CN1480268A - Method for hot rolling tube of copper and copper alloy - Google Patents
Method for hot rolling tube of copper and copper alloy Download PDFInfo
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Abstract
A hot rolling technology for manufacturing copper (or copper alloy) pipe by use of planetary pipe mill includes machining the surface of raw pipe, heating to crystallizing temp, high-speed rolling at 701-850 deg.C, and fast cooling. Its advantages are simple technology, high utilization rate of raw material, and high quality of product.
Description
Technical field
The present invention relates to the hot-rolling method of a kind of manufactured copper and copper-alloy pipe-material, this method belongs to metal pipe material hot rolling technology.Specifically, this method is a kind of utilization hot rolling and thermomechanical treatment principle, to horizontal casting pipe or extrusion tube blank, through machining surface processing purifying treatment and online heating, continue you under surpassing the recrystallization temperature condition in deformation speed rolling, take place to form the hot rolling product behind the dynamic recrystallization, at last by online quick cooling, and the method for processing and manufacturing copper and copper-alloy pipe-material.
Background technology
The manufacture method of existing copper and copper-alloy pipe-material, main have four kinds of drilling/rolling method, extrusion process, cold working casting and roll process and temperature processing casting and roll processes etc.And traditional preceding two kinds of methods exist all that operation is many, lumber recovery is low, the high deficiency of tubing manufacturing cost, are substituted by other technology gradually.And the third cold working casting and roll process is 88101739 as the disclosed application number of Chinese patent, and name is called " method of hard cooper and copper alloy tube ", and this method is with continuously cast billet for pipe-making or extrusion tube blank, directly sends into the PSW three-roller planetary rolling mill and carries out cold rolling.It is the internal friction that utilizes reduction of pipe area and material deformation to be produced, and makes pipe under the temperature condition that is warmed up to 250 ℃～700 ℃ (being more than the recrystallize starting temperature of respective material), carries out the rolling a kind of more advanced method at present of tubing processing.This method has that operation is few, cost is low and the lumber recovery advantages of higher.But because the technical scheme that this method is taked is cold rolling processing, enter the temperature of the pipe of milling train distorted area, substantially be envrionment temperature, and cause the starting stage of pipe after entering the distorted area, can produce a large amount of crackles at the surfaces externally and internally of pipe, although by pressing, but still some crackle is present in the section structure of goods tubing with folding mode the very most of meeting of crackle in the operation of rolling.Simultaneously, because this method only depends on self-deformation internal friction heating up, it is introduced that rolling temperature is 250 ℃～700 ℃.Obviously it surpasses the superheating temperature deficiency of recrystallization temperature, when tube rolling terminates, the length direction of tubing and between with many tubing of a collection of rolled piece the incomplete recrystallized structural difference of various degrees, this incomplete recrystallize causes the local tensile strength of finished product tubing and unit elongation all unstable.Because this cold rolling mode makes the dynamic recrystallization process just begin to the middle part, distorted area, consequently this recrystallize is incomplete, inadequate, and is unfavorable for the fine and closely woven and pore of tubing section structure, the eliminating of slag inclusion.In addition, pipe is sent into the distorted area with envrionment temperature can cause serious impact to rolling mill bearing and gear, and reduced the work-ing life of milling train, also can cause the rolling quality instability in summer in winter.Especially this cold rolling process, to the casting flaw of the inevitable existence of its supplied materials pipe surface institute, do not make any purifying treatment, this is in the pipe operation of rolling, casting flaws such as slag inclusion that the pipe surface can be existed and pore rub up in the section structure of tubing inevitably.Known, copper and copper alloy are the hot-work brittle zones at 600 ℃～700 ℃, add trade union in this temperature and produce a large amount of thermal cracks, the pipe workpiece quality variation in causing processing.Therefore, take a broad view of the method for existing cold working casting copper and copper alloy tube, the existing collapsible crackle of its finished product tubing, incomplete recrystallized, the existence of pipe surface casting flaw, thus will have a strong impact on the quality of pipe workpiece quality and follow-up deep processing tubing.
The 4th kind of temperature processing casting and roll process, as the disclosed application number of Chinese patent is No. 02138022.8, name is called " method of warm processing and manufacturing copper and copper alloy tube ", this method is with continuously cast billet for pipe-making or extrusion tube blank, through being preheated to envrionment temperature between the recrystallize starting temperature, send into three-roller planetary rolling mill then and be rolled, rolling back is incubated under the condition that is higher than 30～80 ℃ of rolling temperatures, rolled piece is cooled off fast realize again.It is to utilize preheating temperature and the pipe area reduction distortion institute heat that produces to superpose, pipe is rolled being higher than under 700 ℃ of temperature, substantially overcome the major defect of No. 88101739.6 patent cold rolling process of Chinese patent, but synergetic rolling temperature is easy-regulating not, makes the quality of item instability; To the impact of equipment such as gear, rolled piece end preheating temperature was different with its elsewhere when this method was nipped for reducing rolled piece simultaneously, and is wayward and reduced rolling efficiency; For making the abundant recrystallize of rolled piece, need follow-up insulation, increased energy consumption and operation.Therefore, still there is defective in this rolling method, needs to improve.
Summary of the invention
The copper of the object of the present invention is to provide that a kind of manufacturing process is few, lumber recovery is high, low cost of manufacture, goods pipe workpiece quality are good, stable and the hot-rolling method of copper-alloy pipe-material are to overcome the deficiency of prior art.
Realize the principle of the object of the invention, mainly based on utilization hot-work and thermomechanical treatment principle, formerly continuously cast billet for pipe-making or extrusion tube blank are done surperficial machining removal of impurities processing, online then heating pipe surpasses the starting temperature of its recrystallize, and then pipe is imported the distortion rolling equipment, make pipe roll forming in 701 ℃～850 ℃ temperature range, cool off fast with the rolled parts that is about to be shaped and make finished product.
The said hot rolling processing of the present invention with the fundamental difference place of cold rolling processing is, the present invention at first is heated on the recrystallize starting temperature by online the pipe of handling through machining surface processing removal of impurities, this technical measures to the online heating of pipe, in the time of can reducing rolling nipping effectively to the surging force of milling train, increase the life-span of rolling mill bearing and gear, and can guarantee the stable of the rolling product structure quality of degree in summer in winter, can cut down the consumption of energy effectively, reduce manufacturing cost.And rise to 701 ℃～850 ℃ by the online rolling temperature that on crystallization onset temperature, can make pipe that is heated to, make it to have enough superheating temperature generation dynamic recrystallizations, avoid the hot-work brittle zone of copper and copper alloy, thereby improved the coefficient of extension of pipe distortion, prolonged the process of pipe deformed region scope and dynamic recrystallization, and make pipe have enough conditions, realize perfect recrystallization, thereby make the present invention reach the original intention that improves rolling efficiency and pipe workpiece quality.
Said hot rolling processing of the present invention and warm-rolling processing essential distinction are, online Heating temperature is higher than the recrystallize starting temperature, make rolling temperature can reach 701 ℃～850 ℃, make it to have enough superheating temperature generation dynamic recrystallizations, avoid the hot-work brittle zone of copper and copper alloy, thereby improved the coefficient of extension of pipe distortion, the process that has prolonged pipe deformed region scope and dynamic recrystallization does not need that the rolled piece after rolling is carried out the samming insulation and handles; To the impact of milling train, do not need heat treated when overcoming rolled piece simultaneously and nipping to workpiece front end.Save process flow, improved rolling efficiency, increased the milling material quality of stability.
The present invention just is in the dynamic recrystallization state owing to the pipe that enters the distorted area is out of shape at the beginning, so can allow to use roll speed faster, thereby has increased the output of separate unit milling train.In addition, online heating makes the rolling temperature homogenizing of distorted area, has reduced and has rolled the temperature variation that back tubing brings because of the distorted area nonaffine deformation, can obtain equi-axed crystal completely when quick cooling subsequently.
The present invention relates to the hot-rolling method of a kind of manufactured copper and copper alloy tube, it is characterized in that, utilize the planetary rolling machine that copper and copper alloy pipe are carried out hot rolling, the rolling step of described hot-rolling method is as follows:
The first step is carried out machining to the surface of pipe, to remove the casting flaw on pipe surface;
Second the step, online heating pipe, under protective atmosphere with heating of pipe blank to more than the recrystallize starting temperature of its respective material;
In the 3rd step, the pipe hot rolling is shaped, and under protective atmosphere the pipe after the processing of second step is imported the planetary rolling machine, makes pipe carry out hot rolling with gross distortion, two-forty under the rolling temperature between 701 ℃～850 ℃ and is shaped, and obtain tube rolling spare;
In the 4th step, cold rolling spare makes described rolled parts by the emulsion bath fast, realizes cooling fast.
Wherein utilize the rolling method of planetary rolling machine that the pipe of copper and copper alloy is carried out hot rolling, the further rolling step of described hot-rolling method is as follows:
In described hot-rolling method, be to utilize 2-6 roller planetary rolling machine with protective atmosphere device, adjustable pipe rolling temperature, the pipe of copper and copper alloy is carried out hot rolling, wherein said
The first step is carried out machine to the surface of pipe and is added step, be to adopt machining process such as car or milling, and its machining depth of cut is controlled in 0.3mm～0.5mm scope, to remove the casting flaw on pipe surface;
In second step, described online heating pipe step is to adopt in the ingress of described planetary rolling machine online Medium frequency induction coil to be installed, under protective atmosphere with heating of pipe blank to 250～700 ℃;
The 3rd step, described pipe hot rolling forming step, be under protective atmosphere to the pipe after the second step heating under the rolling temperature between 701 ℃～850 ℃, greater than 5 with carry out hot rolling with the roll speed of 10m/min-30m/min and be shaped, obtain tube rolling spare with the single pass unit elongation;
In the 4th step, the rolled parts of described roll forming with the rolling speed of 10m/min～30m/min, is the emulsion bath realization cooling fast of 1～1.5m by length.
The present invention is according to copper and the different recrystallization temperature of multiple copper alloy, and above steps can have multiple concrete technical measures.But the present invention through repeatedly the experiment and preferably the concrete technical measures of each step be:
Pipe machining surface procedure of processing, what take is car or the machining process that mills, and its machining depth of cut, is controlled in the scope that can remove pipe surface casting flaw.By the processing of pipe machining surface, make the pipe surface be non-oxidation light attitude.And for the horizontally continuous casting copper pipes base, depth of cut generally is controlled in 0.3mm～0.5mm scope.And be higher than Vehicle Processing owing to mill the processing work efficiency, so the present invention's recommendation is to mill processing.Formed waste material after milling the processing cutting can be collected the back reuse immediately.
The online heating steps of pipe is under the protective atmosphere condition, will be through the mach pipe in first step surface, online being heated between 250 ℃～700 ℃.The online heating technique measure that the present invention takes is that online Medium frequency induction coil is installed in employing in the milling train ingress.
The rolling step of pipe is under the protective atmosphere condition, and second step was heated to pipe between 250 ℃～700 ℃, and then imports the planetary rolling machine.In fact the present invention is on the continuous production streamline of a time, carries out 4 steps of the present invention successively.Thereby correctly say, be pipe with heating, and then import the rolling district of distortion.And pipe is under 701 ℃～850 ℃ rolling temperature condition, roll forming.Because pipe is at it deformation to take place more than the recrystallization temperature and under very big superheating temperature state, undoubtedly because the plasticity-of pipe is big, the coefficient of extension increase is reached more than 5, the distorted area is longer, it is more complete, more abundant that everything helps the process of dynamic recrystallization of copper and copper alloy, obtaining fine crystalline structure more uniformly, because the heat pipe base is under the roll off repeatedly of a plurality of rolls of multiple roll planetary rolling, thus the success that has guaranteed to produce high quality tubing effectively.
At the rolled parts cooling step, be that and then third step is quickly cooled to envrionment temperature with the rolled parts of roll forming.And the quick cooling purpose of water-bath of the present invention is to make the rolling speed of tube rolling spare with 10m/min～30m/min, by what realize in the emulsion bath that is about 1～1.5m.Cooling essence is a kind of thermomechanical treatment fast, and its purpose mainly is the crystal grain of refinement copper, makes tubing of the present invention, is in the excellent mechanical property state in follow-up deep-processing process and even under the working condition of subsequent product for a long time.
As described in formerly, the rolling temperature of pipe is the principal element of decision pipe rolling quality.In view of above-mentioned consideration, the present invention pays attention to being out of shape selecting for use of rolling equipment especially, requires selected distortion rolling equipment should satisfy adjustable pipe texturing temperature at least, has the protective atmosphere device, to pipe requirement such as roll off and roll off area be bigger repeatedly.The present invention preferably is out of shape rolling equipment, is 2～6 roller planetary rolling machines.
The present invention, realizes by sending out following three kinds of technical measures in online heating, rolling and cool off online adjusting and control on three step continuous processing lines for the pipe rolling temperature:
First kind is the control technique measure that is applied on the concerned process steps.It is by adjusting pipe feed rate, heating of pipe blank temperature, regulating and control the pipe rolling temperature by rolling coolant rate, the single pass coefficient of extension of roll.
And second kind be the control technique measure that is applied in the relevant speed of rolling equipment.It is that the height of the rate of deformation that realizes by the rotating speed of said planetary rolling machine rotary disk and rolling speed is regulated and control the pipe rolling temperature.The present invention preferably adjusts the speed range of planetary rolling machine rotary disk, be controlled within 250rpm～500rpm, and the scope of adjustment rolling speed is controlled within 10m/min～30m/min.
And the third is the control technique measure that is applied on the dependency structure of rolling equipment.It is to send angle to by the roll of adjusting said planetary rolling machine, and regulation and control pipe rolling temperature.The present invention preferably adjusts the scope that said roll is sent angle to, is controlled between 6 °～8 ° degree.
Adopt the technical solution of the present invention, can bring when manufactured copper and copper alloy tube that manufacturing process is few, lumber recovery is high, the beneficial effect of low cost of manufacture, goods pipe workpiece quality good stable, overcome the deficiency and the defective of prior art.
Embodiment
To be described further hot-rolling method of the present invention by following embodiment, so that the present invention is realized that the technical scheme of its purpose and characteristics obtain more detailed understanding.
A kind of preferred implementation of the present invention is rolling phosphorized copper (TP2) pipe.Rolling is to carry out on XR-SG90 three-roller planetary tube rolling mill (for the self-produced a kind of three-roller planetary tube rolling mill of applicant).Pipe is a horizontal casting, original dimension is φ 86 * 23mm, pipe is via the processing units that mills of 3 milling heads before rolling, carry out surface treatment, its depth of cut is 0.3mm, makes the pipe surface be non-oxidation light attitude, online then intermediate frequency (2500Hz) induction heating, make heating of pipe blank to 260 ℃, carry out rolling processing then by XR-SG90 three-roller planetary tube rolling mill.Pipe is warming up to 750 ℃ after entering the distorted area very soon, and tube rolling mill is that 15m/min carries out work with the rolling speed, and constantly with its rolling pipe fitting send to forward.Even enter with the rolled tube part in the emulsion bath of long 1.5m, rolling pipe fitting approximately in the time in 6 seconds by water-bath, and fast cooling, crooked then rolling.Copper pipe specification after rolling is φ 47 * 2.2mm, and coefficient of extension is 14.7.Copper pipe surface does not have any folding pattern and other defect exists, and rolls back body metallographic structure and is very thin equi-axed crystal state (perfect recrystallization attitude).Tensile strength and unit elongation are respectively 240Mpa～250MPa and 45%～55%.The reflection of eddy current test assay, every km only is 0～2 defect point.Rolling back tubing is best in quality, and rolling is successful.
Another preferred embodiment of the present invention is hot rolling horizontal casting HSn70-1 brazed copper tube.Rollingly on XR-SG90 three-roller planetary tube rolling mill, carry out, the pipe original dimension is φ 83 * 22mm, through milling processing processing is cut on the pipe surface, depth of cut is 0.5 mm, make the pipe surface be the non-oxidation bright state, adopt online intermediate frequency (2500Hz) induction heating then, make pipe be warming up to 400 ℃, enter XR-SG90 three-roller planetary tube rolling mill then, thereafter rolling as above-mentioned first embodiment, and its rolling temperature is 800 ℃, and rolling speed is 18m/min, and the brazed copper tube specification after rolling is φ 47 * 2.2mm, its coefficient of extension is 13.6, copper pipe surface does not have any folding pattern and other defect, and its tensile strength and unit elongation are respectively 290Mpa～380MPa and 25%～40%, and Electronic Speculum shows that the metallographic structure of rolling the back body is very fine and close.Rolling is successful.This copper pipe does not almost have the disconnected pipe phenomenon that the defective because of body itself takes place in follow-up stretching.
In sum, the on-line continuous flow chart that the present invention had is few, the level of automation height, roll speed is fast, and the lumber recovery height, the tubing low cost of manufacture, advantages such as tubing quality better, overcome defective and deficiency that prior art exists, compared with the prior art, the present invention has tangible substantive distinguishing features and obvious improvement.
The foregoing description is the understanding of the present invention, is not considered as limitation of the present invention, any accommodation that those of ordinary skill in the art makes on basis of the present invention, all belong to protection scope of the present invention without the scheme of creative work.
Claims (6)
1, the hot-rolling method of a kind of manufactured copper and copper alloy tube is characterized in that, utilizes the planetary rolling machine that the pipe of copper and copper alloy is carried out hot rolling, and the rolling step of described hot-rolling method is as follows:
The first step is carried out machining to the surface of pipe, to remove the casting flaw on pipe surface;
Second the step, online heating pipe, under protective atmosphere with heating of pipe blank to more than the recrystallize starting temperature of its respective material;
In the 3rd step, the pipe hot rolling is shaped, and under protective atmosphere the pipe after the processing of second step is imported the planetary rolling machine, makes pipe carry out hot rolling with gross distortion, two-forty under the rolling temperature between 701 ℃～850 ℃ and is shaped, and obtain tube rolling spare;
In the 4th step, cold rolling spare makes described rolled parts by the emulsion bath fast, realizes cooling fast.
2, the hot-rolling method of a kind of manufactured copper according to claim 1 and copper alloy tube; it is characterized in that; utilization has 2～6 roller planetary rolling machines of protective atmosphere device, adjustable pipe rolling temperature, and the pipe of copper and copper alloy is carried out hot rolling, and is wherein said
The first step is carried out machine to the surface of pipe and is added step, be to adopt machining process such as car or milling, and its machining depth of cut is controlled in 0.3mm～0.5mm scope, to remove the casting flaw on pipe surface;
In second step, described online heating pipe step is to adopt in the ingress of described planetary rolling machine online Medium frequency induction coil to be installed, under protective atmosphere with heating of pipe blank to 250～700 ℃;
The 3rd step, described pipe hot rolling forming step, be under protective atmosphere to the pipe after the second step heating under the rolling temperature between 701 ℃～850 ℃, greater than 5 distortion with carry out hot rolling with the roll speed of 10～30m/min and be shaped, obtain tube rolling spare with the single pass coefficient of extension;
In the 4th step, the rolled parts of described roll forming with the rolling speed of 10～30m/min, is the emulsion bath realization cooling fast of 1～1.5m by length.
3, the hot-rolling method of a kind of manufactured copper according to claim 1 and 2 and copper alloy tube, it is characterized in that, in the 3rd step, described pipe rolling temperature is by regulating pipe feed rate, heating of pipe blank temperature, regulating and control by rolling coolant rate, the single pass coefficient of extension of roll.
4, the hot-rolling method of a kind of manufactured copper according to claim 1 and 2 and copper alloy tube, it is characterized in that, in the 3rd step, described rolling temperature be by planetary rolling machine rotary disk rotating speed in 250～500rpm scope, and the adjusting of rolling speed in 10～30m/min scope regulate and control.
5, the hot-rolling method of a kind of manufactured copper according to claim 1 and 2 and copper alloy tube is characterized in that, in the 3rd step, described rolling temperature is to send the adjusting of angle in 6 °～8 ° scopes to by planetary rolling machine roll to regulate and control.
6, the hot-rolling method of a kind of manufactured copper according to claim 1 and 2 and copper alloy tube is characterized in that, said pipe material is T2, TP1, TP2, B10, B30, HSn70-1, HA177-2, H62, H68.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03149786 CN1221337C (en) | 2003-08-06 | 2003-08-06 | Method for hot rolling tube of copper and copper alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03149786 CN1221337C (en) | 2003-08-06 | 2003-08-06 | Method for hot rolling tube of copper and copper alloy |
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| CN1480268A true CN1480268A (en) | 2004-03-10 |
| CN1221337C CN1221337C (en) | 2005-10-05 |
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| CN 03149786 Expired - Fee Related CN1221337C (en) | 2003-08-06 | 2003-08-06 | Method for hot rolling tube of copper and copper alloy |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007121622A1 (en) * | 2006-04-24 | 2007-11-01 | Jiangsu Xingrong Hi-Tech Company Limited | A Cu/Al COMPOSITE PIPE AND A MANUFACTURING METHOD THEREOF |
| CN100448597C (en) * | 2004-09-30 | 2009-01-07 | 中铝洛阳铜业有限公司 | Cupronickel condensation tube production process using disk stretch |
| CN101912880A (en) * | 2010-07-06 | 2010-12-15 | 浙江海亮股份有限公司 | Novel planetary tube rolling mill and planetary rolling method for copper alloy tubes |
| WO2011047524A1 (en) * | 2009-10-19 | 2011-04-28 | 宁波金田铜管有限公司 | Three-roller planetary rolling method for rolling brass pipe |
| CN102728650A (en) * | 2012-06-20 | 2012-10-17 | 金龙精密铜管集团股份有限公司 | Processing method of metal pipe material |
| CN101804564B (en) * | 2009-02-16 | 2013-03-27 | 方崇实 | High-efficiency short-flow production line of composite material of high-alloy steel and high-alloy steel |
| CN103230961A (en) * | 2013-05-03 | 2013-08-07 | 江苏兴荣高新科技股份有限公司 | Copper alloy pipe and manufacturing method thereof |
| CN103769419A (en) * | 2014-02-11 | 2014-05-07 | 北京科技大学 | Pull rolling forming method and device |
| CN104607882A (en) * | 2015-02-08 | 2015-05-13 | 浙江同诚合金铜管有限公司 | Pickling-free manufacturing method for copper alloy pipe with cast rolling method |
| CN106001105A (en) * | 2016-04-20 | 2016-10-12 | 广东冠邦科技有限公司 | Method for manufacturing free-cutting stainless steel bar through hot rolling |
| CN108060327A (en) * | 2017-12-22 | 2018-05-22 | 大连英蕴科技有限公司 | A kind of ship B30 material preparation methods |
| CN110961485A (en) * | 2019-11-29 | 2020-04-07 | 金川集团股份有限公司 | Seamless cupronickel large pipe and production method thereof |
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- 2003-08-06 CN CN 03149786 patent/CN1221337C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100448597C (en) * | 2004-09-30 | 2009-01-07 | 中铝洛阳铜业有限公司 | Cupronickel condensation tube production process using disk stretch |
| WO2007121622A1 (en) * | 2006-04-24 | 2007-11-01 | Jiangsu Xingrong Hi-Tech Company Limited | A Cu/Al COMPOSITE PIPE AND A MANUFACTURING METHOD THEREOF |
| CN101804564B (en) * | 2009-02-16 | 2013-03-27 | 方崇实 | High-efficiency short-flow production line of composite material of high-alloy steel and high-alloy steel |
| WO2011047524A1 (en) * | 2009-10-19 | 2011-04-28 | 宁波金田铜管有限公司 | Three-roller planetary rolling method for rolling brass pipe |
| CN101912880B (en) * | 2010-07-06 | 2012-12-12 | 浙江海亮股份有限公司 | Novel planetary tube rolling mill |
| CN101912880A (en) * | 2010-07-06 | 2010-12-15 | 浙江海亮股份有限公司 | Novel planetary tube rolling mill and planetary rolling method for copper alloy tubes |
| CN102728650A (en) * | 2012-06-20 | 2012-10-17 | 金龙精密铜管集团股份有限公司 | Processing method of metal pipe material |
| CN103230961A (en) * | 2013-05-03 | 2013-08-07 | 江苏兴荣高新科技股份有限公司 | Copper alloy pipe and manufacturing method thereof |
| CN103230961B (en) * | 2013-05-03 | 2015-09-09 | 江苏兴荣高新科技股份有限公司 | The manufacture method of copper alloy tube and copper alloy tube |
| CN103769419A (en) * | 2014-02-11 | 2014-05-07 | 北京科技大学 | Pull rolling forming method and device |
| CN103769419B (en) * | 2014-02-11 | 2016-04-27 | 北京科技大学 | One is drawn and is rolled manufacturing process and device |
| CN104607882A (en) * | 2015-02-08 | 2015-05-13 | 浙江同诚合金铜管有限公司 | Pickling-free manufacturing method for copper alloy pipe with cast rolling method |
| CN106001105A (en) * | 2016-04-20 | 2016-10-12 | 广东冠邦科技有限公司 | Method for manufacturing free-cutting stainless steel bar through hot rolling |
| CN108060327A (en) * | 2017-12-22 | 2018-05-22 | 大连英蕴科技有限公司 | A kind of ship B30 material preparation methods |
| CN110961485A (en) * | 2019-11-29 | 2020-04-07 | 金川集团股份有限公司 | Seamless cupronickel large pipe and production method thereof |
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| CN1221337C (en) | 2005-10-05 |
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Granted publication date: 20051005 Termination date: 20120806 |