CN115011966A - Preparation method of continuous hot-dip galvanized strip steel - Google Patents
Preparation method of continuous hot-dip galvanized strip steel Download PDFInfo
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- CN115011966A CN115011966A CN202210729297.XA CN202210729297A CN115011966A CN 115011966 A CN115011966 A CN 115011966A CN 202210729297 A CN202210729297 A CN 202210729297A CN 115011966 A CN115011966 A CN 115011966A
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- dip galvanized
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000005246 galvanizing Methods 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 8
- 238000000992 sputter etching Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 21
- 238000000137 annealing Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005530 etching Methods 0.000 claims description 12
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 11
- 239000008397 galvanized steel Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 4
- 238000002161 passivation Methods 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 16
- 239000000956 alloy Substances 0.000 abstract description 16
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011701 zinc Substances 0.000 abstract description 9
- 229910052725 zinc Inorganic materials 0.000 abstract description 9
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 230000003647 oxidation Effects 0.000 abstract description 6
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 description 12
- 239000000758 substrate Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F4/00—Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00
- C23F4/04—Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00 by physical dissolution
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to a preparation method of continuous hot-dip galvanized strip steel, belonging to the field of hot-dip of metal strips. According to the preparation method, after the strip steel is cleaned and subjected to phase change heat treatment before the inlet section of the continuous hot galvanizing zinc pot, the strip steel is subjected to ion etching cleaning before entering the zinc pot, and an external oxidation layer formed on the surface of the strip steel due to heat treatment is removed, so that the surface activity of the strip steel is improved, the wettability of zinc liquid on the strip steel is improved, and a defect-free zinc coating is formed on the surfaces of high-strength steel and ultrahigh-strength steel with high alloy components. The invention effectively solves the problem of reduced platability of high-strength steel and ultrahigh-strength steel caused by high alloy content, and manufactures high-quality-grade and high-added-value products under the condition of not influencing the production of the original production line.
Description
Technical Field
The invention belongs to the field of hot plating of metal strips, and relates to a preparation method of continuous hot-galvanized strip steel.
Background
The most common defect of hot galvanizing of strip steel is skip plating, and the defect of skip plating is usually caused by that alloy elements in a matrix diffuse to the surface of the matrix to generate oxidation reaction to generate oxides, so that the wettability of the matrix and zinc liquid is reduced. Such defects are very significant in high-strength steels and ultra-high strength among high alloy compositions because a large amount of alloy elements are added to the two types of steels to greatly improve the strength and hardenability.
At present, most steel enterprises adopt a pre-oxidation-reduction mode to improve the platability aiming at the hot galvanizing of high alloy strip steel so as to produce hot galvanizing products meeting the quality requirements. The principle is that the heating section of the annealing furnace is an oxidizing atmosphere, the speed of oxygen in the atmosphere diffusing inwards is higher than the speed of alloy elements diffusing outwards, the oxidation of the alloy elements occurs below the surface of a substrate, and iron on the surface of the substrate is oxidized at the same time to form an iron oxide surface layer. The subsequent heat preservation section is in a reduction type atmosphere, and reduces the ferric oxide on the surface of the matrix into iron, so that the surface of the matrix is almost free from oxides of alloy elements, and the wettability of the surface of the matrix is improved. However, the pre-oxidation-reduction method is only suitable for high-strength steel with the pressure of 1200MPa or less, and the method still cannot improve the plating leakage defect for products with higher alloy components.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing a continuous hot-dip galvanized steel strip, so as to effectively solve the problem of platability of high-strength steel and ultrahigh-strength steel with high alloy content in continuous hot-dip galvanizing.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of continuous hot-dip galvanized strip steel comprises the following steps:
s1 washing with alkali to remove oil;
s2 annealing phase change treatment;
s3 etching the external oxide layer;
s4 equilibrium reheating treatment;
s5 hot galvanizing treatment;
and S6 post-processing.
Optionally, step S3 employs a group including, but not limited to, one or more process combinations of magnetron ion cleaning, reverse magnetron ion cleaning, anode layer ion cleaning, arc striking glow discharge ion cleaning, and the like.
Optionally, in step S3, ion etching cleaning is performed to remove oxides formed on the surface of the strip steel after phase change annealing; the etching rate is 10 nm/s-30 nm/s.
Optionally, step S3 is performed in a vacuum environment, and the vacuum degree is 1Pa to 1 × 10 -4 Pa。
Optionally, in step S2, the method includes, but is not limited to, H 2 Or N 2 The gas is cooled.
Optionally, in step S2, the dew point is-60 ℃ to-15 ℃.
Optionally, in step S2, the outlet temperature is not higher than 200 ℃.
Optionally, in step S4, N is adopted 2 And 2% -20% of H 2 And (5) protecting the mixed gas.
Optionally, in step S4, the heating temperature of the strip steel is 450 to 480 ℃.
Optionally, step S6 includes finishing, straightening, and passivation oiling.
The invention has the beneficial effects that:
the invention adopts the ion etching method to remove the Si, Mn and Cr external oxide layers formed in the heat treatment process of the strip steel, improves the surface activity of the matrix, can prepare the high-strength hot-dip galvanized strip steel with high content of alloy elements, increases the product types, improves the added value of the product, can also avoid the atmosphere switching of an annealing furnace, simplifies the production operation, saves the production time and improves the production efficiency.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a method for preparing a continuous hot-dip galvanized steel strip, the steel strip is cleaned by alkali to remove oil stains on the surface, and then is put into an annealing furnace with reducing atmosphere to be subjected to phase change heat treatment, wherein the dew point is-60 ℃ to-15 ℃. In the annealing furnace in the environment, alloy elements such as Si, Mn, Cr and the like in the strip steel diffuse outwards and react with trace oxygen elements in the atmosphere on the surface of a substrate to generate oxides. The strip steel enters an oxide layer etching section in a vacuum environment after being taken out of the annealing furnace, and the surface oxide layer is etched and stripped under the impact of high-energy ions, so that 'fresh' matrix iron is exposed on the surface of the matrix, and the surface activity of the matrix is improved, and the etching speed is different from 10nm/s to 30nm/s according to different alloy component contents of different steel types. And then the strip steel is heated to more than 460 ℃ in a balanced way to prepare for entering a zinc pot for galvanizing. And (4) the strip steel after balanced heating enters a zinc pot for galvanizing, and then is cooled by a post-galvanizing cooling section to finish galvanizing. And the strip steel is subjected to subsequent finishing, straightening, passivation and oiling to obtain a finished galvanized product.
The invention removes the alloy element oxide layer on the surface of the high-strength steel and the annealed ultrahigh-strength steel by adopting ion etching, improves the platability of the strip steel and makes the preparation of the ultrahigh-strength steel hot-dip galvanized product with high alloy element content possible.
The invention is further described below by way of example for the production of hot-dip galvanized MS1500 steel and PH1500 steel products, but the production method according to the invention is not limited to the production of such steel grades and coatings.
Example one
And (3) carrying out alkali washing and drying on the cold-rolled MS1500 substrate, then feeding the cold-rolled MS1500 substrate into a continuous annealing furnace, and carrying out phase change treatment according to a set annealing process. Annealing furnace of 95% N 2 And 5% of H 2 The dew point of the reducing atmosphere is-45 ℃, and after the heat preservation section is kept at a certain temperature for a certain time, the cooling speed is 60 ℃/sCooling to below 200 deg.C by cooling method H 2 And (6) cooling. Then the strip steel enters an oxidation etching section in a vacuum environment under the protective atmosphere, and the vacuum degree of the oxidation etching section is 3.4 multiplied by 10 -4 And Pa in the section, oxides of Si, Cr, Mn and the like on the surface of the matrix are cleaned and removed by adopting arc striking glow discharge ion etching, and the etching speed is 23 nm/s. And then the strip steel enters an equalizing heating furnace in protective atmosphere to be heated up, the temperature of the strip steel is raised to 465 ℃, the strip steel is kept warm for 20s and then enters a zinc pot through a furnace nose to be subjected to hot galvanizing treatment, and then the coating is subjected to air cooling solidification in a cooling section. And straightening, passivating and oiling the galvanized strip steel to finish the preparation of the product. The running speed of the strip steel is 120 m/s.
Example two
And (3) carrying out alkali washing and drying on the cold-rolled PH1500 substrate, then feeding the cold-rolled PH1500 substrate into a continuous annealing furnace, and carrying out phase change treatment according to a set annealing process. Annealing furnace of 95% N 2 And 5% of H 2 The dew point of the reducing atmosphere is-55 ℃, the temperature is kept for a certain period of time in the heat preservation section, and then the reducing atmosphere is cooled to below 200 ℃ at the cooling speed of 25 ℃/s, wherein the cooling mode is N 2 And (6) cooling. Then the strip steel enters an oxidation etching section in a vacuum environment under the protective atmosphere, and the vacuum degree of the oxidation etching section is 2 multiplied by 10 -4 And Pa in the section, oxides of Si, Cr, Mn and the like on the surface of the matrix are cleaned and removed by adopting arc striking glow discharge ion etching, and the etching speed is 20 nm/s. And then the strip steel enters an equalizing heating furnace in protective atmosphere to be heated, the temperature of the strip steel is raised to 468 ℃, the strip steel is kept warm for 25s and then enters a zinc pot through a furnace nose to be subjected to hot galvanizing treatment, and then the coating is subjected to air cooling solidification in a cooling section. And straightening, passivating and oiling the galvanized strip steel to finish the preparation of the product.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A preparation method of continuous hot-dip galvanized strip steel is characterized by comprising the following steps:
s1 washing with alkali to remove oil;
s2 annealing phase change treatment;
s3 etching the external oxide layer;
s4, carrying out uniform reheating treatment;
s5 hot galvanizing treatment;
and S6 post-processing.
2. A method of producing a continuously hot-dip galvanized steel strip as claimed in claim 1, characterized in that: step S3 is performed by one or a combination of several processes of magnetic control ion cleaning, reverse magnetic control ion cleaning, anode layer ion cleaning, and arc-striking glow discharge ion cleaning.
3. The method for manufacturing a continuous hot-dip galvanized steel strip according to claim 1, characterized in that: step S3, ion etching cleaning is adopted to remove oxide formed on the surface of the strip steel after phase change annealing; the etching rate is 10 nm/s-30 nm/s.
4. The method for manufacturing a continuous hot-dip galvanized steel strip according to claim 1, characterized in that: step S3 is carried out in vacuum environment with vacuum degree of 1 Pa-1 × 10 -4 Pa。
5. The method for manufacturing a continuous hot-dip galvanized steel strip according to claim 1, characterized in that: in step S2, H is used 2 Or N 2 Gas cooling is performed.
6. A method for manufacturing a continuous hot-dip galvanized steel strip as claimed in claim 5, characterized in that: in step S2, the dew point is-60 ℃ to-15 ℃.
7. A method for manufacturing a continuous hot-dip galvanized steel strip as claimed in claim 6, characterized in that: in step S2, the outlet temperature is not higher than 200 ℃.
8. The method for manufacturing a continuous hot-dip galvanized steel strip according to claim 1, characterized in that: in step S4, N is used 2 And 2% -20% of H 2 And (5) protecting the mixed gas.
9. The method for preparing the continuous hot-dip galvanized steel strip according to claim 8, characterized by comprising the following steps: in step S4, the heating temperature of the strip steel is 450-480 ℃.
10. The method for manufacturing a continuous hot-dip galvanized steel strip according to claim 1, characterized in that: and step S6 includes finishing, straightening, and passivation oiling.
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| CN202210729297.XA CN115011966A (en) | 2022-06-24 | 2022-06-24 | Preparation method of continuous hot-dip galvanized strip steel |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04337057A (en) * | 1991-05-14 | 1992-11-25 | Nisshin Steel Co Ltd | Treatment for steel sheet before hot-dip metal coating |
| JPH10158802A (en) * | 1996-12-06 | 1998-06-16 | Kawasaki Steel Corp | Production of hot dip coated hot rolled steel sheet |
| JP2004263271A (en) * | 2003-03-04 | 2004-09-24 | Jfe Steel Kk | Method for manufacturing high-tensile galvanized steel plate |
| KR20060074365A (en) * | 2004-12-27 | 2006-07-03 | 주식회사 포스코 | Hot dipping apparatus and method |
| CN103160764A (en) * | 2013-03-25 | 2013-06-19 | 冷水江钢铁有限责任公司 | Single-side continuous hot zinc-plating method for composite strip steel |
| KR20150073299A (en) * | 2013-12-20 | 2015-07-01 | 주식회사 포스코 | Method for manufacturing zinc coated steel sheet having excellent coating adhesion and zinc coated steel sheet produced using the same |
| CN111485188A (en) * | 2020-04-02 | 2020-08-04 | 鞍钢股份有限公司 | Method for improving surface platability of high-strength steel plate by adopting pre-oxidation technology |
-
2022
- 2022-06-24 CN CN202210729297.XA patent/CN115011966A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04337057A (en) * | 1991-05-14 | 1992-11-25 | Nisshin Steel Co Ltd | Treatment for steel sheet before hot-dip metal coating |
| JPH10158802A (en) * | 1996-12-06 | 1998-06-16 | Kawasaki Steel Corp | Production of hot dip coated hot rolled steel sheet |
| JP2004263271A (en) * | 2003-03-04 | 2004-09-24 | Jfe Steel Kk | Method for manufacturing high-tensile galvanized steel plate |
| KR20060074365A (en) * | 2004-12-27 | 2006-07-03 | 주식회사 포스코 | Hot dipping apparatus and method |
| CN103160764A (en) * | 2013-03-25 | 2013-06-19 | 冷水江钢铁有限责任公司 | Single-side continuous hot zinc-plating method for composite strip steel |
| KR20150073299A (en) * | 2013-12-20 | 2015-07-01 | 주식회사 포스코 | Method for manufacturing zinc coated steel sheet having excellent coating adhesion and zinc coated steel sheet produced using the same |
| CN111485188A (en) * | 2020-04-02 | 2020-08-04 | 鞍钢股份有限公司 | Method for improving surface platability of high-strength steel plate by adopting pre-oxidation technology |
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