CN108676997A - The lookup method of impression defect generation position in vertical continuous annealing furnace stove - Google Patents
The lookup method of impression defect generation position in vertical continuous annealing furnace stove Download PDFInfo
- Publication number
- CN108676997A CN108676997A CN201810488843.9A CN201810488843A CN108676997A CN 108676997 A CN108676997 A CN 108676997A CN 201810488843 A CN201810488843 A CN 201810488843A CN 108676997 A CN108676997 A CN 108676997A
- Authority
- CN
- China
- Prior art keywords
- annealing furnace
- stove
- continuous annealing
- vertical continuous
- impression
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a kind of lookup methods of impression defect generation position in vertical continuous annealing furnace stove, including step：S1, prepare inspection coiled material；S2, vertical continuous annealing furnace are started to work, and inspection coiled material is passed through vertical continuous annealing furnace；S3, by observe vertical continuous annealing furnace exit belt steel surface impression defect, judge the shutdown opportunity of vertical continuous annealing furnace；S4, enter the furnace roller that stove checks vertical continuous annealing furnace.The lookup method of impression defect generation position in vertical continuous annealing furnace stove of the present invention, impression defect generation position in annealing furnace can be directed to quickly to be searched, improve the search efficiency of impression defect generation position in stove, improve the accuracy that stove searches impression defect generation position in stove, reduce the losses such as product degradation caused by strip impression mass defect in stove, reduce simultaneously and search the time, a large amount of time has been saved to the labour maintenance of the stoves such as follow-up roll change.
Description
Technical field
The invention belongs to annealing furnace technical fields, specifically, the present invention relates to a kind of vertical continuous annealing furnace stove internal pressures
The lookup method of trace defect generation position.
Background technology
The furnace roller of existing vertical continuous annealing furnace can make in stove belt steel surface generate impression defect, strip impression defect in stove
Very much, several situations, these defects such as " ram's horn prints ", " explosion spot " and " point " mainly annoying most strips so far
Continuous annealing production line seriously affects the surface quality of strip especially automobile exterior panel, causes product because surface quality reduces, damage
Lose position very big, therefore that internal pressure trace defect generation of coming out of the stove need to be searched.Vertical continuous annealing furnace has 115 furnace rollers, quantity online
Greatly, a large amount of production time is occupied by the artificial lookup furnace roller of blow-on, and because seeking scope is wide, security risk is big
And in stove impression defect generation position lookup accuracy it is low.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, the present invention provides a kind of stand
The lookup method of impression defect generation position in formula continuous annealing furnace stove, it is therefore an objective to improve looking into for impression defect generation position in stove
Look for efficiency.
To achieve the goals above, the technical solution that the present invention takes is：Impression defect is produced in vertical continuous annealing furnace stove
The lookup method of raw position, including step：
S1, prepare inspection coiled material；
S2, vertical continuous annealing furnace are started to work, and inspection coiled material is passed through vertical continuous annealing furnace；
S3, exit by observing vertical continuous annealing furnace belt steel surface impression defect, judge vertical continuously to move back
The shutdown opportunity of stove；
S4, enter the furnace roller that stove checks vertical continuous annealing furnace.
In the step S1, the strip of inspection coiled material is the mild steel of thickness >=1.2mm, the strip of inspection coiled material
Width >=1250mm.
In the step S2, during inspection coiled material is by vertical continuous annealing furnace, strip wire velocity control exists
Between 120-180m/min.
In the step S3, when observing that the belt steel surface in the exit of vertical continuous annealing furnace has apparent impression defect
When, it can determine whether that apparent impression defect has occurred in belt steel surface in stove at this time, be ready for starting and stop and shut down cooling soon
Program.
In the step S3, when vertical continuous annealing furnace is shut down, stops being passed through hydrogen into stove first, work as furnace temperature
When reaching that hydrogen content reaches setting value in the first setting value and stove, annealing furnace starts to cool down；When furnace temperature reaches the second setting value
When, stop being passed through coal gas into stove；When furnace temperature reaches third setting value, the head cover and bottom cover of vertical continuous annealing furnace are opened.
When furnace temperature reaches hydrogen content ＜ 0.5% in the first setting value and stove, annealing furnace just starts to cool down.
First setting value is 500 DEG C, and second setting value is not more than 300 DEG C, and the third setting value is not more than
200℃。
In the step S4, enter the position that stove checks belt steel surface impression defect first, then checks and sent out with belt steel surface
The roll surface of the furnace roller of raw contact, it is final to search internal pressure trace defect generation position of coming out of the stove.
In the step S3, when observing that the belt steel surface in the exit of vertical continuous annealing furnace has apparent impression defect
When, belt steel surface impression defect position is recorded, and the position is set as the first defective locations；In the step S4, enter stove
Behind the position for checking belt steel surface impression defect, belt steel surface impression defect position in stove is recorded, and the position is set as
Second defective locations；According to the distance between the first defective locations and the second defective locations, judge that impression lacks in the stove found out
Fall into whether corresponding furnace roller at generation position is impression defect generation position in correct stove.
The lookup method of impression defect generation position in vertical continuous annealing furnace stove of the present invention can be directed to annealing furnace internal pressure
Trace defect generation position is quickly searched, and is improved the search efficiency of impression defect generation position in stove, is improved and looked into stove
The accuracy of impression defect generation position in stove is looked for, the damages such as product degradation caused by strip impression mass defect in stove are reduced
It loses, while reducing and searching the time, a large amount of time has been saved to the labour maintenance of the stoves such as follow-up roll change.
Specific implementation mode
Below by the description to embodiment, specific embodiments of the present invention will be described in further detail, purpose
Be to aid in those skilled in the art has more complete, accurate and deep understanding to the inventive concept of the present invention, technical solution, and
Contribute to its implementation.
The present invention provides a kind of lookup method of impression defect generation position in vertical continuous annealing furnace stove, including it is as follows
The step of：
S1, prepare inspection coiled material；
S2, vertical continuous annealing furnace are started to work, and inspection coiled material is passed through vertical continuous annealing furnace；
S3, exit by observing vertical continuous annealing furnace belt steel surface impression defect, judge vertical continuously to move back
The shutdown opportunity of stove；
S4, enter the furnace roller that stove checks vertical continuous annealing furnace.
Specifically, the impression defect generated on strip in annealing furnace mainly has " ram's horn print ", " explosion spot " and " fiber crops
Several situations such as point ", impression defect are generated in stove are primarily due to the furnace roller of vertical continuous annealing furnace and produce defect on strip,
Therefore the generation position for searching internal pressure trace defect of coming out of the stove is exactly the furnace roller for the generation defect for finding out vertical continuous annealing furnace.
In above-mentioned steps S1, the strip of inspection coiled material is the mild steel of thickness >=1.2mm, the strip of inspection coiled material
Width >=1250mm, mild steel hardness is low, easy tos produce impression, and the exit subsequently in annealing furnace is contributed to observe the pressure on strip
Trace defect, it is ensured that the accuracy of lookup result.Inspection prepares 3-5 volumes with coiled material, and the steel grade group of inspection coiled material is
The trade mark of MBTRG00301 or MBTRG00502, inspection coiled material select IF deep punching steels (generally DC04 or DC06).
In above-mentioned steps S2, when vertical continuous annealing furnace is run, the annealing temperature of vertical continuous annealing furnace is set as 830
℃.During inspection coiled material is by vertical continuous annealing furnace, strip wire velocity control is opened between 120-180m/min
Power is to be slightly above the setting of two level tension 20%.Strip linear velocity is preferably 170m/min, convenient for subsequently in the exit of annealing furnace
The impression defect on strip is observed, search efficiency is improved.
In above-mentioned steps S2, the light and heavy degree of conjunction outlet horizon check platform belt steel surface impression defect, not such as defect
Strip tension can be obviously stepped up, is promoted be no more than 10% every time, be the upper limit with 50%.
In above-mentioned steps S3, when observe the belt steel surface in the exit of vertical continuous annealing furnace have apparent impression lack
It when falling into, can determine whether that apparent impression defect has occurred in belt steel surface in stove at this time, be ready for starting and stop and shut down drop soon
Warm program.
In above-mentioned steps S3, when vertical continuous annealing furnace is shut down, stops being passed through hydrogen into stove first, work as stove
When temperature reaches that hydrogen content reaches setting value in the first setting value and stove, annealing furnace starts to cool down；When furnace temperature reaches the second setting
When value, stop being passed through coal gas into stove；When furnace temperature reaches third setting value, the top lid and bottom of vertical continuous annealing furnace are opened
Lid.
Preferably, when furnace temperature reaches hydrogen content ＜ 0.5% in the first setting value and stove, annealing furnace just starts to drop
Temperature.First setting value is 500 DEG C, and the second setting value is not more than 300 DEG C, and third setting value is not more than 200 DEG C.Namely above-mentioned
In step S3, stop being passed through hydrogen into stove first, carries out safety purge, and close electric radiant tube；When furnace temperature reach 500 DEG C and
In stove when hydrogen content ＜ 0.5%, annealing furnace could start to cool down to set temperature；When furnace temperature is less than 300 DEG C, close
Gas switch stops being passed through coal gas into stove；Close each circulating fan, combustion fan, drying air fan, furnace chamber purging completion；When
When furnace temperature is less than 200 DEG C, the head cover and bottom cover of vertical continuous annealing furnace is opened, and in this process, is first to open head cover,
Then bottom cover is opened again.In step s3, by the control to furnace temperature and sequence of uncapping, it can prevent belt steel surface when blow-on from producing
Raw oxidation tint and the accuracy for interfering Defect Search.
In above-mentioned steps S4, enter the position that stove checks belt steel surface impression defect first, then inspection and belt steel surface
The roll surface for the furnace roller being in contact, it is final to search internal pressure trace defect generation position of coming out of the stove.
In above-mentioned steps S3, when observe the belt steel surface in the exit of vertical continuous annealing furnace have apparent impression lack
When falling into, belt steel surface impression defect position is recorded, and the position is set as the first defective locations, the first defect on strip
Position is located at the exit of vertical continuous annealing furnace；In above-mentioned steps S4, enter the position that stove checks belt steel surface impression defect
Afterwards, belt steel surface impression defect position in stove is recorded, and the position is set as the second defective locations, second on strip lacks
Fall into the inside that position is located at vertical continuous annealing furnace.In above-mentioned steps S4, after finding impression defect on strip in stove, at once
The roll surface for the furnace roller that investigation nearby contacts searches the defective furnace roller where internal pressure trace defect generation position of coming out of the stove.Most
Afterwards, according to the distance between the first defective locations and the second defective locations, judge impression defect generation position in the stove found out
Locate whether corresponding furnace roller is impression defect generation position in correct stove, it is ensured that the accuracy of lookup result.
Above-mentioned lookup method can be directed to impression defect generation position in annealing furnace and quickly be searched, and improve stove internal pressure
The search efficiency of trace defect generation position improves the accuracy that stove searches impression defect generation position in stove, reduces because of stove
The losses such as product degradation caused by interior strip impression mass defect, while reducing and searching the time, give the labour inspection of the stoves such as follow-up roll change
It repaiies and has saved a large amount of time.
The present invention is exemplarily described above.Obviously, present invention specific implementation is not subject to the restrictions described above.
As long as using the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or it is not improved, it will
The above-mentioned design and technical solution of the present invention directly applies to other occasions, within protection scope of the present invention.
Claims (9)
1. the lookup method of impression defect generation position in vertical continuous annealing furnace stove, which is characterized in that including step：
S1, prepare inspection coiled material；
S2, vertical continuous annealing furnace are started to work, and inspection coiled material is passed through vertical continuous annealing furnace；
S3, by observe vertical continuous annealing furnace exit belt steel surface impression defect, judge vertical continuous annealing furnace
Shutdown opportunity；
S4, enter the furnace roller that stove checks vertical continuous annealing furnace.
2. the lookup method of impression defect generation position, feature in vertical continuous annealing furnace stove according to claim 1
It is, in the step S1, the strip of inspection coiled material is the mild steel of thickness >=1.2mm, the strip of inspection coiled material
Width >=1250mm.
3. the lookup method of impression defect generation position in vertical continuous annealing furnace stove according to claim 1 or 2, special
Sign is, in the step S2, during inspection coiled material is by vertical continuous annealing furnace, strip wire velocity control is in 120-
Between 180m/min.
4. the lookup method of impression defect generation position in vertical continuous annealing furnace stove according to any one of claims 1 to 3,
It is characterized in that, in the step S3, when observing that the belt steel surface in the exit of vertical continuous annealing furnace has apparent impression
It when defect, can determine whether that apparent impression defect has occurred in belt steel surface in stove at this time, be ready for starting and stop and shut down soon
Cooling process.
5. the lookup method of impression defect generation position, feature in vertical continuous annealing furnace stove according to claim 4
It is, in the step S3, when vertical continuous annealing furnace is shut down, stops being passed through hydrogen into stove first, when furnace temperature reaches
When hydrogen content reaches setting value in the first setting value and stove, annealing furnace starts to cool down；When furnace temperature reaches the second setting value,
Stop being passed through coal gas into stove；When furnace temperature reaches third setting value, the head cover and bottom cover of vertical continuous annealing furnace are opened.
6. the lookup method of impression defect generation position, feature in vertical continuous annealing furnace stove according to claim 5
It is, when furnace temperature reaches hydrogen content ＜ 0.5% in the first setting value and stove, annealing furnace just starts to cool down.
7. the lookup method of impression defect generation position, feature in vertical continuous annealing furnace stove according to claim 5
It is, first setting value is 500 DEG C, and second setting value is not more than 300 DEG C, and the third setting value is not more than 200
℃。
8. according to the lookup method of impression defect generation position in claim 47 any vertical continuous annealing furnace stoves,
It is characterized in that, in the step S4, enter the position that stove checks belt steel surface impression defect first, then inspection and belt steel surface
The roll surface for the furnace roller being in contact, it is final to search internal pressure trace defect generation position of coming out of the stove.
9. the lookup method of impression defect generation position, feature in vertical continuous annealing furnace stove according to claim 8
It is, in the step S3, when observing that the belt steel surface in the exit of vertical continuous annealing furnace has apparent impression defect,
Belt steel surface impression defect position is recorded, and the position is set as the first defective locations；In the step S4, enter stove inspection
Behind the position of belt steel surface impression defect, belt steel surface impression defect position in stove is recorded, and the position is set as second
Defective locations；According to the distance between the first defective locations and the second defective locations, judge that impression defect is produced in the stove found out
Whether corresponding furnace roller is impression defect generation position in correct stove at raw position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810488843.9A CN108676997B (en) | 2018-05-21 | 2018-05-21 | Method for searching position of indentation defect generation in vertical continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810488843.9A CN108676997B (en) | 2018-05-21 | 2018-05-21 | Method for searching position of indentation defect generation in vertical continuous annealing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108676997A true CN108676997A (en) | 2018-10-19 |
| CN108676997B CN108676997B (en) | 2020-02-07 |
Family
ID=63807056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810488843.9A Active CN108676997B (en) | 2018-05-21 | 2018-05-21 | Method for searching position of indentation defect generation in vertical continuous annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108676997B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724812A (en) * | 2019-10-10 | 2020-01-24 | 邯郸钢铁集团有限责任公司 | Method for eliminating furnace roller indentation defect of continuous annealing furnace |
| CN116609493A (en) * | 2023-07-21 | 2023-08-18 | 宁德时代新能源科技股份有限公司 | Indentation detection method, laminated cell manufacturing method and device and electronic equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040063018A (en) * | 2003-01-04 | 2004-07-12 | 윤명중 | The manufacturing method of cold rolled steel sheet without surface ghost line defect for automobile |
| CN101906529A (en) * | 2009-06-08 | 2010-12-08 | 鞍钢股份有限公司 | Method for controlling and treating bottom roller dross of carbon sleeve furnace |
| CN102560071A (en) * | 2012-01-16 | 2012-07-11 | 美钢联工程技术股份有限公司 | Method for grinding hearth roll of continuous annealing unit on line |
| CN102828014A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Method for controlling nodulation of carbon blind hearth roller |
| CN103322824A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Treating method of furnace roller nodule |
| CN103924058A (en) * | 2013-12-14 | 2014-07-16 | 河北首钢燕郊机械有限责任公司 | Method for cleaning nodulations on furnace roller of cold-rolled plate continuous annealing furnace |
| CN104212952A (en) * | 2013-06-03 | 2014-12-17 | 上海梅山钢铁股份有限公司 | Subsection blowing control method of atmosphere in vertical continuous annealing furnace |
| CN107630135A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of method for alleviating furnace roller dross degree and the post processing of furnace roller dross |
-
2018
- 2018-05-21 CN CN201810488843.9A patent/CN108676997B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040063018A (en) * | 2003-01-04 | 2004-07-12 | 윤명중 | The manufacturing method of cold rolled steel sheet without surface ghost line defect for automobile |
| CN101906529A (en) * | 2009-06-08 | 2010-12-08 | 鞍钢股份有限公司 | Method for controlling and treating bottom roller dross of carbon sleeve furnace |
| CN102560071A (en) * | 2012-01-16 | 2012-07-11 | 美钢联工程技术股份有限公司 | Method for grinding hearth roll of continuous annealing unit on line |
| CN103322824A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Treating method of furnace roller nodule |
| CN102828014A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Method for controlling nodulation of carbon blind hearth roller |
| CN104212952A (en) * | 2013-06-03 | 2014-12-17 | 上海梅山钢铁股份有限公司 | Subsection blowing control method of atmosphere in vertical continuous annealing furnace |
| CN103924058A (en) * | 2013-12-14 | 2014-07-16 | 河北首钢燕郊机械有限责任公司 | Method for cleaning nodulations on furnace roller of cold-rolled plate continuous annealing furnace |
| CN107630135A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of method for alleviating furnace roller dross degree and the post processing of furnace roller dross |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724812A (en) * | 2019-10-10 | 2020-01-24 | 邯郸钢铁集团有限责任公司 | Method for eliminating furnace roller indentation defect of continuous annealing furnace |
| CN110724812B (en) * | 2019-10-10 | 2021-03-09 | 邯郸钢铁集团有限责任公司 | Method for eliminating furnace roller indentation defect of continuous annealing furnace |
| CN116609493A (en) * | 2023-07-21 | 2023-08-18 | 宁德时代新能源科技股份有限公司 | Indentation detection method, laminated cell manufacturing method and device and electronic equipment |
| CN116609493B (en) * | 2023-07-21 | 2023-09-22 | 宁德时代新能源科技股份有限公司 | Indentation detection method, laminated cell manufacturing method and device and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108676997B (en) | 2020-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108676997A (en) | The lookup method of impression defect generation position in vertical continuous annealing furnace stove | |
| CN103276191B (en) | Purge method for annealing of low-carbon cold-roll steel sheets | |
| JP2505841B2 (en) | Method for producing non-aged fused zinc matt strips | |
| CN110788513B (en) | Production method for improving wire feeding stability of wire-welded steel | |
| WO2009037982A1 (en) | Process for producing hot briquette iron using high-temperature reduced iron, and method and apparatus for temperature control of reduced iron for hot forming for the process | |
| CN102492813B (en) | Production technology of stainless steel band for weaving reed | |
| CN108220566A (en) | Compact fine grain high-strength plate output strip line flexible manufacturing method | |
| CN110157891A (en) | Ultra-thin stainless steel band TA annealing process | |
| US2666003A (en) | Treating strip | |
| KR20120054001A (en) | Apparatus for manufacturing cold rolled stainless coil by semi-sequential way | |
| US2402013A (en) | Annealing method | |
| CN110724812B (en) | Method for eliminating furnace roller indentation defect of continuous annealing furnace | |
| CN101892366B (en) | Low oxygen content and low nitrogen consumption control system and method for radiant tube-heated non-oxidation roller hearth furnace | |
| US20110048591A1 (en) | Method for heat treating a rolling stock made of a heat-treatable aluminum alloy | |
| CN106119477A (en) | Reducing atmosphere method for building up and continuous annealing process for continuous annealing process | |
| CN111558615B (en) | Method for controlling finish rolling pressure of titanium plate on hot continuous rolling line | |
| RU2354719C2 (en) | Annealing method of low-carbon sheet steel | |
| CN110643805B (en) | Furnace chamber atmosphere fluctuation pressurization replacement method for continuous annealing furnace | |
| CN109797271B (en) | Method for quickly producing continuous annealing furnace again | |
| CN113699365A (en) | Method for improving oxidation color defect of steel coil after cover annealing | |
| CN105969952A (en) | Annealing process for assembling bolt for automobile frame | |
| CN110129705A (en) | A kind of continuous zinc/aluminium/aluminium zinc coating silicon unit machine control method | |
| CN104406809B (en) | A kind of method of high temperature fast sampling after strip coiled material heat treatment | |
| CN210442332U (en) | Environment-friendly PET and PVC plastic products recognition device | |
| CN214441859U (en) | Hot rolling stainless steel strip steel lower surface defect detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 Intellectual Property Department, Technical Center No. 8, Hunan West Road, Yushan District, Ma'anshan City, Anhui Province Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |