CN102534181B - High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace - Google Patents
High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace Download PDFInfo
- Publication number
- CN102534181B CN102534181B CN201210020782.6A CN201210020782A CN102534181B CN 102534181 B CN102534181 B CN 102534181B CN 201210020782 A CN201210020782 A CN 201210020782A CN 102534181 B CN102534181 B CN 102534181B
- Authority
- CN
- China
- Prior art keywords
- furnace
- bell furnace
- strip
- distribution system
- high temperature
- 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.)
- Active
Links
Images
Abstract
The invention provides a high temperature annealing air distribution system in an orientation silicon steel strip coil bell type furnace, which comprises an air supply pipeline, a water vapor channel and an air return pipeline. The air supply pipeline extends into the inside of the bell type furnace from a centre position of the bottom of the bell type furnace and is lifted to the top of the highest steel strip coil in the bell type furnace, and air outlet through holes are evenly drilled on the pipe wall in the radial direction and the axial direction. Water vapor through holes are arranged on a horizontal bearing support plate body used for bearing each layer of steel strip coils in the bell type furnace, and the air return pipeline is an annular pipeline arranged at the bottom in the furnace close to the inner wall of an outer cover. The air distribution system enables atmosphere in the furnace to be even, and maintains balance of air inlet and air outlet for a long time. When the cover is uncovered, hydrogen in the furnace is exhausted, and the air distribution system eliminates potential safety hazard, prevents steel strip surface to be oxidized, guarantees safety in the furnace, and is high in product quality.
Description
Technical field
The present invention relates to the gas distribution technique of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace, be specifically applied to the high-temperature heat treatment of the oriented silicon steel roll coil of strip in bell furnace, function of dominant technical field of magnetic materials.
Background technology
Oriented silicon steel band is a kind of novel functional magnetic material, because its resistance is large, so in operational process, the electric energy consuming on iron core is little; Because its magnetization has strong directivity, so, magnetic strength in required direction is high, the utilization ratio of iron core is high, and operational efficiency is high, and cold-rolled orientation silicon steel band is the topmost core material of most critical in the electromagnetic oriented conversion products such as transformer, mutual inductor, the production technology level of cold-rolled orientation silicon steel band, be directly connected to the upgrading of a large amount of transformers of country, be directly connected to the utilising efficiency of national energy, sustainable development and the people's lives of it and national economy are closely bound up.According to the Chinese electrical steel industry development annual report > of the < < of electrical steel branch of the Chinese Society for Metals 2010 >, disclose, domestic 78.6 ten thousand tons of the oriented silicon steel bands that consume altogether in 2010, wherein import is 23.6 ten thousand tons, import accounts for 30% of domestic total flow, and cold-rolled orientation silicon steel band is the product that national long-range policy is helped.Cold-rolled orientation silicon steel band complex manufacturing, parameter window is narrow, operation process is long, with high content of technology and be described as the artwork in steel products.
The production technique of oriented silicon steel band is:
1. hot rolled coil (raw material): specification be generally thick * wide=(2.0mm-2.5mm) * (1300mm-1350mm), the heavy 20-25 ton of volume, carbon content is 0.03-0.05%, silicon content is 2.8-3.4%, manganese content is 0.05-0.1%, and sulphur content is 0.02-0.03%.
2. pickling: the ferric oxide that removes steel strip surface.
3. once cold rolling: 2.0mm-2.5mm rolls 0.6mm-0.7mm from thickness, conventionally rolls 3-4 passage.
4. process annealing: the internal stress, part decarburization and the Surface Creation silicon-dioxide (SiO that remove once cold rolling
2).
5. secondary cold-rolling: 0.6mm-0.7mm rolls 0.28mm-0.3mm from thickness, conventionally rolls 2-3 passage.
6. decarburizing annealing is coated with magnesium oxide: in steel strip surface, be coated with one deck magnesium oxide sealing coat.
7. high temperature annealing: the high technology temperature of steel band is 1180 ℃, between 1000 ℃-1100 ℃, the silicon-dioxide (SiO generating in steel strip surface in previous process
2) react with the magnesium oxide of steel strip surface painting, in steel strip surface, generated the Magnesium Silicate q-agent (Mg of one deck insulation
2siO
4) bottom.
8. hot drawing annealing japanning: steel strip surface is coated with insullac and steel band stretching and leveling.
9. pack: pack on request.
For reaching various technique objects, the oriented silicon steel roll coil of strip need to carry out above-mentioned high temperature annealing, and its technique is:
1. steel coil strip is heated to 650 ℃-700 ℃ with the temperature rise rate of 50 ℃/h, atmosphere is nitrogen.
2. steel coil strip is incubated at 650 ℃ of-700 ℃ of temperature, and atmosphere is nitrogen and hydrogen mixture.
3. steel coil strip is heated to 1180 ℃-1200 ℃ with the temperature rise rate of 15 ℃/h, atmosphere is nitrogen and hydrogen mixture.
4. steel coil strip is incubated at 1180 ℃ of-1200 ℃ of temperature, and atmosphere is hydrogen.
5. steel coil strip is cooled to 700 ℃ with stove, and atmosphere is nitrogen and hydrogen mixture.
6. steel coil strip continues to be cooled to 300 ℃ with stove, and atmosphere is nitrogen.
7. steel coil strip is come out of the stove and in environment, is cooled to envrionment temperature.
The high temperature annealing of steel coil strip has two kinds of modes, and a kind of is to anneal in annular continuous oven, and a kind of is to anneal in bell furnace.Because bell furnace floor space is little, technology controlling and process is reliably widely used.
For return-air technique as shown in Figure 1, the supporting plate of common steel coil strip and the atmosphere in bell furnace supply return-air process schematic representation for steel coil strip supporting plate form in common bell furnace and the atmosphere in bell furnace:
1. the supporting plate of the steel coil strip in bell furnace is a blind plate.
2. atmosphere is concentrated and is fed from furnace bottom center, from furnace bottom outer rim surrounding, returns back out.
There is following several respects shortcoming in above-mentioned technique:
One. in stove, gas distribution is inhomogeneous.
Because gas part is to concentrate and feed in stove from furnace bottom center, from stove inner bottom part outer rim surrounding, return back out stove, and furnace atmosphere has back pressure, this just cannot guarantee that the atmosphere feeding can arrive furnace roof, again because temperature in stove is very high, and 1180 ℃-1200 ℃ of Gao Shida, at high like this temperature, in stove, be machinery cannot be installed make the atmosphere in stove carry out positive mechanical circulation, therefore, feed atmosphere in stove and will directly walk in the lower place of stove inner height short circuit and enter return-air hole and discharge out of the furnace.
Inhomogeneous due to atmosphere, makes the temperature in stove also inhomogeneous, and this just makes the quality product in stove inconsistent.
Two. there is security risk
Steel coil strip is carried out in the process of pyroprocessing in bell furnace, atmosphere arrangement in stove is: nitrogen-nitrogen and hydrogen mixture-hydrogen-nitrogen and hydrogen mixture-nitrogen, steel coil strip packs in the process heating up after bell furnace, initial to in-furnace nitrogen supply gas, object is before in-furnace nitrogen supply hydrogen gas mixture, and the oxygen in stove is cleaned.Equally, before steel coil strip carries out preparing to open cover after pyroprocessing finishes in bell furnace, to in-furnace nitrogen supply gas, object is that the hydrogen in the nitrogen and hydrogen mixture in stove is clean.But under same situation, nitrogen proportion is than hydrogen weight, by above-mentioned bell furnace for return-air technique, because of after cannot guaranteeing that nitrogen can be fed to furnace roof, cause to pack into the steel coil strip high temperature annealing that carries out high temperature annealing in bell furnace and finishing, when bell furnace is taken off cover, hydrogen is still being gathered on cover top, and at this moment, existing oxygen in cover, as naked light, will explode.
Three. the steam row of coil of strip inside is unclean, affects quality product
Packing the steel coil strip of carrying out high temperature annealing in bell furnace into is the oriented silicon steel roll coil of strip, after steel strip surface has been coated with magnesium oxide (MgO), again it is rolled into coil of strip, when magnesium oxide (MgO) applies, in magnesium oxide (MgO), has added water (H
2o), therefore, though carried out drying and processing after being coated with, still have a large amount of magnesium oxide (MgO) will be hydrolyzed into magnesium hydroxide Mg (OH)
2, steel coil strip is carried out in the process of high temperature annealing after packing bell furnace into, magnesium hydroxide Mg (OH)
2in the time of 350 ℃-450 ℃, will decomposite constitution water, magnesium hydroxide Mg (OH)
2again resolve into magnesium oxide (MgO), and decompose the water generating, must discharge out of the furnace.
But be a blind plate by the supporting plate of above-mentioned steel coil strip, steam because of the formation of steel coil strip interlayer, ratio than bell-type furnace atmosphere is great, the steam of steel coil strip interlayer can not make progress away, and should walk downwards, but nonpassage again downwards, cause steam to gather the interlayer of middle steel coil strip, at high temperature, water makes steel strip surface oxidation, causes quality product to worsen.
Summary of the invention
The gas distribution system that the invention provides high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace, can make furnace atmosphere even, keeps for a long time air inlet and the equilibrium state of giving vent to anger, and prevents steel strip surface oxidation, guarantees security in stove, and quality product is high.
The present invention realizes by following technical scheme:
The gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace, comprise steam line, vapor channel and return-air duct, described steam line stretches into bell furnace inside by bell furnace bottom centre position, and be increased in bell furnace the top of high steel coil strip, the pipe section of steam line in bell furnace, its tube wall is arranged and can be made each layer of steel coil strip in bell furnace accept the duct of giving vent to anger of atmosphere completely, and steam line top is blind hole; Described aqueous vapor passage is for carrying on the horizontal bearing support plate body of every layer of steel coil strip, steam through hole to be set in bell furnace inside; Described return-air duct is to be laid in stove inner bottom part near a circulating line of type furnace outer cover inwall, and on the tube wall of described circulating line, in horizontal radial inner side, evenly cloth drills through hole, and the internal diameter of described return-air duct is greater than the internal diameter of steam line.
The described duct of giving vent to anger is evenly distributed on the radial and axial position of the tube wall of steam line.
The inner hole section that the described duct total sectional area sum of giving vent to anger is less than or equal to steam line amasss.
Described steam through hole is the some elongated slots that are distributed on carrying support plate.
Described elongated slot is to be distributed on the different circumference of carrying support plate.
The length direction of described elongated slot is for carrying support plate radially.
The inner hole section that through hole total sectional area sum on described return-air duct is less than or equal to return-air duct amasss.
Beneficial effect of the present invention is:
1. the atmosphere homogeneous in bell furnace.
2., when bell furnace is taken off cover, the hydrogen in cover is cleaned, and has eliminated potential safety hazard.
3. the steam of guaranteeing steel coil strip interlayer has the passage of vapor pervious downwards, has alleviated the oxidation on steel coil strip surface, has guaranteed the consistent of the quality of product and quality product.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the bell furnace pyroprocessing steel band of prior art
Fig. 2 is the schematic diagram of gas distribution system of the present invention
Fig. 3 is the schematic diagram of one embodiment of the present invention
1-supports inner core, and 2-supports urceolus, 3-stove outer cover, and 4-muffler, 5-base, 6-steam line, the 601-duct of giving vent to anger, 7-carries support plate, 701-elongated slot, the 8-oriented silicon steel roll coil of strip;
I-elongated slot width.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As Fig. 2, be the schematic diagram of gas distribution system of the present invention, comprise steam line 6, vapor channel and return-air duct.
In stove, upper, middle and lower fill the oriented silicon steel roll coil of strip 8 coil of strips totally three volumes.Steam line 6 stretches into bell furnace inside by bell furnace bottom centre position, and is increased to the upper surface of going up a coil band in bell furnace most.The pipe section of steam line in bell furnace, its tube wall radial and axial all evenly ground auger cloth go out vent hole 601, pipeline top is blind hole.The pipe section of steam line in bell furnace, it is long-pending that on its tube wall, the through hole total sectional area sum of giving vent to anger of the cloth that bores is less than or equal to the inner hole section of steam line.The material of steam line is Cr
25ni
35.
Aqueous vapor passage is for carrying on the horizontal bearing support plate body 7 of every layer of steel coil strip 8, steam through hole to be set in bell furnace inside.Steam through hole is the some elongated slots 701 that are distributed on carrying support plate.Elongated slot is to be distributed on the different circumference of carrying support plate, and between adjacent two elongated slots that distribute on same circumference, the distance of arc length is between 600～800mm.The width I of elongated slot is between 10～30mm.The length direction of elongated slot is for carrying support plate radially.
Return-air duct 4 is to be laid in stove inner bottom part near a circulating line of outer cover inwall.On the tube wall of circulating line, in horizontal radial inner side, the uniform hole that drills through, the inner hole section that through hole total sectional area sum is less than or equal to return-air duct amasss, and the internal diameter of return-air duct is greater than the internal diameter of steam line.
The material of return-air duct is Cr
25ni
35.
Below in conjunction with Fig. 3 and embodiment, the present invention will be further described.As Fig. 3, be the schematic diagram of one embodiment of the present invention, the dash area of carrying support plate is the oriented silicon steel roll coil of strip and the contact part of carrying support plate.
The following processing step of concrete employing:
(1), in bell furnace, the loading capacity of the oriented silicon steel roll coil of strip is 3 volumes.
(2), in the stove of bell furnace, in the stove of processing atmosphere steam line, total length is 2500mm.
(3), in the stove of bell furnace, the material of processing atmosphere steam line is Cr
25ni
35.
(4), in the stove of bell furnace, the specification of processing atmosphere steam line is ￠ 25mm * 2.0mm.
(5), processing atmosphere steam line axially sets out pore road every 100mm two ends in same diametric(al) in the stove of bell furnace, axially the radially angle in the neighbouring duct of giving vent to anger is 180 ℃.
(6), in the stove of bell furnace, processing atmosphere steam line top is blind hole.
(7), in the stove of bell furnace, on processing atmosphere air-supply duct, the pore road of outputing is ￠ 3.0mm.
(8), open 14 elongated slots on the carrying support plate of steel coil strip, on same circumference the distance between adjacent two elongated slots at the 800mm two ends of arc length distance.
(9), the length of elongated slot is 200mm, elongated slot through hole be distributed as radially three rows, it is all uniform on its circumference that 14 elongated slots of the present embodiment can reach every row.
(10), the width of elongated slot through hole is 20mm.
(11), the length direction of elongated slot through hole is for carrying support plate radially.
The following processing step of concrete employing:
(1), in bell furnace, the loading capacity of the oriented silicon steel roll coil of strip is 1 volume.
(2), in the stove of bell furnace, in the stove of processing atmosphere steam line, total length is 850mm.
(3), in the stove of bell furnace, the material of processing atmosphere steam line is Cr
25ni
35.
(4), in the stove of bell furnace, the specification of processing atmosphere steam line is ￠ 8mm * 1.0mm.
(5), processing atmosphere steam line axially sets out pore road every 30mm two ends in same diametric(al) in the stove of bell furnace, axially the radially angle in the neighbouring duct of giving vent to anger is 180 ℃.
(6), in the stove of bell furnace, processing atmosphere steam line top is blind hole.
(7), in the stove of bell furnace, on processing atmosphere air-supply duct, the pore road of outputing is ￠ 1.0mm.
(8), open 14 elongated slots on the carrying support plate of steel coil strip, on same circumference the distance between adjacent two elongated slots at the 600mm two ends of arc length distance.
(9), the length of elongated slot is 200mm, elongated slot through hole be distributed as radially three rows, it is all uniform on its circumference that 14 elongated slots of the present embodiment can reach every row.
(10), the width of elongated slot through hole is 10mm.
(11), the length direction of elongated slot through hole is for carrying support plate radially.
The following processing step of concrete employing:
(1), in bell furnace, the loading capacity of the oriented silicon steel roll coil of strip is 2 volumes.
(2), in the stove of bell furnace, in the stove of processing atmosphere steam line, total length is 1300mm.
(3), in the stove of bell furnace, the material of processing atmosphere steam line is Cr
25ni
35.
(4), in the stove of bell furnace, the specification of processing atmosphere steam line is ￠ 12mm * 2.0mm.
(5), processing atmosphere steam line axially sets out pore road every 65mm two ends in same diametric(al) in the stove of bell furnace, axially the radially angle in the neighbouring duct of giving vent to anger is 180 ℃.
(6), in the stove of bell furnace, processing atmosphere steam line top is blind hole.
(7), in the stove of bell furnace, on processing atmosphere air-supply duct, the pore road of outputing is ￠ 2.0mm.
(8), open 14 elongated slots on the carrying support plate of steel coil strip, on same circumference the distance between adjacent two elongated slots at the 700mm two ends of arc length distance.
(9), the length of elongated slot is 200mm, elongated slot through hole be distributed as radially three rows, it is all uniform on its circumference that 14 elongated slots of the present embodiment can reach every row.
(10), the width of elongated slot through hole is 20mm.
(11), the length direction of elongated slot through hole is for carrying support plate radially.
Claims (4)
1. the gas distribution system of high temperature annealing in an oriented silicon steel roll coil of strip bell furnace, comprise steam line, vapor channel and return-air duct, it is characterized in that described steam line stretches into bell furnace inside by bell furnace bottom centre position, and be increased in bell furnace the top of high steel coil strip, the pipe section of steam line in bell furnace, its tube wall is arranged and can be made each layer of steel coil strip in bell furnace accept the duct of giving vent to anger of atmosphere completely, and steam line top is blind hole; Described vapor channel is for carrying on the horizontal bearing support plate body of every layer of steel coil strip, steam through hole to be set in bell furnace inside; Described return-air duct is to be laid in stove inner bottom part near a circulating line of type furnace outer cover inwall, and on the tube wall of described circulating line, in horizontal radial inner side, evenly cloth drills through hole, and the internal diameter of described return-air duct is greater than the internal diameter of steam line, wherein:
The inner hole section that the described duct total sectional area sum of giving vent to anger is less than or equal to steam line amasss;
The inner hole section that through hole total sectional area sum on described return-air duct is less than or equal to return-air duct amasss.
2. the gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace as claimed in claim 1, is characterized in that described steam through hole is the some elongated slots that are distributed on carrying support plate.
3. the gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace as claimed in claim 2, is characterized in that described elongated slot is to be distributed on the different circumference of carrying support plate.
4. the gas distribution system of high temperature annealing in a kind of oriented silicon steel roll coil of strip bell furnace as claimed in claim 2 or claim 3, the length direction that it is characterized in that described elongated slot for carrying support plate radially.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210020782.6A CN102534181B (en) | 2012-01-30 | 2012-01-30 | High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210020782.6A CN102534181B (en) | 2012-01-30 | 2012-01-30 | High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102534181A CN102534181A (en) | 2012-07-04 |
| CN102534181B true CN102534181B (en) | 2014-01-29 |
Family
ID=46342200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210020782.6A Active CN102534181B (en) | 2012-01-30 | 2012-01-30 | High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102534181B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018715B (en) * | 2015-08-24 | 2017-03-08 | 武汉富瑞能源科技有限公司 | Horizontal bell furnace |
| CN106011452B (en) * | 2016-07-09 | 2023-02-10 | 新万鑫（福建）精密薄板有限公司 | Device and method for controlling air pressure in oriented silicon steel high-temperature bell-type furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475369A (en) * | 1982-08-18 | 1984-10-09 | Sumitomo Metal Industries, Ltd. | Method for producing clean cold strip |
| CN102016420A (en) * | 2008-07-07 | 2011-04-13 | 钢铁普蓝特克股份有限公司 | Radiant tube burner device and heat storing element unit capable of being mounted to radiant tube burner |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0428823A (en) * | 1990-05-25 | 1992-01-31 | Sumitomo Metal Ind Ltd | Method for annealing high carbon steel strip |
| JPH06108164A (en) * | 1992-09-25 | 1994-04-19 | Sumitomo Metal Ind Ltd | Method for cooling annealed coil |
-
2012
- 2012-01-30 CN CN201210020782.6A patent/CN102534181B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475369A (en) * | 1982-08-18 | 1984-10-09 | Sumitomo Metal Industries, Ltd. | Method for producing clean cold strip |
| CN102016420A (en) * | 2008-07-07 | 2011-04-13 | 钢铁普蓝特克股份有限公司 | Radiant tube burner device and heat storing element unit capable of being mounted to radiant tube burner |
Non-Patent Citations (2)
| Title |
|---|
| JP平4-28823A 1992.01.31 |
| JP特开平6-108164A 1994.04.19 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102534181A (en) | 2012-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102534181B (en) | High temperature annealing air distribution system in orientation silicon steel strip coil bell type furnace | |
| CN102297583B (en) | Steam oxidation well furnace | |
| CN108884506B (en) | Method and furnace arrangement for heat treatment of metal strip | |
| CN206428285U (en) | A kind of wire strands annealing device | |
| CN108517395A (en) | A kind of cold rolling non-oriented electrical steel band and preparation method thereof | |
| CN102395852A (en) | High-temperature furnace for annealing sheet metal packets | |
| CN105074021A (en) | Continuous annealing device and continuous hot-dip galvanising device for steel strip | |
| CN206207993U (en) | Multifunctional box resistance furnace | |
| CN103882191A (en) | Annealing method for total nitrogen produced cold-rolled non-oriented electrical steel | |
| CN203513286U (en) | Oxygen-heating-process calcium carbide furnace | |
| CN202177295U (en) | Steam oxidizing pit furnace | |
| CN103882193A (en) | Annealing method of external layer-oxidized cold-rolled non-oriented electrical steel | |
| CN110343830B (en) | Steel strip preheating device and method for reducing strip breakage rate of oriented silicon steel strip | |
| CN215328254U (en) | Heat treatment device for copper-plated steel strip | |
| CN203784967U (en) | Preheating type exhaust gasincinerator for organic exhaust gases | |
| CN102243017B (en) | Extra-large chain-disc-type microwave continuous roasting furnace | |
| CN1944688A (en) | Heat insulation type multifunction ionic thermal processing device | |
| CN201704388U (en) | Intermediate frequency induction shaft furnace special for preparing vanadium-nitrogen alloy | |
| CN204690074U (en) | A kind of electrical steel annealing heating device | |
| CN101591763B (en) | Insulating type multifunctional ion chemical heat treatment device | |
| CN110369496B (en) | Cold rolling preheating method for high-grade non-oriented silicon steel | |
| CN204939531U (en) | A kind of electromagnetic induction furnace for heat-treating amorphous & nanocrystalline | |
| CN106672971A (en) | Electrode type calcium carbide furnace | |
| CN202582163U (en) | Heat-insulating energy-saving rotary kiln roller | |
| CN110369500A (en) | A kind of disconnected band control method of oriented silicon steel cold-rolled |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 214400, Jiangsu Huishan Wuxi Economic Development Zone Qian Qiao supporting area (Creek Village) Applicant after: WUXI HUAJING NEW MATERIAL Co.,Ltd. Address before: 214400, Jiangsu Huishan Wuxi Economic Development Zone Qian Qiao supporting area (Creek Village) Applicant before: Wuxi Huajin New Material Co.,Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Gas Distribution System for High Temperature Annealing of Oriented Silicon Steel Strip in a Bell Furnace Effective date of registration: 20230315 Granted publication date: 20140129 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi Huishan branch Pledgor: WUXI HUAJING NEW MATERIAL Co.,Ltd. Registration number: Y2023980034890 |