CN204892554U - Mill train - Google Patents

Mill train Download PDF

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Publication number
CN204892554U
CN204892554U CN201520665216.XU CN201520665216U CN204892554U CN 204892554 U CN204892554 U CN 204892554U CN 201520665216 U CN201520665216 U CN 201520665216U CN 204892554 U CN204892554 U CN 204892554U
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CN
China
Prior art keywords
protective cover
safety cover
roll
rolling
milling train
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201520665216.XU
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Chinese (zh)
Inventor
韩道旺
张俊
张雪荣
黄斌
钱峰
李琦铭
宋艳玲
陈燕才
陈刚
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Wuhan Iron and Steel Co Ltd
Original Assignee
Wuhan Iron and Steel Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN201520665216.XU priority Critical patent/CN204892554U/en
Application granted granted Critical
Publication of CN204892554U publication Critical patent/CN204892554U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a mill train, including casting machine and atmosphere safety cover, set gradually in the atmosphere safety cover and has firstly batched the stove, firstly batched the machine, firstly turned to that pinch roll and baffle platform, first tensimeter roller, hydraulic pressure are cut, four roller reversing mill, second tensimeter roller, second turn to the pinch roll and baffle platform, second coiling machine, second coiler furnace, the atmosphere safety cover including erect the cross -section for the U type fix subaerial last safety cover and mobilizable under the safety cover, the both ends of going up safety cover and lower safety cover are equipped with the shrouding of trough of belt mouth, it includes shell, inner shell, strengthening rib, insulation material respectively with lower safety cover to go up the safety cover, the strengthening rib is arranged in between inner shell and the shell, insulation material fills the space between the strengthening rib, be equipped with the nitrogen gas ascending pipe down on the safety cover. The utility model provides an easy oxidation in current strip hot rolling in -process surface, be difficult to be processed into the problem of thickness <= 0.8mm's extremely thin strip.

Description

A kind of milling train unit
Technical field
The utility model relates to a kind of milling train unit being applied to metallurgy industry band steel production field.
Background technology
CSP is the emerging hot-strip abbreviated system of metallurgy industry, is one of most important revolutionary technology of steel and iron industry after oxygen converter steelmaking, continuous casting steel machine.Compare with traditional handicraft, continuous casting and rolling technique of sheet bar can become the sheet billet of 50 ~ 70mm molten steel casting, after soaking, directly enter finishing mill roll out coiled sheet (or roll coil of strip).This technique simplifies technological process, decrease equipment, have to build and do not have small investment, the advantage that with short production cycle, production cost is low, represent the developing direction of world today's strip technology.
But strip is in heating and course of hot rolling, belt steel surface easily contacts with air and is oxidized, and produces iron scale, can cause the mass defect such as spot and pockmark after iron scale press-in Surfaces of Hot Rolled Strip.Simultaneously, because red scale (FeO) has the characteristic such as higher hardness and difficult pickling removal, once be formed at belt steel surface, also can strengthen the rolling machining deformation difficulty of product in subsequent handling, therefore existing thin-belt casting rolling unit is difficult to the production requirement realizing below 0.8mm strip.
Therefore, how to roll out that thickness is thinner, performance is more excellent, the ultra-thin strip of surperficial non-oxidation, be the significant technology issues in thin-belt casting rolling field always.
Utility model content
The purpose of this utility model is to provide a kind of milling train unit, and this unit solves surface in existing band course of hot rolling and is easily oxidized, is difficult to the problem of the ultra-thin strip being processed into thickness≤0.8mm.
The technical scheme that the utility model adopts is: a kind of milling train unit, comprise the casting machine set gradually, first coiler furnace, first coiling machine, first turning, clamping and conveying roller and guide board platform, first tension meter roll, hydraulic shear, four-high reversing mill, second tension meter roll, second turning, clamping and conveying roller and guide board platform, second coiling machine, second coiler furnace, described first coiler furnace, first coiling machine, first turning, clamping and conveying roller and guide board platform, first tension meter roll, hydraulic shear, four-high reversing mill, second tension meter roll, second turning, clamping and conveying roller and guide board platform, second coiling machine, second coiler furnace is placed in atmosphere protection cover,
It is the U-shaped upper protective cover fixed on the ground and moveable lower protective cover that described atmosphere protection cover comprises vertical section, and the two ends of described upper protective cover and lower protective cover are provided with the shrouding of band notch;
Described upper protective cover and lower protective cover comprise shell, inner casing, reinforcement, insulation material respectively, and described reinforcement is placed between inner casing and shell, the space of described filled thermal insulation materials between reinforcement;
Described lower protective cover is provided with nitrogen ascending pipe.
Further scheme is: the left and right sides of described upper protective cover is provided with the visual windows be made up of glass, is convenient to observe belt steel rolling, grasps belt steel rolling situation in real time, improves belt steel rolling quality.
Further scheme is: the two ends of described atmosphere protection cover are provided with gas curtain seals, prevents air from entering in atmosphere protection cover, the heat of influence zone steel, warm rolling quality, also prevent nitrogen and enter in air, cause the waste of the energy.
Further scheme is: described shell, inner casing adopt 1Cr18Ni9Ti steel to be welded, and described insulation material is asbestos or ceramic fibre.
Further scheme is: described milling train unit also includes electronic Quick roll-changing device.Because of four-high reversing mill carrying out temperature, hot rolling operation turns cold rolling operation or cold rolling operation turns temperature, hot rolling operation time need to change working roll, the use energy quick-replaceable working roll of electronic Quick roll-changing device, reduce roll changing time, enhance productivity.
The utility model can realize heat, temperature, cold three kinds of rolling modes, when when carrying out heat, warm-rolling, by the upper protective cover of atmosphere protection cover on lower protective cover, nitrogen is filled with in atmosphere protection cover, and keep pressure-fired, prevent belt steel surface to be oxidized, milling train unit carries out heat, warm-rolling system to band steel; When band steel is carried out cold rolling by needs, close source nitrogen, no longer in atmosphere protection cover, be filled with nitrogen, remove protective cover, milling train unit carries out cold rolling to band steel.The use of atmosphere protection cover makes band steel in heating and course of hot rolling, and belt steel surface does not contact with air and is oxidized, and does not produce iron scale, can not produce the mass defect such as spot and pockmark at Surfaces of Hot Rolled Strip.
The beneficial effect that the utility model produces is: 1, the utility model can make band steel in heating and course of hot rolling, belt steel surface does not contact with air and is oxidized, do not produce iron scale, do not produce the mass defect such as spot and pockmark at Surfaces of Hot Rolled Strip, improve belt steel rolling quality.2, form atmosphere protection cover by upper and lower protective cover, make a rolling unit meet heat, temperature, cold three kinds of rolling process, using value is large, applied widely simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 be upper protective cover look up structural representation;
Fig. 3 is the side-looking structural representation of upper protective cover;
Fig. 4 be upper protective cover face structural representation;
Fig. 5 is the plan structure schematic diagram of lower protective cover;
Fig. 6 is the side-looking structural representation of lower protective cover;
Fig. 7 be lower protective cover face structural representation;
Fig. 8 is the process chart of milling train unit.
In figure: 1, casting machine, 2, first coiling machine, 3, first coiler furnace, 4, first turning, clamping and conveying roller and guide board platform, 5, first tension meter roll, 6, hydraulic shear, 7, four-high reversing mill, 14, second tension meter roll, 8, second turning, clamping and conveying roller and guide board platform, 9, second coiler furnace, 10, roller-way, 11, second coiling machine, 12, coil car, 13, atmosphere protection cover, 15, upper protective cover, 16, lower protective cover, 17, shrouding, 19, shell, 20, inner casing, 21, reinforcement, 22, insulation material, 23, nitrogen ascending pipe, 24, visual windows, 25, gas curtain seals.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
See Fig. 1-Fig. 7, a kind of milling train unit, comprise the casting machine 1 set gradually, first coiler furnace 3, first coiling machine 2, first turning, clamping and conveying roller and guide board platform 4, first tension meter roll 5, hydraulic shear 6, four-high reversing mill 7, second tension meter roll 14, second turning, clamping and conveying roller and guide board platform 8, second coiling machine 11, second coiler furnace 9, described first coiler furnace 3, first coiling machine 2, first turning, clamping and conveying roller and guide board platform 4, first tension meter roll 5, hydraulic shear 6, four-high reversing mill 7, second tension meter roll 14, second turning, clamping and conveying roller and guide board platform 8, second coiling machine 11, second coiler furnace 9 is in atmosphere protection cover 13,
Described atmosphere protection cover 13 comprises the upper protective cover 15 and moveable lower protective cover 16 that fix on the ground, the vertical section of described upper protective cover 15 and lower protective cover 16 is U-shaped, and the two ends of described upper protective cover 15 and lower protective cover 16 are provided with the shrouding 17 of band notch, the setting of notch is the turnover for the ease of being with steel; The two ends of described atmosphere protection cover 13 are provided with gas curtain seals 25, and described gas curtain seals 25 is placed in inside shrouding 17, to prevent air from entering in atmosphere protection cover 13, the heat of influence zone steel, warm rolling quality, also prevent nitrogen enters in air, causes the waste of the energy;
Described upper protective cover 15 and lower protective cover 16 comprise shell 19, inner casing 20, reinforcement 21, insulation material 22 respectively, and described reinforcement 21 is placed between inner casing 20 and shell 19, and described insulation material 22 is filled in the space between reinforcement 21;
Described lower protective cover 16 is provided with nitrogen ascending pipe 23, injects in atmosphere protective cover 13 to facilitate nitrogen; Nitrogen temperature is controlled, adjustable, and when hot rolling, warm-rolling, atmosphere protection cover 13 comes into operation, and time cold rolling, on atmosphere protection cover 13, protective cover 15 is opened, and nitrogen does not come into operation.
The left and right sides of described upper protective cover is provided with the visual windows 25 be made up of glass, so that observation belt steel rolling, grasps belt steel rolling situation in real time, improves belt steel rolling quality;
Because of four-high reversing mill carrying out temperature, hot rolling operation turns cold rolling operation or cold rolling operation turns temperature, hot rolling operation time need to change working roll, therefore, this milling train unit also includes electronic Quick roll-changing device, the use energy quick-replaceable working roll of electronic Quick roll-changing device, reduce roll changing time, enhance productivity.
In the present embodiment, in order to increase the intensity of atmosphere protection cover, described shell 19, inner casing 20 can adopt 1Cr18Ni9Ti steel to be welded; In order to increase the heat-insulating property of atmosphere protection cover, described insulation material 22 can be asbestos or ceramic fibre.
When supplied materials is continuous casting billet, atmosphere protection device drops into application, inflated with nitrogen in protective cover, and keeps pressure-fired, prevents belt steel surface to be oxidized.The concrete technological process of production as shown in Figure 8, from casting machine 1, continuous casting billet out directly enters atmosphere protection cover 13 by roller-way 10, after sky crosses the first coiler furnace 3, by lower cut hydraulic shear 6, it is sheared end to end, sky crosses four-high reversing mill 7 and the second tension meter roll 14 again, enter the second coiler furnace 9 to batch, heating, when reaching temperature required, reel reversion in second coiler furnace 9, band steel is empty again crosses four-high reversing mill 7, hydraulic shear 6 and the first tension meter roll 5, enter the first coiler furnace 3 to batch, and taken the lead to clamp to it by the reel of the first coiler furnace 3, now, four-high reversing mill 7 carries out hot rolling or the warm-rolling (working roll is Heat Working Rolls) of multi-pass to it, when being rolled down to desired thickness, band steel all batches and enters the first coiler furnace 3.Open atmosphere protection cover 13, by the electronic Quick roll-changing device of cross sliding type, Heat Working Rolls is replaced by cold roll, band steel from the first coiler furnace 3 out, sky crosses four-high reversing mill 7, under the guiding of the second turning, clamping and conveying roller and guide board platform 8, enter the second coiling machine 11 to batch, then the second coiling machine 11 overturns, tail part of band steel becomes head, under the guiding of the second turning, clamping and conveying roller and guide board platform 8 and the first turning, clamping and conveying roller and guide board platform 4, enter the first coiling machine 2 to clamp, and to build, now, tension meter roll and four-high reversing mill 7 start to devote oneself to work, realize the reciprocal rolling of multi-pass under band steel cold conditions, until produce qualified finished strip.Eventually with steel all enters the second coiling machine 11 and batches, and is undertaken unloading volume by coil car 12.
When supplied materials is cold rolling coil; this milling train unit can be considered a common 4-roller cold rolling mill unit; two coiler furnaces and atmosphere protection cover 13 do not come into operation; cold rolling coil is transported to the second coiling machine 11 by coil car 12; then by the second coiling machine 11, uncoiling is carried out to it, then enter the first coiling machine 2, and between four-high reversing mill 7, carry out the cold conditions rolling of multi-pass; after rolling, undertaken unloading volume by coil car 12.In addition, uniform temperature can also be heated to cold rolling coil, then carry out hot, warm state rolling, its rolling mill practice and Fig. 2 similar, repeat no more.
In the utility model, described four-high reversing mill 7 is arranged between two coiler furnaces and two coiling machines, primarily of compositions such as transmission device, rack, the assembling of roller system, holding-down device of hydraulic, hydraulic working roll bascule, hydraulic bearing roll bascules, there are heat, temperature, cold three kinds of rolling modes.Working roll material selection rich chromium cast iron when heat, warm-rolling, time cold rolling, working roll material adopts 60CrMo, and the work roll profile of two kinds of unlike materials is measure-alike, has interchangeability.Backing roll material is unified adopts 9Cr2Mo.The kind of drive of four-high reversing mill 7 is working roll transmission, namely drives working roll to carry out the rolling of band steel by transmission mechanism and hydraulic pressing mechanism.Working roll includes rotation and mobile two kinds of motions.The former is rolled motion by frictionally, is realized by main driving mechanism of rolling mill; The latter is used for regulating drafts, controls the deformation extent of rolled piece, is realized by screw down mechanism of rolling mill.Transmission device is made up of dc motor, rubbercushioned sleeve bearing coupling, hard-tooth surface speed reducer, drum type gear coupling, double helical tooth roller box etc.Dc motor drives hard-tooth surface speed reducer high speed shaft by rubbercushioned sleeve bearing coupling, be connected by drum type gear coupling and double helical tooth roller box input by slow-speed shaft after deceleration, output is by universal-joint spindle drive upper and lower working roll to make it produce respectively linear velocity is equal, direction of rotation is contrary rolling campaign.Screw down mechanism of rolling mill adopts hydraulic pressing automatic gauge control system (AGC), and namely the adjustment of mill roll-gap has come by being with the hydraulic cylinder of displacement transducer.
In the utility model; when the electronic Quick roll-changing device of cross sliding type realizes hot, warm, cold rolling; the quick-replaceable of working roll, the Main Function of atmosphere protection cover 13 is atmosphere (N2) defencive functions realizing strip-rolling process, prevents from, in band heat, warm-rolling process, surface oxidation occurs.
First tension meter roll 5 is arranged on four-high reversing mill 7 entrance side, for detecting tension force during rolled band steel.First tension meter roll 5 comprises surveys a roller, left pinch roll, right pinch roll and various sensor, and when survey operates, survey a roller rise, left and right pinch roll is opened.During threading operation, survey a roller and fall, two ends pinch roll pinches band steel.
Between the first tension meter roll 5 and four-high reversing mill 7, be provided with hydraulic shear 6, working method is cut under hydraulic pressure, and cutting edge material is CrMoV, hardness: HRC58-62, is mainly used to the irregular part of shear band steel toe tail, makes band steel toe tail smooth, is convenient to threading.
This milling train unit is provided with two coiler furnaces, and version and the function of two coiler furnaces are identical, and Main Function batches band steel, heat, is incubated, and makes rolled piece meet temperature required by rolling mill practice, realize reversible roll coil of strip rolling.Coiler furnace is primarily of compositions such as reel, guide roller, guide plate, electrothermal radiation tube, body of heater, pinch roll, transmission device, basic framework and steel platforms.Reel is driven by decelerator by a direct current generator, and is arranged on basic framework by the bearing block outside body of heater.Bearing and driving oil cylinder, the bearing block of pinch roll and the bearing block of guide roller of front and back guide plate are also arranged on basic framework.Body of heater shell is the structural member of stainless steel, is divided into upper and lower two halves, by the pinned connection at two ends.The thermal insulation layer of thickness 200mm is equipped with, the forward rear deflector sealing of bottom of furnace body in furnace shell.In stove, mode of heating is electrical heating, and heating-up temperature can reach more than 1000 DEG C.Stove inner drum is made up of spool shaft and cylinder drum, and spool shaft is internal water cooling, and reel material is special heat resisting cast steel.
This milling train unit is provided with two coiling machines altogether, and version and the function of two coiling machines are identical, lays respectively at corresponding coiler furnace lower outer.Two coiling machines all possess uncoiling, batch function, and reel is rectangular pyramid axle fanning strip expansion and shrinkage type, is completed the breathing of reel by thrust axis oil cylinder.Be mainly used in the cold conditions operation of rolling, carry out reversible and batch rolling.
This milling train unit is provided with a steel coil transporting trolley, is used for finished steel coils to unload from volume Two coiler mandrel, and is transported to machine set outlet, waits for handling.The method of operation of coil car is electric walking, hydraulic lifting.
At the entrance side of four-high reversing mill and outlet side, the first turning, clamping and conveying roller and guide board platform, the second turning, clamping and conveying roller and guide board platform are set respectively, its Main Function is be transported to four-high reversing mill by strip steel head from the first coiling machine respectively, and be transported on the second coiling machine from four-high reversing mill, to batch, unload volume.
This milling train unit is also provided with the roller-way of some groups of central driving, is mainly used in moving belt steel in the operation of rolling, and plays linking effect between devices.
The utility model adopts nitrogen protection rolling technique, realizes the non-oxidation rolling of band steel, significantly improves strip surface quality.This milling train unit can heat continuous casting billet, be incubated, and multi-pass reversible rolling, thus can produce the paper-thin strip that thickness is only 0.3 ~ 0.5mm.The assembly of this rolling machine has coiler furnace, coiling machine, four-high reversing mill and electronic Quick roll-changing device, thus can realize the hot rolling of band steel, warm-rolling, cold rolling three kinds of rolling modes on same unit, have a tractor serves several purposes function.This milling train unit is multiple functional, equipment is complete, can production low-intensity straight carbon steel, and that can produce again subtracts pickling or exempt from the paper-thin strip of pickling, and energy conservation and consumption reduction effects is remarkable.
After enforcement, annual minimizing thin material, very thin material surface quality defect change the original sentence to 3000 tons, calculate, can produce direct benefit more than 60 ten thousand yuan: 200 yuan/ton × 3000/ ton=600,000 yuan the whole year by the price difference 200 yuan/ton of certified products and substandard products.The more important thing is, produce revolutionary impact by the mode of production of ultra-thin strip.
Casting machine 1 in the utility model, first coiler furnace 3, first coiling machine 2, first turning, clamping and conveying roller and guide board platform 4, first tension meter roll 5, hydraulic shear 6, four-high reversing mill 7, second tension meter roll 14, second turning, clamping and conveying roller and guide board platform 8, second coiling machine 11, second coiler furnace 9, roller-way 10, coil car 12 all can adopt existing equipment, only need by the first coiler furnace 3, first coiling machine 2, first turning, clamping and conveying roller and guide board platform 4, first tension meter roll 5, hydraulic shear 6, four-high reversing mill 7, second tension meter roll 14, second turning, clamping and conveying roller and guide board platform 8, second coiling machine 11, second coiler furnace 9 is placed in atmosphere protection cover 13 just can solve the easily oxidation of existing band course of hot rolling surface, be difficult to the problem of the ultra-thin strip being processed into thickness≤0.8mm, therefore, easy to install, cost is low.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to the utility model claims.

Claims (5)

1. a milling train unit, comprise the casting machine set gradually, first coiler furnace, first coiling machine, first turning, clamping and conveying roller and guide board platform, first tension meter roll, hydraulic shear, four-high reversing mill, second tension meter roll, second turning, clamping and conveying roller and guide board platform, second coiling machine, second coiler furnace, it is characterized in that: described first coiler furnace, first coiling machine, first turning, clamping and conveying roller and guide board platform, first tension meter roll, hydraulic shear, four-high reversing mill, second tension meter roll, second turning, clamping and conveying roller and guide board platform, second coiling machine, second coiler furnace is placed in atmosphere protection cover,
It is the U-shaped upper protective cover fixed on the ground and moveable lower protective cover that described atmosphere protection cover comprises vertical section, and the two ends of described upper protective cover and lower protective cover are provided with the shrouding of band notch;
Described upper protective cover and lower protective cover comprise shell, inner casing, reinforcement, insulation material respectively, and described reinforcement is placed between inner casing and shell, the space of described filled thermal insulation materials between reinforcement;
Described lower protective cover is provided with nitrogen ascending pipe.
2. milling train unit as claimed in claim 1, is characterized in that: the left and right sides of described upper protective cover is provided with the visual windows be made up of glass.
3. milling train unit as claimed in claim 1 or 2, is characterized in that: the two ends of described atmosphere protection cover are provided with gas curtain seals.
4. milling train unit as claimed in claim 1, is characterized in that: described shell, inner casing adopt 1Cr18Ni9Ti steel to be welded, and described insulation material is asbestos or ceramic fibre.
5. milling train unit as claimed in claim 1, is characterized in that: described milling train unit also includes electronic Quick roll-changing device.
CN201520665216.XU 2015-08-28 2015-08-28 Mill train Expired - Fee Related CN204892554U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107030109A (en) * 2017-06-16 2017-08-11 江苏国铝高科铝业有限公司 A kind of single reversing hot mill with coilers located on each side of the mill cold burden band carries test run method
CN108115930A (en) * 2018-01-16 2018-06-05 宁夏共享机床辅机有限公司 A kind of 3D printer protective cover based on FDM
CN110280590A (en) * 2019-07-19 2019-09-27 中国重型机械研究院股份公司 A kind of excellent special steel reversable cold-rolling machine rolling equipment of high yield and milling method
CN113231466A (en) * 2021-05-06 2021-08-10 中国科学院上海高等研究院 Cold rolling equipment and preparation method of single-metal Dy low-temperature soft magnet

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107030109A (en) * 2017-06-16 2017-08-11 江苏国铝高科铝业有限公司 A kind of single reversing hot mill with coilers located on each side of the mill cold burden band carries test run method
CN108115930A (en) * 2018-01-16 2018-06-05 宁夏共享机床辅机有限公司 A kind of 3D printer protective cover based on FDM
CN110280590A (en) * 2019-07-19 2019-09-27 中国重型机械研究院股份公司 A kind of excellent special steel reversable cold-rolling machine rolling equipment of high yield and milling method
CN110280590B (en) * 2019-07-19 2024-03-01 中国重型机械研究院股份公司 Rolling equipment and rolling method of high-grade special steel reversible cold rolling mill
CN113231466A (en) * 2021-05-06 2021-08-10 中国科学院上海高等研究院 Cold rolling equipment and preparation method of single-metal Dy low-temperature soft magnet

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C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20170721

Address after: 430083, Gate No. 2, Qingshan District, Hubei, Wuhan

Patentee after: Wuhan iron and Steel Company Limited

Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang

Patentee before: Wuhan Iron & Steel (Group) Corp.

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151223

Termination date: 20190828