CN112680738A - Surface treatment method for aluminum alloy plate strip - Google Patents
Surface treatment method for aluminum alloy plate strip Download PDFInfo
- Publication number
- CN112680738A CN112680738A CN202011469005.0A CN202011469005A CN112680738A CN 112680738 A CN112680738 A CN 112680738A CN 202011469005 A CN202011469005 A CN 202011469005A CN 112680738 A CN112680738 A CN 112680738A
- Authority
- CN
- China
- Prior art keywords
- washing
- strip
- alkali
- water
- aluminum alloy
- 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
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a surface treatment method of an aluminum alloy plate strip, which comprises the following specific steps: the aluminum alloy plate strip to be treated sequentially passes through primary alkali washing, secondary alkali washing, tertiary alkali washing, primary water washing, acid washing, secondary water washing, tertiary water washing and quaternary water washing, and the interval time of each alkali washing, acid washing and water washing is not more than 5 s. In the invention, acid washing is carried out by spraying acid liquid on the surface of the aluminum strip, neutralizing residual alkali liquid on the surface of the strip, activating the surface layer of the aluminum strip, removing alloy elements accumulated on the surface of the strip in the treatment process, and improving the adhesive force of a coating while brightening; and the second water washing, the third water washing and the fourth water washing are used for washing the surface of the strip by pure water or deionized water so as to ensure that residual media on the surface of the strip are removed. The invention has the advantages of superior process and strong practicability.
Description
Technical Field
The invention relates to the technical field of metallurgical equipment, in particular to a surface treatment method for an aluminum alloy plate strip.
Background
The field of plate and strip finishing and treatment, in particular to an aluminum alloy plate and strip coating machine set, incoming material aluminum coils contain oil stains, putty, blackening and the like and need to be cleaned; subsequent coatings need to improve the adhesion of the coating material and the aluminium plate. The surface treatment process of the aluminum alloy plate strip comprises a combined cleaning process of oil cleaning, water cleaning, alkali cleaning and water cleaning. The oil cleaning has affinity effect because the cleaning oil and the cold rolling oil belong to the same type of products, the oil cleaning is easier than the water cleaning, but a layer of extremely thin clean oil film is left on the plate surface cleaned by the oil, although the scratch and the oxidation of the plate surface can be avoided, the requirements of coating products can not be met. The processing technology is mainly used for longitudinal and transverse cutting machine sets of aluminum alloy plates; water is used for cleaning, water is heated to a certain temperature, and cold rolling oil on the surface of the plate is removed through high-pressure spraying and low-pressure spraying; the combined washing of alkali washing and water washing is to add alkali washing on the basis of water washing to remove cold rolling oil on the surface of the aluminum alloy plate strip. The water cleaning and alkali cleaning and water cleaning combined cleaning treatment process is used for an aluminum alloy plate strip withdrawal and straightening cleaning unit or a cleaning and degreasing unit. Most of the existing treatment processes are designed to meet the requirements of cleaning oil stains, can not remove alloy elements accumulated on the surface of a strip material in the treatment process, can not achieve the purposes of brightening and improving the adhesive force of a coating, and can not meet the requirements of a coating product.
Most of the existing cleaning processes are designed to meet the requirements of cleaning oil stains, or can not meet the requirements of continuous production and coating products.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the surface treatment method of the aluminum alloy plate strip, which has the advantages of simple process, strong practicability and easy implementation.
The technical scheme adopted by the invention is as follows:
a surface treatment method of an aluminum alloy plate strip comprises the following specific steps: the aluminum alloy plate strip to be treated sequentially passes through primary alkali washing, secondary alkali washing, tertiary alkali washing, primary water washing, acid washing, secondary water washing, tertiary water washing and quaternary water washing, and the interval time of each alkali washing, acid washing and water washing is not more than 5 s; wherein, the first alkaline washing, the second alkaline washing and the third alkaline washing are respectively provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate strip; a wringing roller is arranged between the first alkali washing and the second alkali washing treatment process, and a wringing roller is arranged between the second alkali washing and the third alkali washing treatment process; the first washing is provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate strip, and a double wringing roller is arranged between the first washing and the third alkali washing treatment process; the pickling device is characterized in that a plurality of groups of spray pipes are arranged for spraying and cleaning the upper side and the lower side of the surface of the plate belt, double squeezing rollers are arranged between the pickling process and the first water washing process to reduce the liquid leakage of the first water washing to the pickling process, and meanwhile, the double squeezing rollers are arranged between the pickling process and the second water washing process to prevent the liquid leakage of the pickling process to the second water washing and pollution to the second water washing; the second washing, the third washing and the fourth washing are respectively provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate belt, a wringing roller is arranged between the second washing and the third washing treatment process, and a wringing roller is arranged between the third washing and the fourth washing treatment process; and (4) washing the surface of the aluminum alloy plate strip by the fourth washing, the third washing and the second washing step by step overflowing.
The first alkaline washing, the second alkaline washing and the third alkaline washing all adopt alkaline agents and medium deionized water, the concentration of a tank liquor is 1-5%, the temperature of the tank liquor is 50-60 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the operation time is not less than 5 s.
The first alkali washing adopts hot alkali liquor to carry out degreasing and cleaning on the surface of the strip in a spraying mode, so as to realize pre-cleaning.
And the second alkali washing is to further degrease and clean the surface of the strip by adopting hot alkali liquor in a spraying manner so as to remove oil stains on the surface of the strip.
The first washing adopts deionized water and deionized water as a medium, the temperature of a bath solution is 50-70 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 3.8 s; the first water washing adopts a hot spraying mode to wash the surface of the strip.
The pickling process is characterized in that a pickling agent is matched with medium deionized water, the concentration of a bath solution is 1-5%, the temperature of the bath solution is 50-60 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 5 s; acid cleaning is carried out by spraying acid solution on the surface of the aluminum strip to neutralize residual alkali solution on the surface of the strip.
The second water washing, the third water washing and the fourth water washing adopt deionized water matched with a medium, the temperature of the bath solution is 50-70 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 3.8 s.
The deionized water is directly supplied from the fourth washing, overflows to the third washing and then overflows to the second washing until being discharged.
The invention has the beneficial effects that:
the invention effectively removes oil stains and putty on the surface of the aluminum alloy plate strip, activates the surface layer of the aluminum alloy plate strip, achieves light emission, improves the adhesive force of the surface of the coating, meets the continuous production requirement of the coating product, and has the advantages of simple process, convenient maintenance and easy implementation.
Detailed Description
Example 1:
in order to overcome the defects of the prior art, the invention provides the surface treatment method of the aluminum alloy plate strip, which has the advantages of simple process, strong practicability and easy implementation.
A surface treatment method of an aluminum alloy plate strip comprises the following specific steps: the aluminum alloy plate strip to be treated sequentially passes through primary alkali washing, secondary alkali washing, tertiary alkali washing, primary water washing, acid washing, secondary water washing, tertiary water washing and quaternary water washing, and the interval time of each alkali washing, acid washing and water washing is not more than 5 s; wherein, the first alkaline washing, the second alkaline washing and the third alkaline washing are respectively provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate strip; a wringing roller is arranged between the first alkali washing and the second alkali washing treatment process, and a wringing roller is arranged between the second alkali washing and the third alkali washing treatment process; the first washing is provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate strip, and a double wringing roller is arranged between the first washing and the third alkali washing treatment process; the pickling device is characterized in that a plurality of groups of spray pipes are arranged for spraying and cleaning the upper side and the lower side of the surface of the plate belt, double squeezing rollers are arranged between the pickling process and the first water washing process to reduce the liquid leakage of the first water washing to the pickling process, and meanwhile, the double squeezing rollers are arranged between the pickling process and the second water washing process to prevent the liquid leakage of the pickling process to the second water washing and pollution to the second water washing; the second washing, the third washing and the fourth washing are respectively provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate belt, a wringing roller is arranged between the second washing and the third washing treatment process, and a wringing roller is arranged between the third washing and the fourth washing treatment process; and (4) washing the surface of the aluminum alloy plate strip by the fourth washing, the third washing and the second washing step by step overflowing.
In the specific use process of the invention, 12 groups of spray pipes are respectively arranged for the first alkali washing, the second alkali washing and the third alkali washing to spray and clean the upper side and the lower side of the surface of the plate strip. A wringing roller is arranged between the first alkali washing and the second alkali washing treatment process, and a wringing roller is arranged between the second alkali washing and the third alkali washing treatment process. Effectively prevents the problems of liquid channeling between the first alkali washing and second alkali washing treatment processes and the second alkali washing and third alkali washing treatment processes, and realizes the gradual cleaning of the oil stains on the board surface.
The invention sets 9 groups of spray pipes for spray cleaning of the upper side and the lower side of the surface of the plate strip in the first washing, and sets double wringing rollers between the first washing and the third alkali washing treatment process, so as to reduce alkali liquor residue on the surface of the plate strip after the third alkali washing treatment process and prevent liquid channeling, and finally realize the cleaning of the surface of the plate strip.
In the invention, 12 groups of spray pipes are arranged in the pickling device to spray and clean the upper side and the lower side of the surface of the plate strip. And a double wringing roller is arranged between the pickling and the first washing treatment process so as to reduce the influence of liquid channeling to pickling in the first washing treatment process on the pickling effect of pickling. And meanwhile, a double wringing roller is arranged between the pickling and secondary washing treatment processes, so that the pickling liquid is prevented from flowing to the secondary washing and polluting the secondary washing. The coating is cleaned by the treatment process, so that the coating adhesive force is finally improved and the coating product quality is ensured.
The second water washing, the third water washing and the fourth water washing are respectively provided with 9 groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate belt. A wringing roller is arranged between the second washing and the third washing treatment process, and a wringing roller is arranged between the third washing and the fourth washing treatment process. The problem of liquid channeling between the second washing and the third washing treatment process and between the third washing and the fourth washing treatment process is effectively prevented, and the surfaces of the aluminum alloy plate belts are cleaned by gradually overflowing in the fourth washing, the third washing and the second washing.
The invention adopts multiple alkali washing, acid washing and multiple water washing to ensure that residual media on the surface of the strip are removed. The invention removes oil stain and putty on the surface of the aluminum alloy plate strip, activates the surface layer of the aluminum alloy plate strip, achieves light emission, improves the adhesive force of the surface of the coating, meets the continuous production requirement of the coating product, and has the advantages of simple process, convenient maintenance and easy implementation.
Example 2:
based on the embodiment 1, in this embodiment, preferably, the first alkaline washing, the second alkaline washing and the third alkaline washing all use deionized water as a medium for an alkaline agent, the concentration of the bath solution is 1% to 5%, the temperature of the bath solution is 50 to 60 ℃, the pressure of a nozzle is 1.5 to 2.5bar, and the operation time is not less than 5 s.
Preferably, the first alkali washing adopts hot alkali liquor to carry out degreasing cleaning on the surface of the strip in a spraying mode, so as to realize pre-cleaning.
Preferably, the second alkali washing is to further degrease and clean the surface of the strip by spraying hot alkali liquor in a spraying manner so as to remove oil stains on the surface of the strip.
In the invention, the third alkali washing adopts hot alkali liquor to carry out final alkali washing on the surface of the strip in a spraying mode; the temperature of the bath solution of the hot alkali liquor is 50-60 ℃, the pressure of a nozzle is 1.5-2.5 bar, the concentration of the bath solution is 1-5%, and the running time is not less than 5 s. The alkaline medicament in the invention is the prior art, and Kemitel or Hangao products can be directly purchased in the market, and the invention will not be further described.
In the invention, the same concentration and temperature are adopted for the three times of alkali washing, so that the treatment process is simplified, and the resources are effectively saved. In the invention, the three times of alkaline washing are mainly used for preventing unclean washing, the tank liquor is recycled, and secondary pollution to the plate belt is easily caused. Meanwhile, the three times of alkali washing achieves the cleaning effect on the premise of ensuring no waste. If three alkaline washes are combined into one then the cleaning effect is not divided into three washes clean.
Preferably, deionized water is used as a medium for deionized water for the first washing, the temperature of a bath solution is 50-70 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 3.8 s; the first water washing adopts a hot spraying mode to wash the surface of the strip.
Preferably, the pickling is carried out by using a pickling agent and deionized water as a medium, the concentration of a bath solution is 1-5%, the temperature of the bath solution is 50-60 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 5 s; acid liquor is sprayed on the surface of the aluminum strip in a spraying mode in the acid washing process, residual alkali liquor on the surface of the aluminum strip is neutralized, the surface layer of the aluminum strip is activated, alloy elements accumulated on the surface of the aluminum strip in the treatment process are removed, and the adhesion of a coating is improved while light is emitted.
The acidic medicament in the invention is a Kemite or Hangao product, is a prior art and can be directly purchased, and further description is not needed in the invention.
Preferably, deionized water is adopted for the second water washing, the third water washing and the fourth water washing, the temperature of the bath solution is 50-70 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 3.8 s. Three water washes were performed to ensure removal of residual media from the surface of the strip.
Preferably, the deionized water is directly supplied from the fourth water washing, overflows to the third water washing, and overflows to the second water washing until being discharged. The cleaning quality is ensured, and the water consumption is saved.
The invention is successfully applied to a certain aluminum plate coating unit, after the production is put into operation, the yield is 2.18 ten thousand tons/year, and the specification of the strip steel is as follows: the width B is 800-1800 mm, the thickness h is 0.18-0.5 mm, and the maximum running speed vmax of the unit is 60m/min, so that the continuous production requirement of a coating product is met.
The invention effectively removes oil stains and putty on the surface of the aluminum alloy plate strip, activates the surface layer of the aluminum alloy plate strip, achieves light emission, improves the adhesive force of the surface of the coating, and meets the continuous production requirement of the coating product. The invention has simple process, convenient maintenance and easy implementation.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims. The method steps and reagents not described in detail in the present invention are prior art and will not be further described in the present invention.
Claims (8)
1. A surface treatment method of an aluminum alloy plate strip is characterized by comprising the following steps: the method comprises the following specific steps: the aluminum alloy plate strip to be treated sequentially passes through primary alkali washing, secondary alkali washing, tertiary alkali washing, primary water washing, acid washing, secondary water washing, tertiary water washing and quaternary water washing, and the interval time of each alkali washing, acid washing and water washing is not more than 5 s; wherein, the first alkaline washing, the second alkaline washing and the third alkaline washing are respectively provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate strip; a wringing roller is arranged between the first alkali washing and the second alkali washing treatment process, and a wringing roller is arranged between the second alkali washing and the third alkali washing treatment process; the first washing is provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate strip, and a double wringing roller is arranged between the first washing and the third alkali washing treatment process; the pickling device is characterized in that a plurality of groups of spray pipes are arranged for spraying and cleaning the upper side and the lower side of the surface of the plate belt, double squeezing rollers are arranged between the pickling process and the first water washing process to reduce the liquid leakage of the first water washing to the pickling process, and meanwhile, the double squeezing rollers are arranged between the pickling process and the second water washing process to prevent the liquid leakage of the pickling process to the second water washing and pollution to the second water washing; the second washing, the third washing and the fourth washing are respectively provided with a plurality of groups of spray pipes for spraying and cleaning the upper side and the lower side of the surface of the plate belt, a wringing roller is arranged between the second washing and the third washing treatment process, and a wringing roller is arranged between the third washing and the fourth washing treatment process; and (4) washing the surface of the aluminum alloy plate strip by the fourth washing, the third washing and the second washing step by step overflowing.
2. The surface treatment method of an aluminum alloy strip as set forth in claim 1, characterized in that: the first alkaline washing, the second alkaline washing and the third alkaline washing all adopt alkaline agents and medium deionized water, the concentration of a tank liquor is 1-5%, the temperature of the tank liquor is 50-60 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the operation time is not less than 5 s.
3. The surface treatment method of an aluminum alloy strip as set forth in claim 2, characterized in that: the first alkali washing adopts hot alkali liquor to carry out degreasing and cleaning on the surface of the strip in a spraying mode, so as to realize pre-cleaning.
4. The surface treatment method of an aluminum alloy strip as set forth in claim 2, characterized in that: and the second alkali washing is to further degrease and clean the surface of the strip by adopting hot alkali liquor in a spraying manner so as to remove oil stains on the surface of the strip.
5. The surface treatment method of an aluminum alloy strip as set forth in claim 1, characterized in that: the first washing adopts deionized water and deionized water as a medium, the temperature of a bath solution is 50-70 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 3.8 s; the first water washing adopts a hot spraying mode to wash the surface of the strip.
6. The surface treatment method of an aluminum alloy strip as set forth in claim 1, characterized in that: the pickling process is characterized in that a pickling agent is matched with medium deionized water, the concentration of a bath solution is 1-5%, the temperature of the bath solution is 50-60 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 5 s; acid cleaning is carried out by spraying acid solution on the surface of the aluminum strip to neutralize residual alkali solution on the surface of the strip.
7. The surface treatment method of an aluminum alloy strip as set forth in claim 1, characterized in that: the second water washing, the third water washing and the fourth water washing adopt deionized water matched with a medium, the temperature of the bath solution is 50-70 ℃, the pressure of a nozzle is 1.5-2.5 bar, and the running time is not less than 3.8 s.
8. The surface treatment method of an aluminum alloy strip as set forth in claim 7, characterized in that: the deionized water is directly supplied from the fourth washing, overflows to the third washing and then overflows to the second washing until being discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011469005.0A CN112680738A (en) | 2020-12-15 | 2020-12-15 | Surface treatment method for aluminum alloy plate strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011469005.0A CN112680738A (en) | 2020-12-15 | 2020-12-15 | Surface treatment method for aluminum alloy plate strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112680738A true CN112680738A (en) | 2021-04-20 |
Family
ID=75447611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011469005.0A Pending CN112680738A (en) | 2020-12-15 | 2020-12-15 | Surface treatment method for aluminum alloy plate strip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112680738A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118422215A (en) * | 2024-05-08 | 2024-08-02 | 浙江众凌科技有限公司 | Novel Invar raw material cleaning line body and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100834454B1 (en) * | 2007-03-02 | 2008-06-05 | 주식회사 렉스 | Method and device for treating rod-shape object |
| CN104014504A (en) * | 2014-05-05 | 2014-09-03 | 无锡锦绣轮毂有限公司 | Hub surface pretreatment technology |
| CN105369271A (en) * | 2015-12-10 | 2016-03-02 | 董晓娜 | Before-coating metal surface treatment method |
| CN107620084A (en) * | 2017-10-31 | 2018-01-23 | 江油市丰威新材料有限责任公司 | System is washed in a kind of silicon strip soda acid combination and technique is washed in combination |
| CN109295491A (en) * | 2018-11-08 | 2019-02-01 | 天津磊峰实业有限公司 | A kind of pretreatment process for electrophoresis coating |
-
2020
- 2020-12-15 CN CN202011469005.0A patent/CN112680738A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100834454B1 (en) * | 2007-03-02 | 2008-06-05 | 주식회사 렉스 | Method and device for treating rod-shape object |
| CN104014504A (en) * | 2014-05-05 | 2014-09-03 | 无锡锦绣轮毂有限公司 | Hub surface pretreatment technology |
| CN105369271A (en) * | 2015-12-10 | 2016-03-02 | 董晓娜 | Before-coating metal surface treatment method |
| CN107620084A (en) * | 2017-10-31 | 2018-01-23 | 江油市丰威新材料有限责任公司 | System is washed in a kind of silicon strip soda acid combination and technique is washed in combination |
| CN109295491A (en) * | 2018-11-08 | 2019-02-01 | 天津磊峰实业有限公司 | A kind of pretreatment process for electrophoresis coating |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118422215A (en) * | 2024-05-08 | 2024-08-02 | 浙江众凌科技有限公司 | Novel Invar raw material cleaning line body and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020232937A1 (en) | Strip steel high-efficiency degreasing and cleaning apparatus and method | |
| US9815172B2 (en) | Method of steel sheet surface treatment and apparatus of the same | |
| CN100455370C (en) | Leveling machine, black strip acid-free derusting device using the same and method thereof | |
| CA2634403C (en) | Method for cleaning hot dip galvanized steel sheet and cleaning apparatus therefor | |
| CN112680738A (en) | Surface treatment method for aluminum alloy plate strip | |
| CN104419940A (en) | Steel wire surface treatment method | |
| CA2969369A1 (en) | Method and system of treating a carbon steel strip, especially for a pickling treatment | |
| CN109554696B (en) | Copper alloy strip surface treatment process and copper alloy strip surface treatment equipment | |
| US2628924A (en) | Method of cleaning strip | |
| JP6135575B2 (en) | Cold-rolled steel sheet cooling method, cooling equipment, and cold-rolled steel sheet manufacturing method | |
| CN110893420A (en) | Rolled strip surface cleaning device | |
| CN114807954B (en) | Strip steel pickling method with rust-proof effect and strip steel pickling line thereof | |
| CN211413199U (en) | Rolled strip surface cleaning device | |
| CN114107997A (en) | Efficient oil-removing cleaning process for copper strip | |
| JPH05125573A (en) | Continuous pickling and rinsing method and device for steel sheet | |
| JPS5940525B2 (en) | Temper rolling method | |
| JPH059787A (en) | Roll cleaning device | |
| CN112404147A (en) | Waste judgment and repair process in production process of stainless steel strip | |
| CN218262764U (en) | Finishing machine roll surface color difference cleaning system | |
| JP7207357B2 (en) | Method for pickling metal plate and method for manufacturing metal plate | |
| JP4523878B2 (en) | Method and apparatus for producing surface-treated steel sheet with excellent appearance | |
| CN217579078U (en) | Cold-rolled strip steel pickling equipment | |
| JPH0959789A (en) | Washing method for cold rolled steel strip for continuous annealing equipment and device therefor | |
| JP2003321787A (en) | Degreasing method of metallic plate and degreasing apparatus thereof | |
| JPH10265986A (en) | Method for continuously annealing and pickling cold rolled stainless steel strip and device therefor |
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 |
Application publication date: 20210420 |
|
| RJ01 | Rejection of invention patent application after publication |