CN110883092A - Method for controlling thickness fluctuation of silicon steel - Google Patents
Method for controlling thickness fluctuation of silicon steel Download PDFInfo
- Publication number
- CN110883092A CN110883092A CN201911202036.7A CN201911202036A CN110883092A CN 110883092 A CN110883092 A CN 110883092A CN 201911202036 A CN201911202036 A CN 201911202036A CN 110883092 A CN110883092 A CN 110883092A
- Authority
- CN
- China
- Prior art keywords
- acid
- silicon steel
- controlling
- controlled
- thickness
- 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.)
- Pending
Links
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 67
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000005554 pickling Methods 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims abstract description 14
- 238000005406 washing Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000002360 preparation method Methods 0.000 claims abstract description 3
- 238000004140 cleaning Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000000137 annealing Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 5
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 4
- 241001085205 Prenanthella exigua Species 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/02—Tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a method for controlling thickness fluctuation of silicon steel, which comprises the steps of blank preparation, hot rolling, acid washing, cooling, coiling and finishing, wherein the hot rolling coiling temperature is controlled to be 650-680 ℃, the speed of the silicon steel in an acid washing section is 2.8-3.1m/s, the acid liquor concentrations in acid tanks 1, 2 and 3 of the acid washing section are 65-95 g/L, 85-125 g/L and 130-160g/L respectively, the acid liquor temperatures in acid tanks 1, 2 and 3 are 75-95 ℃, and the roughness of a working roll of a stand 1 of acid rolling is 1.25-1.40 mu m; controlling the elongation of the scale breaking withdrawal and straightening of the pickling section to be 1.3-1.6 percent and the tension of the scale breaking withdrawal and straightening machine to be 110-125 kN. According to the invention, the coiling temperature of the hot rolled silicon steel is reduced, and iron oxide on the surface of the strip steel is reduced, so that the pickling effect is improved, and the purpose of reducing the thickness fluctuation of the silicon steel is achieved.
Description
Technical Field
The invention relates to the technical field of silicon steel production processes, in particular to a method for controlling thickness fluctuation of silicon steel.
Background
The silicon steel thickness precision control (same plate difference) is one of important indexes for measuring the quality of the cold-rolled non-oriented silicon steel, on one hand, the uniform thickness control is favorable for improving the stacking coefficient of silicon steel sheets, and the lamination coefficient is reduced by 1 percent, namely the iron loss is increased by 2 percent, the magnetic induction is reduced by 1 percent, and the magnetic performance of the silicon steel sheets is indirectly influenced; on the other hand, the production efficiency of the downstream process is directly influenced by the control of the same-plate difference of the silicon steel. With the implementation of the national policy of energy conservation and environmental protection and the upgrading and upgrading of electric products, the market will have more and more strict requirements on the performance of non-oriented silicon steel, so that the optimization of the thickness fluctuation control of the silicon steel is very necessary.
Disclosure of Invention
In order to solve the problem of improving the performance of non-oriented silicon steel, the invention provides a method for controlling the thickness fluctuation of silicon steel, which reduces the iron oxide on the surface of strip steel by reducing the coiling temperature of hot-rolled silicon steel, thereby improving the pickling effect and achieving the purpose of reducing the thickness fluctuation of the silicon steel, and the technical scheme is as follows:
a method for controlling thickness fluctuation of silicon steel comprises the steps of blank preparation, hot rolling, acid cleaning, cooling, coiling and finishing, wherein the hot rolling coiling temperature is controlled to be 650-680 ℃, the speed of the silicon steel in an acid cleaning section is 2.8-3.1m/s, the acid liquor concentrations in acid tanks 1, 2 and 3 of the acid cleaning section are 65-95 g/L, 85-125 g/L and 130-160g/L respectively, the acid liquor temperatures in acid tanks 1, 2 and 3 are 75-95 ℃, and the roughness of a working roll of a stand 1 of the acid rolling is 1.25-1.40 mu m; controlling the elongation of the scale breaking withdrawal and straightening of the pickling section to be 1.3-1.6 percent and the tension of the scale breaking withdrawal and straightening machine to be 110-125 kN.
Preferably, the hot rolling coiling temperature is controlled at 650-670 ℃.
Preferably, the speed of the silicon steel in the pickling section is controlled to be 3 m/s.
Preferably, the scale breaking withdrawal and straightening elongation of the pickling section is controlled to be 1.5%, and the tension of the scale breaking withdrawal and straightening machine is controlled to be 120 kN.
Preferably, the acid liquor concentrations in the acid tanks No. 1, No. 2 and No. 3 of the acid washing section are respectively controlled to be 75-95 g/L, 105-125 g/L and 130-140g/L, and the acid liquor temperatures in the acid tanks No. 1, No. 2 and No. 3 are controlled to be 78-89 ℃.
Preferably, the roughness of the work roll of the acid rolling No. 1 frame is controlled to be 1.35 mu m.
The invention has the beneficial effects that: the surface of the strip steel is checked at the acid rolling inlet, the iron oxide dust on the surface of the strip steel is obviously reduced along with the reduction of the coiling temperature, the acid washing effect is greatly improved, the surface is bright white, the outlet thickness curve of the acid rolling No. 5 frame shows no thickness damping fluctuation, and the surface quality and the mechanical property after annealing meet the standard requirements.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1:
the W600 silicon steel is produced in a 1450 hot rolling unit, a cold rolling acid continuous rolling unit and a silicon steel annealing unit, the total volume is 90 rolls, and the specification of a finished product is 0.5mm multiplied by 1130-1260 mm.
(1) Controlling the hot rolling coiling temperature at 670 ℃;
(2) controlling the speed of the silicon steel in the pickling section to be 3 m/s;
(3) controlling the elongation rate of scale breaking withdrawal and straightening of the pickling section to be 1.5 percent and the tension of a scale breaking withdrawal and straightening machine to be 120 kN;
(4) controlling the acid liquor concentrations in acid tanks No. 1, No. 2 and No. 3 of the acid washing section to be 70g/L, 100 g/L and 145g/L respectively, and controlling the acid liquor temperatures in the acid tanks No. 1, No. 2 and No. 3 to be 85 ℃;
(5) the roughness of the working roll of the No. 1 stand of the acid rolling is controlled to be 1.40 mu m.
The surface of the strip steel is checked at the acid rolling inlet, the iron oxide dust on the surface of the strip steel is obviously reduced along with the reduction of the coiling temperature, the acid washing effect is greatly improved, the surface is bright white, the outlet thickness curve of the acid rolling No. 5 frame shows no thickness damping fluctuation, and the surface quality and the mechanical property after annealing meet the standard requirements.
Example 2:
the W600 silicon steel is produced in a 1450 hot rolling unit, a cold rolling acid continuous rolling unit and a silicon steel annealing unit, the total volume is 80 rolls, and the specification of a finished product is 0.5mm multiplied by 1130-1260 mm.
(1) Controlling the hot rolling coiling temperature to be 660 ℃;
(2) controlling the speed of the silicon steel in the pickling section to be 2.9 m/s;
(3) controlling the elongation rate of scale breaking withdrawal and straightening of the pickling section to be 1.45% and the tension of a scale breaking withdrawal and straightening machine to be 120 kN;
(4) controlling the acid liquor concentrations in acid tanks No. 1, No. 2 and No. 3 of the acid washing section to be 75 g/L, 105 g/L and 1405g/L respectively, and controlling the acid liquor temperatures in the acid tanks No. 1, No. 2 and No. 3 to be 83 ℃;
(5) the roughness of the working roll of the No. 1 stand of the acid rolling is controlled to be 1.35 mu m.
The surface of the strip steel is checked at the acid rolling inlet, the iron oxide dust on the surface of the strip steel is obviously reduced along with the reduction of the coiling temperature, the acid washing effect is greatly improved, the surface is bright white, the outlet thickness curve of the acid rolling No. 5 frame shows no thickness damping fluctuation, and the surface quality and the mechanical property after annealing meet the standard requirements.
Example 3:
the W600 silicon steel is produced in a 1450 hot rolling unit, a cold rolling acid continuous rolling unit and a silicon steel annealing unit in sequence, 70 coils are counted, and the specification of a finished product is 0.5mm multiplied by 1130-1260 mm.
(1) Controlling the hot rolling coiling temperature at 700 ℃;
(2) controlling the speed of the silicon steel in the pickling section to be 3.5 m/s;
(3) controlling the scale breaking withdrawal and straightening elongation rate of the pickling section to be 1% and controlling the tension of the scale breaking withdrawal and straightening machine to be 100 kN;
(4) controlling the acid liquor concentrations in acid tanks No. 1, No. 2 and No. 3 of the acid washing section to be 70g/L, 90 g/L and 140g/L respectively, and controlling the acid liquor temperatures in the acid tanks No. 1, No. 2 and No. 3 to be 80 ℃;
(5) the roughness of the working roll of the No. 1 stand of the acid rolling is controlled to be 1.2 mu m.
The inspection of the pickling inlet shows that the surface of the strip steel has more iron oxide dust, the effect after pickling is general, and the surface is dark. The outlet thickness curve of the acid rolling No. 5 frame shows that 13 rolls of 70 rolls produced have damping thickness fluctuation, and the damping thickness defect occurrence rate is 19 percent.
Claims (6)
1. A method for controlling thickness fluctuation of silicon steel comprises the steps of blank preparation, hot rolling, acid cleaning, cooling, coiling and finishing, wherein the hot rolling coiling temperature is controlled to be 650-680 ℃, the speed of the silicon steel in an acid cleaning section is 2.8-3.1m/s, the acid liquor concentrations in acid tanks 1, 2 and 3 of the acid cleaning section are 65-95 g/L, 85-125 g/L and 130-160g/L respectively, the acid liquor temperatures in acid tanks 1, 2 and 3 are 75-95 ℃, and the roughness of a working roll of a stand 1 of the acid rolling is 1.25-1.40 mu m; the method is characterized in that: controlling the elongation of the scale breaking withdrawal and straightening of the pickling section to be 1.3-1.6 percent and the tension of the scale breaking withdrawal and straightening machine to be 110-125 kN.
2. The method of controlling fluctuations in the thickness of silicon steel as set forth in claim 1, wherein: the hot rolling coiling temperature is controlled at 650-670 ℃.
3. The method of controlling fluctuations in the thickness of silicon steel as set forth in claim 1, wherein: the speed of the silicon steel in the pickling section is controlled to be 3 m/s.
4. The method of controlling fluctuations in the thickness of silicon steel as set forth in claim 1, wherein: the elongation rate of the scale breaking withdrawal and straightening of the pickling section is controlled to be 1.5%, and the tension of the scale breaking withdrawal and straightening machine is controlled to be 120 kN.
5. The method of controlling fluctuations in the thickness of silicon steel as set forth in claim 1, wherein: the acid liquor concentrations in the acid tanks 1, 2 and 3 of the acid washing section are respectively controlled to be 75-95 g/L, 105-125 g/L and 130-140g/L, and the acid liquor temperatures in the acid tanks 1, 2 and 3 are controlled to be 78-89 ℃.
6. The method of controlling fluctuations in the thickness of silicon steel as set forth in claim 1, wherein: the roughness of the working roll of the No. 1 acid rolling stand is controlled to be 1.35 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202036.7A CN110883092A (en) | 2019-11-29 | 2019-11-29 | Method for controlling thickness fluctuation of silicon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202036.7A CN110883092A (en) | 2019-11-29 | 2019-11-29 | Method for controlling thickness fluctuation of silicon steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110883092A true CN110883092A (en) | 2020-03-17 |
Family
ID=69749554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911202036.7A Pending CN110883092A (en) | 2019-11-29 | 2019-11-29 | Method for controlling thickness fluctuation of silicon steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110883092A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113083896A (en) * | 2021-02-20 | 2021-07-09 | 张家港宏昌钢板有限公司 | Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product prepared by same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103878173A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Production method for eliminating surface color difference of cold-rolled plate |
| CN108277433A (en) * | 2018-03-15 | 2018-07-13 | 马钢(集团)控股有限公司 | A kind of novel cold rolling high grade non-oriented electrical steel and its production method |
| CN109825775A (en) * | 2019-04-04 | 2019-05-31 | 中山市中圣金属板带科技有限公司 | A kind of cold-rolled non-oriented electrical steel 35WD1900 and its production method |
| CN109865742A (en) * | 2019-02-27 | 2019-06-11 | 江苏省沙钢钢铁研究院有限公司 | Production method of 440 MPa-level thin-specification hot-rolled pickled automobile plate |
| CN110369528A (en) * | 2019-07-09 | 2019-10-25 | 张家港扬子江冷轧板有限公司 | A method of improving DC01 strip pickling speed |
-
2019
- 2019-11-29 CN CN201911202036.7A patent/CN110883092A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103878173A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Production method for eliminating surface color difference of cold-rolled plate |
| CN108277433A (en) * | 2018-03-15 | 2018-07-13 | 马钢(集团)控股有限公司 | A kind of novel cold rolling high grade non-oriented electrical steel and its production method |
| CN109865742A (en) * | 2019-02-27 | 2019-06-11 | 江苏省沙钢钢铁研究院有限公司 | Production method of 440 MPa-level thin-specification hot-rolled pickled automobile plate |
| CN109825775A (en) * | 2019-04-04 | 2019-05-31 | 中山市中圣金属板带科技有限公司 | A kind of cold-rolled non-oriented electrical steel 35WD1900 and its production method |
| CN110369528A (en) * | 2019-07-09 | 2019-10-25 | 张家港扬子江冷轧板有限公司 | A method of improving DC01 strip pickling speed |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113083896A (en) * | 2021-02-20 | 2021-07-09 | 张家港宏昌钢板有限公司 | Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product prepared by same |
| CN113083896B (en) * | 2021-02-20 | 2022-06-14 | 张家港宏昌钢板有限公司 | Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101670372B (en) | A method for eliminating shape defects of hot-rolled high-strength steel plate | |
| CN109082607B (en) | A kind of non-oriented silicon steel and hot rolling production method thereof | |
| CN105689392A (en) | Production method for ultra-thin cold-rolled enamelled steel strips | |
| CN108994081B (en) | Method for producing low-carbon steel by ferrite rolling in ESP production line | |
| EP2067541B1 (en) | Method for continuously manufacturing cold-rolled steel | |
| CN109365530A (en) | Hot continuous rolling production method of high-grade non-oriented silicon steel | |
| CN111424150A (en) | SPHC hot-rolled pickled plate without transverse crease defect and production method thereof | |
| CN112317536A (en) | Manufacturing method of pattern plate with extremely thin specification | |
| CN105251779B (en) | A kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method | |
| CN109622619A (en) | The method and its product of cold continuous rolling production high grade non-oriented electrical steel | |
| CN113145642A (en) | Pickling plate and preparation method thereof | |
| CN109182918A (en) | A kind of vanadium Nb-microalloying low-carbon hot-rolling ribbon steel and preparation method thereof | |
| CN102989771A (en) | Low-chromium ferritic stainless steel cold continuous rolling manufacturing method | |
| CN110883092A (en) | Method for controlling thickness fluctuation of silicon steel | |
| CN109517958B (en) | Production method of hot-rolled pickled steel plate MM390 for electroplating | |
| CN111663078A (en) | Hot-rolled pickled plate and method for eliminating pit defect of hot-rolled pickled plate | |
| CN114226453B (en) | Manufacturing method for low-carbon steel and improving performance uniformity of ferrite-rolled low-carbon steel | |
| CN103272841B (en) | Cold rolling technology of stainless steel clad plate strip coil | |
| CN113617843B (en) | Method for eliminating residual stress of hot-rolled strip steel at high temperature | |
| CN110508629B (en) | Method for eliminating defects of landscape painting on surface of low-carbon aluminum killed steel after acid pickling | |
| CN112828036B (en) | Method for improving low-temperature impact toughness of thick high-strength steel | |
| CN108339851B (en) | A cold-rolling and annealing method for an ultra-thin strip of grain-oriented silicon steel | |
| CN1788870A (en) | On-line heat treatment method for hot rolling stainless steel band for cold rolling | |
| CN113083896B (en) | Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product | |
| CN114535313B (en) | Method for eliminating grid defects on surface of thin hot-rolled pickled plate |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200317 |