipeline complex pipeline may further comprise the steps:
A: choose copper or copper alloy tube and carbon steel tubing, according to carbon steel and copper alloy tube plastic deformation coefficient, the copper pipe external diameter is put into carbon steel tubing with copper pipe then than the little 4MM of carbon steel tubing internal diameter, and copper pipe one end need stretch out carbon steel tubing 100MM;
B: an end that uses pipe-expanding machine that copper pipe is stretched out carries out the enlarging operation, and external diameter is than the big 8MM of carbon steel tubing external diameter after the copper pipe enlarging, and copper pipe enlarging length is 50MM, and copper pipe enlarging place outer surface and carbon steel mouth of pipe edge joint weld connect;
C: use the cold-drawn complex technique that copper pipe and carbon steel tubing is compound, use particular manufacturing craft, mould is loaded on the drawbench, and the mould maximum outside diameter is than the big 2MM of carbon steel internal diameter;
Clamp carbon steel tubing, start drawbench,, start drawbench, do rectilinear motion along the copper pipe inwall by plug traction mould with the inside of mould from an end jacking copper pipe of copper pipe enlarging; The hauling speed of control drawbench is 4M/Min, and mould is when the other end of copper pipe passes, and by the squeezing action of mould, copper pipe and carbon steel tubing are compound to be finished, and stops drawbench work immediately;
Unlikely destruction copper pipe top layer cuprous oxide diaphragm need use cooling-lubricant in mold work when mould heads in the process of copper pipe inside axially extruding, and guarantees that cooling-lubricant uninterruptedly and can be evenly distributed on the copper pipe inner surface;
D: unload the compound pipeline complex pipeline of moulding, reconditioning compound pipeline complex pipeline two ends, scale is with the dried compound pipeline complex pipeline inwall of wind, air compressor machine V-0.17/Min, pressure 0.8Mpa.
Among the described step C, described cooling-lubricant is made of chlorinated paraffin wax and rosin, and its percentage by weight is: chlorinated paraffin wax 48%, rosin 52%.
Embodiment 2
The preparation method of described compound pipeline complex pipeline, described compound pipeline complex pipeline are followed successively by copper or copper alloy layer and carbon steel layer from the inside to the outside, and the preparation method of compound pipeline complex pipeline may further comprise the steps:
A: choose copper or copper alloy tube and carbon steel tubing, according to carbon steel and copper alloy tube plastic deformation coefficient, the copper pipe external diameter is put into carbon steel tubing with copper pipe then than the little 8MM of carbon steel tubing internal diameter, and copper pipe one end need stretch out carbon steel tubing 150MM;
B: an end that uses pipe-expanding machine that copper pipe is stretched out carries out the enlarging operation, and external diameter is than the big 3MM of carbon steel tubing external diameter after the copper pipe enlarging, and copper pipe enlarging length is 20MM, and copper pipe enlarging place outer surface and carbon steel mouth of pipe edge joint weld connect;
C: use the cold-drawn complex technique that copper pipe and carbon steel tubing is compound, use particular manufacturing craft, mould is loaded on the drawbench, and the mould maximum outside diameter is than the big 5MM of carbon steel internal diameter;
Clamp carbon steel tubing, start drawbench,, start drawbench, do rectilinear motion along the copper pipe inwall by plug traction mould with the inside of mould from an end jacking copper pipe of copper pipe enlarging; The hauling speed of control drawbench is 9M/Min, and mould is when the other end of copper pipe passes, and by the squeezing action of mould, copper pipe and carbon steel tubing are compound to be finished, and stops drawbench work immediately;
Unlikely destruction copper pipe top layer cuprous oxide diaphragm need use cooling-lubricant in mold work when mould heads in the process of copper pipe inside axially extruding, and guarantees that cooling-lubricant uninterruptedly and can be evenly distributed on the copper pipe inner surface;
D: unload the compound pipeline complex pipeline of moulding, reconditioning compound pipeline complex pipeline two ends, scale is with the dried compound pipeline complex pipeline inwall of wind, air compressor machine V-0.17/Min, pressure 0.8Mpa.
Among the described step C, described cooling-lubricant is made of chlorinated paraffin wax and rosin, and its percentage by weight is: chlorinated paraffin wax 60%, rosin 40%.
Embodiment 3
The preparation method of described compound pipeline complex pipeline, described compound pipeline complex pipeline are followed successively by copper or copper alloy layer and carbon steel layer from the inside to the outside, and the preparation method of compound pipeline complex pipeline may further comprise the steps:
A: choose copper or copper alloy tube and carbon steel tubing, according to carbon steel and copper alloy tube plastic deformation coefficient, the copper pipe external diameter is put into carbon steel tubing with copper pipe then than the little 5MM of carbon steel tubing internal diameter, and copper pipe one end need stretch out carbon steel tubing 120MM;
B: an end that uses pipe-expanding machine that copper pipe is stretched out carries out the enlarging operation, and external diameter is than the big 6MM of carbon steel tubing external diameter after the copper pipe enlarging, and copper pipe enlarging length is 30MM, and copper pipe enlarging place outer surface and carbon steel mouth of pipe edge joint weld connect;
C: use the cold-drawn complex technique that copper pipe and carbon steel tubing is compound, use particular manufacturing craft, mould is loaded on the drawbench, and the mould maximum outside diameter is than the big 3MM of carbon steel internal diameter;
Clamp carbon steel tubing, start drawbench,, start drawbench, do rectilinear motion along the copper pipe inwall by plug traction mould with the inside of mould from an end jacking copper pipe of copper pipe enlarging; The hauling speed of control drawbench is 6M/Min, and mould is when the other end of copper pipe passes, and by the squeezing action of mould, copper pipe and carbon steel tubing are compound to be finished, and stops drawbench work immediately;
Unlikely destruction copper pipe top layer cuprous oxide diaphragm need use cooling-lubricant in mold work when mould heads in the process of copper pipe inside axially extruding, and guarantees that cooling-lubricant uninterruptedly and can be evenly distributed on the copper pipe inner surface;
D: unload the compound pipeline complex pipeline of moulding, reconditioning compound pipeline complex pipeline two ends, scale is with the dried compound pipeline complex pipeline inwall of wind, air compressor machine V-0.17/Min, pressure 0.8Mpa.
Among the described step C, described cooling-lubricant is made of chlorinated paraffin wax and rosin, and its percentage by weight is: chlorinated paraffin wax 58%, rosin 42%.
Use LB-11 drawbench, installed power: 11KW among the described step C.
Among the described step C, use hydraulic pump and recirculation system thereof to guarantee that cooling-lubricant is uninterrupted and can be evenly distributed on the copper pipe inner surface hydraulic pump pressure 3MPA; Described cooling-lubricant is made of chlorinated paraffin wax and rosin, and its percentage by weight is: chlorinated paraffin wax 48-60%, rosin 40-52%.The cooling-lubricant that the present invention adopts has passed through to be studied repeatedly and tests, and it can guarantee that compound pipeline complex pipeline inwall copper pipe surface is excellent, has kept original anti-corrosion, the wear-resisting and self-disinfection cleaning function of copper pipe effectively.
By being suitable for drawbench and particular manufacturing craft 3, make copper pipe reach critical-temperature moulding distortion takes place, thereby fit tightly with carbon steel tubing along the axial cold extrusion of copper pipe inwall.The advantage of cold-drawn complex technique is: bond strength, compactness and ratio of briquetting all reach optimization, and energy consumption is low, and speed is fast, and equipment is simple, and cost is low, and the performance of product is more stable.After copper pipe and carbon steel tubing are compound, both possessed the copper pipe advantage, and had the good advantage of carbon steel tubing external force resistance intensity again concurrently, compound pipeline complex pipeline is fewer owing to the copper pipe materials simultaneously, relative low price.
The particular manufacturing craft 3 of the preparation method of described compound pipeline complex pipeline comprises the die ontology of being made by nylon king 1010 materials, is provided with the connecting hole that is connected with the plug of drawbench on described die ontology, is provided with knuckle on the die ontology front end face.On the die ontology front end face, be provided with knuckle, be convenient in die ontology dress and the copper pipe inwall the big or small visual concrete condition adjustment of knuckle.
The length of described die ontology is 1.2～1.5 times of carbon steel tubing internal diameter.
The external diameter of described die ontology is 1.05～1.1 times of copper pipe external diameter.
The aperture of described connecting hole is 0.1～0.25 times of external diameter of described die ontology.
Because carbon steel tubing internal diameter flatness is accurate inadequately, the inwall ovality is relatively poor, and inner wall of welded pipe also has an inside weld projection, when selecting metal dies such as wolfram steel for use, result of the test is undesirable, and is not only compound not tight between copper pipe and the carbon steel tubing, has infelicity, and break plug easily, cause production accident.Through development test repeatedly, the professional mould of selecting for use nylon king 1010 materials to make at last, this material had both had enough hardness and wearability, also has certain elasticity, by extrusion expansion, each point that can make copper pipe very closely, seamlessly be compounded in the carbon steel tubing inwall is gone up and never bounce-back.
The main specifications technical parameter of the compound pipeline complex pipeline that the present invention makes is as follows:
(1) main specifications
(2) basic mechanical design feature
Operating temperature and pressure :-273 ℃-500 ℃, pressure-bearing: under the normal temperature 〉=2.0MPa.
Above the present invention has been carried out exemplary description; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (6)
1. the preparation method of a compound pipeline complex pipeline, it is characterized in that: described compound pipeline complex pipeline is followed successively by copper or copper alloy layer and carbon steel layer from the inside to the outside, and the preparation method of described compound pipeline complex pipeline may further comprise the steps:
A: choose copper or copper alloy tube and carbon steel tubing, according to carbon steel and copper or copper alloy tube plastic deformation coefficient, the copper pipe external diameter is put into carbon steel tubing with copper pipe then than the little 4-8MM of carbon steel tubing internal diameter, and copper pipe one end need stretch out carbon steel tubing 100-150MM;
B: an end that uses pipe-expanding machine that copper pipe is stretched out carries out the enlarging operation, and external diameter is than the big 3-8MM of carbon steel tubing external diameter after the copper pipe enlarging, and copper pipe enlarging length is 20-50MM, and copper pipe enlarging place outer surface and carbon steel mouth of pipe edge joint weld connect;
C: use the cold-drawn complex technique that copper pipe and carbon steel tubing is compound, use particular manufacturing craft, mould is loaded on the drawbench, and the mould maximum outside diameter is than the big 2-5MM of carbon steel internal diameter;
Clamp carbon steel tubing, start drawbench,, start drawbench, do rectilinear motion along the copper pipe inwall by plug traction mould with the inside of mould from an end jacking copper pipe of copper pipe enlarging; The hauling speed of control drawbench is 4-9M/Min, and mould is when the other end of copper pipe passes, and by the squeezing action of mould, copper pipe and carbon steel tubing reach the critical strain temperature and finish compoundly, stop drawbench work immediately;
Unlikely destruction copper pipe top layer cuprous oxide diaphragm need use cooling-lubricant in mold work when mould heads in the process of copper pipe inside axially extruding, and guarantees that cooling-lubricant uninterruptedly and be evenly distributed on the copper pipe inner surface;
D: unload the compound pipeline complex pipeline of moulding, reconditioning compound pipeline complex pipeline two ends, scale is with the dried compound pipeline complex pipeline inwall of wind.
2. according to the preparation method of the described compound pipeline complex pipeline of claim 1, it is characterized in that: among the described step C, cooling-lubricant is made of chlorinated paraffin wax and rosin, and its percentage by weight is: chlorinated paraffin wax 48-60%, rosin 40-52%.
3. the particular manufacturing craft of the preparation method of each described compound pipeline complex pipeline of claim 1 to 2, it is characterized in that: comprise the die ontology of making by nylon king 1010 materials, on described die ontology, be provided with the connecting hole that is connected with the plug of drawbench, on the die ontology front end face, be provided with knuckle.
4. according to the particular manufacturing craft of the preparation method of the described compound pipeline complex pipeline of claim 3, it is characterized in that: the length of described die ontology is 1.2～1.5 times of carbon steel tubing internal diameter.
5. according to the particular manufacturing craft of the preparation method of claim 3 or 4 described compound pipeline complex pipelines, it is characterized in that: the external diameter of described die ontology is 1.05～1.1 times of copper pipe external diameter.
6. according to the particular manufacturing craft of the preparation method of claim 3 or 4 described compound pipeline complex pipelines, it is characterized in that: the aperture of described connecting hole is 0.1～0.25 times of external diameter of described die ontology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110168508A CN102284546A (en) | 2011-06-22 | 2011-06-22 | Method and special die for manufacturing composite pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110168508A CN102284546A (en) | 2011-06-22 | 2011-06-22 | Method and special die for manufacturing composite pipeline |
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| CN102284546A true CN102284546A (en) | 2011-12-21 |
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| CN201110168508A Pending CN102284546A (en) | 2011-06-22 | 2011-06-22 | Method and special die for manufacturing composite pipeline |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736762A (en) * | 2014-02-16 | 2014-04-23 | 芜湖鑫力管道技术有限公司 | Internal extrusion special die for producing composite copper pipe |
| CN103817411A (en) * | 2014-02-23 | 2014-05-28 | 芜湖鑫力管道技术有限公司 | High-strength composite stainless steel flagpole and welding method thereof |
| CN104325747A (en) * | 2014-11-24 | 2015-02-04 | 芜湖鑫力管道技术有限公司 | Copper-clad steel composite rod and production method thereof |
| CN104399773A (en) * | 2014-11-27 | 2015-03-11 | 中国海洋石油总公司 | Processing technology for high-grade steel seamless metallurgical composite pipe |
| CN110153219A (en) * | 2019-07-01 | 2019-08-23 | 倪立兵 | A kind of composition metal water pipe molding die tooling assembly |
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| CN1374158A (en) * | 2002-04-20 | 2002-10-16 | 关士杰 | Production process of composite pipe with stainless steel lining |
| CN101327510A (en) * | 2008-06-10 | 2008-12-24 | 汪正友 | Method for combining carbon steel-based stainless steel internal composited tube |
| CN101412047A (en) * | 2008-11-28 | 2009-04-22 | 佛山市顺德区三胜家电制造有限公司 | Technique for producing copper-clad aluminium composite tube or stick |
| CN201249210Y (en) * | 2008-08-21 | 2009-06-03 | 汪正友 | Inner compound die for carbon steel-based stainless steel inner compound pipe |
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2011
- 2011-06-22 CN CN201110168508A patent/CN102284546A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1374158A (en) * | 2002-04-20 | 2002-10-16 | 关士杰 | Production process of composite pipe with stainless steel lining |
| CN101327510A (en) * | 2008-06-10 | 2008-12-24 | 汪正友 | Method for combining carbon steel-based stainless steel internal composited tube |
| CN201249210Y (en) * | 2008-08-21 | 2009-06-03 | 汪正友 | Inner compound die for carbon steel-based stainless steel inner compound pipe |
| CN101412047A (en) * | 2008-11-28 | 2009-04-22 | 佛山市顺德区三胜家电制造有限公司 | Technique for producing copper-clad aluminium composite tube or stick |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736762A (en) * | 2014-02-16 | 2014-04-23 | 芜湖鑫力管道技术有限公司 | Internal extrusion special die for producing composite copper pipe |
| CN103817411A (en) * | 2014-02-23 | 2014-05-28 | 芜湖鑫力管道技术有限公司 | High-strength composite stainless steel flagpole and welding method thereof |
| CN104325747A (en) * | 2014-11-24 | 2015-02-04 | 芜湖鑫力管道技术有限公司 | Copper-clad steel composite rod and production method thereof |
| CN104399773A (en) * | 2014-11-27 | 2015-03-11 | 中国海洋石油总公司 | Processing technology for high-grade steel seamless metallurgical composite pipe |
| CN110153219A (en) * | 2019-07-01 | 2019-08-23 | 倪立兵 | A kind of composition metal water pipe molding die tooling assembly |
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Application publication date: 20111221 |