CN113802079A - Method for producing aluminum-plated silicon steel strip with high surface quality - Google Patents
Method for producing aluminum-plated silicon steel strip with high surface quality Download PDFInfo
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- CN113802079A CN113802079A CN202110946220.3A CN202110946220A CN113802079A CN 113802079 A CN113802079 A CN 113802079A CN 202110946220 A CN202110946220 A CN 202110946220A CN 113802079 A CN113802079 A CN 113802079A
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 106
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 88
- 239000010959 steel Substances 0.000 claims abstract description 88
- 238000000137 annealing Methods 0.000 claims abstract description 36
- 238000004140 cleaning Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000007747 plating Methods 0.000 claims abstract description 27
- 238000005097 cold rolling Methods 0.000 claims abstract description 20
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005554 pickling Methods 0.000 claims abstract description 7
- 239000003595 mist Substances 0.000 claims abstract description 6
- 239000000839 emulsion Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 29
- 238000005096 rolling process Methods 0.000 claims description 23
- 230000001680 brushing effect Effects 0.000 claims description 22
- 239000001257 hydrogen Substances 0.000 claims description 20
- 229910052739 hydrogen Inorganic materials 0.000 claims description 20
- 239000003513 alkali Substances 0.000 claims description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 12
- 238000010583 slow cooling Methods 0.000 claims description 7
- 230000000740 bleeding effect Effects 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 abstract description 12
- 230000008025 crystallization Effects 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 11
- 230000003746 surface roughness Effects 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 description 37
- 229910052782 aluminium Inorganic materials 0.000 description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 36
- 239000011248 coating agent Substances 0.000 description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 239000013078 crystal Substances 0.000 description 19
- 239000007788 liquid Substances 0.000 description 13
- 239000002253 acid Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 238000005253 cladding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000008237 rinsing water Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002436 steel type 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
- 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
-
- 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
- B21B1/24—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 in a continuous or semi-continuous process
- B21B1/28—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 in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
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- 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
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- 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
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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
- 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
- C23C2/12—Aluminium or alloys based thereon
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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
- 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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a method for producing an aluminum-plated silicon steel strip with high surface quality, belonging to the technical field of continuous hot-dip aluminum-silicon plating. The method for producing the aluminum-plated silicon steel strip with high surface quality comprises the steps of pickling, cold rolling, cleaning, continuous annealing, hot-dip aluminum-silicon plating and cooling, wherein the cooling comprises a pre-cooling section and a strong cooling section, the temperature of the strip steel in the pre-cooling section is cooled to 620-630 ℃ through a pre-cooling fan, the strong cooling section comprises three strong cooling sections, the three strong cooling sections are cooled by water mist, and the cooling rate of the strong cooling section is controlled to be more than or equal to 30 ℃/s. The invention can effectively control the surface crystallization size of the aluminum-silicon product, reduce the typical defects of plating leakage and the like and produce the high-surface aluminum-plated silicon steel strip by controlling the surface roughness of the steel strip, the cleaning quality, the atmosphere of the annealing furnace, the air knife parameter and the parameter of the plating layer crystallization controller.
Description
Technical Field
The invention belongs to the technical field of steel strip hot dipping aluminum silicon, and particularly relates to a method for producing an aluminum-plated silicon steel strip with high surface quality.
Background
Hot-dip aluminized sheet (Al-10 wt% Si) having excellent corrosion resistance, particularly in SO2、H2S、CO2The corrosiveness of industrial atmosphere, marine atmosphere and humid environment; has high temperature oxidation resistance and can be used for a long time below 500 ℃; the paint has silvery white luster and light and heat reflectivity, can still reflect 80 percent of radiant energy at the temperature of 500 ℃, and has the surface temperature lower than that of stainless steel by 90 ℃ under the same illumination condition; meanwhile, the coating has good weather resistance, carburization resistance, wear resistance and the like. The hot dip aluminum-plated steel sheet has the above characteristics, and is widely used in various fields such as automobiles, home appliances, buildings, petrochemical industry, metallurgy, machinery, light industry, electric power, solar energy and the like. Wherein, the automobile is mainly used for manufacturing automobile silencers and passenger car bottom floorsThe plate, the embossed inner panel and the 1500 MPa-level hot-press formed ultrahigh-strength automobile plate; the household appliance is mainly used as a box plate of household appliance products such as various ovens, dryers, air conditioners and the like; the paint is mainly used as unpainted roofing corrugated board of metal buildings and the like in construction.
The production process of the hot dip aluminum-plated steel plate mainly comprises the following steps: the method comprises the steps of pickling, cold rolling, cleaning, continuous annealing, hot-dip aluminum silicon plating, cooling, finishing and straightening, but because of the limitation of a production process, the obtained plated aluminum plate has thick surface coating crystal patterns, and the crystal size of the surface coating reaches more than 7mm, so that the attractiveness of a product is influenced, the corrosion resistance of the plated aluminum plate is reduced, the service life of the plated aluminum plate is shortened, the quality of the produced steel strip is directly degraded, and the requirements of high-surface customers cannot be met. At present, in the prior art, the grain size of the plating layer on the surface of an aluminum plate is mainly refined by the following two ways: firstly, through adding certain rare earth elements, Ti, B and other alloy elements, the coating can form more crystal cores to refine the coating structure in the solidification and crystallization process, but the method can cause the corrosion resistance of the coating on the surface of the steel plate to be reduced; secondly, a method of accelerating cooling speed after aluminum plating is adopted to promote more crystal cores to be formed in the plating layer, so that the structure of the plating layer is refined, but the refining effect on crystal grains is limited.
For example, chinese patent application No. 202010540016.7 discloses a production process of hot-dip aluminum-plated silicon steel sheet, which optimizes the cooling method after aluminum plating, thereby refining the crystal grains of the plating layer to some extent. Specifically, the method adopts a double-pass cooling process: the first-pass cooling is spray cooling, metal powder with excellent heat conductivity is sprayed on the surface of the strip steel after the strip steel is taken out of the boiler, the cooling of the surface coating is accelerated at a cooling speed of 60-100 ℃/s, and the strip steel is cooled to a temperature of less than or equal to 450 ℃; and the second cooling is strong wind cooling, the surface of the strip steel is sprayed with strong wind for cooling at the cooling speed of 5-30 ℃/s until the surface temperature of the strip steel is cooled to be less than or equal to 300 ℃ at a tower top roller.
Disclosure of Invention
1. Problems to be solved
The invention aims to overcome the defect that the surface quality of the aluminized silicon steel strip is influenced by the fact that the grain size of the surface coating of the aluminized silicon steel strip produced by the existing process is large, and provides a method for producing the aluminized silicon steel strip with high surface quality. The invention can effectively reduce the crystal size of the plating layer to be less than or equal to 2mm through process optimization, thereby ensuring the surface quality of the aluminum-plated silicon steel strip and meeting the requirements of high-requirement customers.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the method for producing the aluminum-plated silicon steel strip with high surface quality comprises the steps of pickling, cold rolling, cleaning, continuous annealing, hot-dip aluminum-silicon plating and cooling, wherein the cooling comprises a pre-cooling section and a strong cooling section, the temperature of the strip steel in the pre-cooling section is cooled to 620-630 ℃ through a pre-cooling fan, the strong cooling section comprises three strong cooling sections, the three strong cooling sections are cooled by water mist, and the cooling rate of the strong cooling section is controlled to be more than or equal to 30 ℃/s. By optimizing the cooling process, the solidification time of the coating can be effectively shortened, so that the crystal grains do not have sufficient time to grow, and the crystal grain size of the coating can be reduced. Designing three sections of strong cooling fans, mainly considering different thicknesses of strip steel, namely, when the thick strip steel passes through the first section of the strong cooling fan, immediately starting the second section of the strong cooling fan when the detection temperature of a pyrometer T3 is higher than 550 ℃, and immediately starting the third section of the strong cooling fan until the detection temperature of a pyrometer T5 is lower than 550 ℃ if the detection temperature of a pyrometer T4 is still higher than 550 ℃; secondly, when the thin strip steel passes through the first section of the strong cooling fan, the temperature detected by the pyrometer T3 is lower than 550 ℃, and the second section and the third section of the strong cooling fan do not need to be started at the moment, so that the aim of saving energy consumption of the strip steel with different thicknesses is fulfilled.
Furthermore, the air volume of the precooling fan is controlled to be 800-1200 m3Min, the flow rate of each stage of forced cooling is 1800-2200 m3The water injection amount is 20-50 kg/h.
Furthermore, the cold rolling adopts a five-frame continuous rolling process, wherein the roughness of the rollers of F1-F4 frames is Ra0.7, and the roughness of the rollers of F5 frames is Ra5.0.
The conventional cold rolling mill F5 for the aluminum-plated silicon steel strip generally adopts rollers with the roughness of Ra2.5-3.0, and the surface roughness of the rolled hard steel strip is only Ra0.3-0.8 mu m, and compared with the conventional Ra2.5-3.0 rollers, the invention adopts the F5 roller with the high roughness of Ra5.0, so that the friction force between the strip steel and the rollers can be effectively increased, the strip steel is more stable in the rolling process, and the deviation is avoided; on the other hand, more importantly, the roughness of the surface of the rolled hard steel strip can be effectively improved to Ra being more than or equal to 1.2 mu m, the size of concave-convex peaks and the protrusion distance of the surface of the steel strip are further increased from the microscopic level, through the matching of the F5 rack large roughness roller and the cooling process, the later-stage coating preferentially generates a large number of crystal nuclei at the protrusion positions during the rapid cooling in the crystallization process, the crystallization number on the unit area is increased, then the temperature is reduced to be below the crystallization temperature of aluminum liquid in a very short time, the crystallization of the coating is not too long, the size of the single coating can be effectively reduced, the crystal grains of the surface coating are refined, and therefore, the purpose of effectively reducing the surface crystallization size of the coating can be realized compared with the optimization of a simple cooling process.
Furthermore, the plate shape and the surface roughness of the hard rolled steel strip can be stably controlled by controlling the cold rolling speed to be 600-1200 mpm.
Furthermore, the steel plate is subjected to hot-dip aluminum-silicon plating treatment and then is blown by adopting an air knife, the angle of a knife lip of the air knife is controlled to be-2 degrees, the gap between the knife lips is 1.4-1.6 mm, and the pressure of the air knife is 100-200 mbar. By controlling the technological parameters of air knife blowing, the aluminum liquid can be ensured not to splash and the knife lip can not be nodulated, plating leakage caused by plating oxidation can be reduced, defects such as moire can be effectively controlled, and better surface quality can be ensured.
Furthermore, in the cold rolling process, the concentration of emulsion of an F1-F4 frame is controlled to be 1.5-3.5%, the flow rate of the emulsion is more than or equal to 4000L/min, the concentration of emulsion of an F5 frame is controlled to be 0.4-0.8%, the flow rate of the emulsion is more than or equal to 6000L/min, the temperature of the emulsion is 50-60 ℃, the pH value is 4.0-6.5, the outlet blowing pressure of the F5 frame is 0.6-0.8 MPa, and the number of flat nozzles is more than or equal to 5/m.
The invention can realize the full and stable lubrication in the rolling process on one hand by precisely controlling the concentration, flow, temperature and the like of the emulsion,thereby stabilizing the surface roughness of the steel strip; on the other hand, the roughness of the roller of the F5 rack is Ra5.0, the surface appearance of the rolled steel strip is uneven, so that iron powder and lubricating grease in the emulsion are easy to remain on the surface of the steel strip, and the total amount of residual oil and residual iron on the surface of the steel strip even reaches 800-1200 mg/m2The method has the advantages that the concentration, the flow, the temperature and the like of emulsion used in the rolling process are optimized, and the cooperation of F5 rack outlet purging pressure is assisted, so that on one hand, the thick steel strip can be fully lubricated in the rolling process with high reduction rate, and stable rolling is realized; on the other hand, the residual iron powder and the emulsion on the surface of the hard rolled steel strip can be effectively reduced, so that the residual iron on the surface of the hard rolled steel strip is reduced to 600-800 mg/m2The two sides ensure the stable operation of the coating process; and simultaneously, the content of the lubricating grease in unit area can be reduced as much as possible.
Furthermore, the cleaning procedure comprises an alkali spray washing section, electrolytic washing, mechanical brushing and water rinsing, wherein the conductivity of the alkali spray washing is controlled to be 60-80 ms/cm, the temperature is controlled to be 75 +/-5 ℃, the conductivity of the electrolytic washing is controlled to be 70-90 ms/cm, the temperature is controlled to be 85 +/-5 ℃, the conductivity of the water rinsing is less than or equal to 50 mu s/cm, the rinsing temperature is 70 +/-10 ℃, and the drying temperature is more than or equal to 80 ℃; the mechanical brushing comprises an alkali brushing and a water brushing.
The inventor finds out through a large number of experiments that the alkali spray washing section can increase the activity of alkali liquor by using higher conductivity and higher temperature, better soak and emulsify residual oil, and the spray washing process increases the effect of cleaning residual oil and residual iron land; the electrolytic cleaning section can increase the transfer activity of anions and cations in the electrolytic process by using higher conductivity and higher temperature, and the effect of electrolytically cleaning iron powder on the surface of the steel strip is increased; the device is provided with two mechanical brushing devices, and mainly aims to remove residual oil and residual iron on the surface of the strip steel more deeply after the strip steel is soaked in alkali washing and then is brushed by alkali, and the water brushing mainly comprises the step of mechanically cleaning iron powder loosened on the surface of the strip steel after electrolysis; the rinsing tank uses pure desalted water, the cleanliness of rinsing water can be effectively controlled due to low conductivity, residual moisture on the surface of the strip steel can be effectively dried due to high drying temperature, and water stain is prevented from being brought into the annealing furnace to influence the atmosphere in the annealing furnace. The cleaning process and the rolling process are matched, so that the residual oil and iron on the surface of the hard rolled steel strip can be further removed and reduced.
Furthermore, the pressure in the continuous annealing furnace is controlled to be 200-300 Pa, and the flow of the nitrogen-hydrogen mixture is more than or equal to 1500m3H, the opening degree of a furnace top bleeding valve is more than or equal to 30 percent; the dew point in the annealing furnace is less than-40 ℃. The annealing furnace is kept at a higher pressure, the pressure difference between the annealing furnace and the external environment is increased, the atmosphere in the annealing furnace can be effectively isolated from the external environment, and external oxygen is difficult to enter the annealing furnace; the high-flow nitrogen injection and the furnace top bleeding valve are opened, so that the furnace atmosphere can be replaced, and the extremely low oxygen content and the extremely low dew point in the furnace are ensured.
Furthermore, the hydrogen content of the fast cooling section and the slow cooling section in the continuous annealing furnace is controlled to be 8-10 percent, the hydrogen content of other areas is controlled to be 5-7 percent, the oxygen content of the furnace nose area is controlled to be less than or equal to 5ppm, and pure nitrogen is introduced to be more than or equal to 250m3H; controlling the oxygen content in other areas to be less than or equal to 10 ppm; the temperature of the heating section and the soaking section is controlled to be 750-820 ℃, the outlet temperature of the fast cooling section is controlled to be 620-710 ℃, and the speed of the strip steel is more than or equal to 80 mpm.
The hydrogen content of the fast cooling section and the slow cooling section is controlled to be higher through difference, the atmosphere in the furnace is effectively controlled to be in a high reduction state, elements such as Si, Mn and the like in the steel strip are prevented from being oxidized after being separated out on the surface of the steel strip through high-temperature annealing, the platability of the steel strip is improved, and the plating leakage defect is avoided; the furnace nose belongs to a small space, and H can be avoided by injecting large-flow pure nitrogen2The compound generated by the reaction with the aluminum liquid reduces the platability of the steel strip. Different annealing temperatures are selected according to different steel types to realize full annealing; the heat balance of the aluminum pot can be controlled by controlling the outlet temperature of the quick cooling section, the opening times of an aluminum pot sensor are reduced, and the energy consumption is reduced; and the surface quality of the coated steel strip can be effectively controlled to be better by controlling the speed of the steel strip to be more than or equal to 80 mpm.
Furthermore, when the cooling treatment and the finishing treatment are carried out, the elongation of the finishing machine is controlled to be 1.4-1.7%, and the rolling force is not less than 4000 KN. By large extension and large rolling force finishing, the coating crystal grains with larger local size can be crushed to a certain extent, and the crystal size on the surface of the steel strip is reduced.
Drawings
FIG. 1 is a process flow diagram of an acid rolling unit and a galvanizing unit;
FIG. 2 is a schematic view of a device for controlling the crystal size of a plated layer.
In the figure:
Detailed Description
When the existing process is adopted to produce the aluminum-silicon steel strip, the surface roughness of the rolled hard coil steel strip is usually Ra0.3-0.8 mu m, the rolled hard coil steel strip is subjected to conventional cleaning, then the rolled hard coil steel strip enters a continuous annealing furnace, hot dipping, air knife and air cooling, the aluminum-silicon coating on the surface of the steel strip is solidified, the crystal size of the coating on the surface of the produced aluminum-silicon steel strip is usually more than 7mm, plating leakage defects are frequently generated (5-10/100 m), the quality degradation of the produced steel strip is directly caused, and the requirements of high-surface customers cannot be met. The invention can effectively reduce the crystallization size of the surface of the coating by process optimization, particularly by the common cooperation of cooling and rolling processes, and particularly, in the cooling process, a precooling fan is used for cooling the aluminum-silicon coating to 620-630 ℃, and then a strong cooling fan (one section, two sections and three sections) is used for blowing air containing water mist to rapidly cool the aluminum coating to below 550 ℃ so as to finish the crystallization process of the coating; during the cladding material cools off fast, on the one hand because water smoke cooling rate is very fast, the cladding material crystallization does not have sufficient time to grow up, can reduce single cladding material crystal size, on the other hand because steel band surface roughness is higher, steel band surface microcosmic appearance high point interval is great, can make the high point region temperature be less than cladding material condensation point nucleation earlier, thereby produce the more crystal nucleus of quantity, increase the crystallization quantity in the unit area, reduce single cladding material crystal size, thereby stably realize that cladding material crystal size is less than or equal to 2 mm.
However, when the F5 frame adopts a high-roughness roller, iron powder and lubricating grease in the emulsion are more likely to remain on the surface of the steel strip, thereby increasing the plating leakage defect. In order to effectively prevent the occurrence of the plating leakage defect, the invention further optimizes the emulsification process and the subsequent cleaning process in the rolling process on one hand, thereby effectively removing the residual oil and the residual iron on the surface of the rolled hard steel strip, preventing the residual oil and the residual iron on the surface of the steel strip from gathering to influence the platability and avoiding the generation of the plating leakage defect; and on the other hand, the air knife blowing process and the continuous annealing process are optimized, so that the plating leakage defect can be effectively reduced to 1-2/1000 m. Specifically, the hydrogen content of the fast cooling section and the slow cooling section (8-10%) and the hydrogen content of the heating section and the soaking section (5-7%) of the annealing furnace are controlled to be higher through difference, the whole atmosphere in the furnace is effectively controlled to be in a high reduction state, elements such as Si, Mn and the like in the components of the steel strip are prevented from being oxidized after being precipitated on the surface of the steel strip through high-temperature annealing, the platability of the steel strip is improved, and the plating leakage defect of the steel strip in the hot dip aluminum silicon plating process can be effectively reduced. The high-flow pure nitrogen is introduced through controlling the furnace nose, so that on one hand, the low oxygen content (less than or equal to 5ppm) of the gas in the furnace nose can be effectively ensured, on the other hand, the hydrogen content can be effectively reduced, and the defect of plating leakage caused by the adhesion of a compound generated by the reaction of hydrogen and aluminum liquid to the surface of a steel strip is prevented.
The invention is further described with reference to specific examples.
Example 1
As shown in fig. 1, the method for producing an aluminum-plated silicon steel strip with high surface quality according to the present embodiment includes the following steps:
(1) acid pickling
(2) Cold rolling
The hot rolled steel strip is subjected to continuous rolling through five frames of F1, F2, F3, F4 and F5 after acid cleaning, wherein the roughness of the rollers of the frames of F1-F4 is Ra0.7, the roughness of the rollers of the frames of F5 is Ra5.0, the cold rolling speed is controlled to be 600mpm, and the surface roughness Ra of the rolled hard steel strip after continuous rolling is 1.2 mu m.
In the cold rolling process, emulsion is supplied to five racks F1, F2, F3, F4 and F5 from three emulsion boxes, wherein the racks F1-F4 are supplied from S1 or S2 boxes, the racks F5 are supplied from S3 boxes independently, the emulsion concentration of the racks F1-F4 is controlled to be 1.5%, the emulsion flow is 4000L/min, the emulsion concentration of the racks F5 is 0.8%, the emulsion flow is 6000L/min, the emulsion temperature is 50 ℃, the pH value is 4.0, the outlet blowing pressure of the racks F5 is 0.6MPa, and 5 flat nozzles are arranged at 5/m.
(3) Cleaning of
The cleaning procedure comprises an alkali spray cleaning section, electrolytic cleaning, mechanical brushing and water rinsing, wherein the conductivity of the alkali spray cleaning is controlled to be 73ms/cm, the temperature is controlled to be 75 ℃, the conductivity of the electrolytic cleaning is controlled to be 78ms/cm, the temperature is controlled to be 84 ℃, the conductivity of the water rinsing is controlled to be 47 mu s/cm, the rinsing temperature is 70 ℃, and the drying temperature is controlled to be 90 ℃; the mechanical brushing comprises an alkali brushing and a water brushing.
(4) Continuous annealing
The pressure in the continuous annealing furnace is controlled to be 200Pa, and the flow of the nitrogen-hydrogen mixture is controlled to be 1500m3H, the opening degree of a furnace top bleeding valve is 30 percent; the dew point in the annealing furnace is-42 ℃. Controlling the hydrogen content of the fast cooling section and the slow cooling section in the continuous annealing furnace to be 8 percent, the hydrogen content of other areas to be 5 percent, the oxygen content of the furnace nose area to be less than or equal to 5ppm, and introducing pure nitrogen gas of 250m3H; controlling the oxygen content in other areas to be less than or equal to 10 ppm; the temperature of the heating section and the soaking section is controlled to be 750 ℃, the outlet temperature of the fast cooling section is controlled to be 620 ℃, and the speed of the strip steel is 80 mpm.
(5) Hot-dip aluminum-silicon coating
Firstly, controlling the temperature of strip steel before entering an aluminum pot (T1) to ensure that the temperature of the aluminum pot is at a higher position (about 650 ℃), then steering the running strip steel through a sink roll in the aluminum pot filled with liquid aluminum, and blowing by adopting an air knife, controlling the angle of a knife lip of the air knife to be-2 degrees, the gap of the knife lip to be 1.4mm, and controlling the pressure of the air knife to be 100 mbar.
(6) Cooling treatment
Referring to fig. 2, after being blown by the air knife device, the aluminum coating adhered to the surface of the steel strip is in a liquid state and does not start to crystallize, at this time, the steel strip adhered with the liquid aluminum coating passes through the pre-cooling fan, the temperature of the steel strip is cooled to 620 ℃, and the air volume of the pre-cooling fan is 1000m3And/min, spraying water-containing mist cooling air to the surface of the aluminum coating which is passing through the air box by strong cooling fans (one section, two sections and three sections), wherein each strong cooling fan is made of stainless steel and is provided with a flat nozzle, the cooling rate of the strong cooling section is controlled to be 30 ℃/s, and the flow of each strong cooling section is 2000m3The water injection amount is 35 kg/min.
(7) Finishing machine
When the finishing treatment is carried out after the cooling treatment, the elongation of the finishing machine is controlled to be 1.4 percent, and the rolling force is 4000 KN.
Example 2
As shown in fig. 1, the method for producing an aluminum-plated silicon steel strip with high surface quality according to the present embodiment includes the following steps:
(1) acid pickling
(2) Cold rolling
After acid cleaning, the hot rolled steel strip is subjected to continuous rolling by five frames F1, F2, F3, F4 and F5, wherein the roughness of the rollers of the frames F1-F4 is Ra0.7, the roughness of the rollers of the frames F5 is Ra5.0, the cold rolling speed is controlled to be 800mpm, and the surface roughness Ra of the rolled hard steel strip after continuous rolling is 1.4 mu m.
In the cold rolling process, emulsion is supplied to five racks F1, F2, F3, F4 and F5 from three emulsion boxes, wherein the racks F1-F4 are supplied from S1 or S2 boxes, the racks F5 are supplied from S3 boxes independently, the emulsion concentration of the racks F1-F4 is controlled to be 2.7%, the emulsion flow is 4200L/min, the emulsion concentration of the racks F5 is 0.6%, the emulsion flow is 6500L/min, the emulsion temperature is 55 ℃, the PH value is 4.8, the outlet blowing pressure of the racks F5 is 0.7MPa, and the number of flat nozzles is 6/m.
(3) Cleaning of
The cleaning procedure comprises an alkali spray washing section, electrolytic washing, mechanical brushing and water rinsing, wherein the conductivity of the alkali spray washing is controlled to be 80ms/cm, the temperature is 80 ℃, the conductivity of the electrolytic washing is 90ms/cm, the temperature is 90 ℃, the conductivity of the water rinsing is 50 mu s/cm, the rinsing temperature is 80 ℃, and the drying temperature is 80 ℃; the mechanical brushing comprises an alkali brushing and a water brushing.
(4) Continuous annealing
The pressure in the continuous annealing furnace is controlled to be 300Pa, and the flow of the nitrogen-hydrogen mixture is controlled to be 1600m3H, opening degree of a furnace top bleeding valve is 35 percent; the dew point in the annealing furnace is-42 ℃. Controlling the hydrogen content of the fast cooling section and the slow cooling section in the continuous annealing furnace to be 10 percent, the hydrogen content of other areas to be 7 percent, the oxygen content of the furnace nose area to be less than or equal to 5ppm, and introducing pure nitrogen gas 265m3H; controlling the oxygen content in other areas to be less than or equal to 10 ppm; the temperature of the heating section and the soaking section is controlled to be 820 ℃, the outlet temperature of the fast cooling section is 710 ℃, and the speed of the strip steel is 83 mpm.
(5) Hot-dip aluminum-silicon coating
Firstly, controlling the temperature of strip steel before entering an aluminum pot (T1) to ensure that the temperature of the aluminum pot is at a higher position (about 650 ℃), then steering the running strip steel through a sink roll in the aluminum pot filled with liquid aluminum, and blowing by adopting an air knife, controlling the angle of a knife lip of the air knife to be-2 degrees, the gap of the knife lip to be 1.6mm, and controlling the pressure of the air knife to be 200 mbar.
(6) Cooling treatment
After the aluminum coating adhered to the surface of the steel strip is sprayed by the air knife device, the aluminum coating is in a liquid state and does not start to crystallize, the steel strip adhered with the liquid aluminum coating passes through a precooling fan, the temperature of the steel strip is cooled to 630 ℃, and the air volume of the precooling fan is 1200m3And/min, spraying water-containing fog cooling air to the surface of the aluminum coating which is passing through the air box through strong cooling fans (one section, two sections and three sections, only one section of strong cooling fan needs to be started), wherein each strong cooling fan is made of stainless steel and is provided with a flat nozzle, the cooling rate of the strong cooling section is controlled to be 35 ℃/s, and the flow rate of each strong cooling section is 2200m3The water injection amount is 50 kg/min.
(7) Finishing machine
When the steel sheet is subjected to the finishing treatment after the cooling treatment, the elongation of the finishing machine is controlled to be 1.7%, and the rolling force is 4200 KN.
Example 3
As shown in fig. 1, the method for producing an aluminum-plated silicon steel strip with high surface quality according to the present embodiment includes the following steps:
(1) acid pickling
(2) Cold rolling
After acid cleaning, the hot rolled steel strip is subjected to continuous rolling by five frames F1, F2, F3, F4 and F5, wherein the roughness of the rollers of the frames F1-F4 is Ra0.7, the roughness of the rollers of the frames F5 is Ra5.0, the cold rolling speed is controlled to be 1200mpm, and the surface roughness Ra of the rolled hard steel strip after continuous rolling is 1.5 mu m.
In the cold rolling process, emulsion is supplied to five racks F1, F2, F3, F4 and F5 from three emulsion boxes, wherein the racks F1 to F4 are supplied from an S1 or S2 box, the racks F5 are independently supplied from an S3 box, the emulsion concentration of the racks F1 to F4 is controlled to be 3.5%, the emulsion flow is 5200L/min, the emulsion concentration of the racks F5 is 0.5%, the emulsion flow is 6700L/min, the emulsion temperature is 60 ℃, the pH value is 6.5, the outlet blowing pressure of the racks F5 is 0.8MPa, and 7 flat nozzles are arranged at each m.
(3) Cleaning of
The cleaning procedure comprises an alkali spray cleaning section, electrolytic cleaning, mechanical brushing and water rinsing, wherein the conductivity of the alkali spray cleaning is controlled to be 60ms/cm, the temperature is controlled to be 70 ℃, the conductivity of the electrolytic cleaning is controlled to be 70ms/cm, the temperature is controlled to be 80 ℃, the conductivity of the water rinsing is controlled to be 45 mu s/cm, the rinsing temperature is 60 ℃, and the drying temperature is 86 ℃; the mechanical brushing comprises an alkali brushing and a water brushing.
(4) Continuous annealing
The pressure in the continuous annealing furnace is controlled to be 240Pa, and the flow of the nitrogen-hydrogen mixture is controlled to be 1570m3H, opening degree of a furnace top bleeding valve is 35 percent; the dew point in the annealing furnace is-45 ℃. Controlling the hydrogen content of the fast cooling section and the slow cooling section in the continuous annealing furnace to be 9 percent, the hydrogen content of other areas to be 6 percent, the oxygen content of the furnace nose area to be less than or equal to 5ppm, and introducing pure nitrogen gas of 300m3H; controlling the oxygen content in other areas to be less than or equal to 10 ppm; the temperature of the heating section and the soaking section is controlled to be 800 ℃, the outlet temperature of the fast cooling section is 690 ℃, and the speed of the strip steel is 88 mpm.
(5) Hot-dip aluminum-silicon coating
Firstly, controlling the temperature of strip steel before entering an aluminum pot (T1) to ensure that the temperature of the aluminum pot is at a higher position (about 650 ℃), then steering the running strip steel through a sink roll in the aluminum pot filled with liquid aluminum, and blowing by adopting an air knife, controlling the angle of a knife lip of the air knife to be-2 degrees, the gap of the knife lip to be 1.5mm, and controlling the pressure of the air knife to be 170 mbar.
(6) Cooling treatment
After the aluminum coating adhered to the surface of the steel strip is sprayed by the air knife device, the aluminum coating is in a liquid state and does not start to crystallize, the steel strip adhered with the liquid aluminum coating passes through a precooling fan, the temperature of the steel strip is cooled to 626 ℃, and the air volume of the precooling fan is 800m3And/min, spraying water-containing mist cooling air to the surface of the aluminum coating which is passing through the air box by strong cooling fans (one section, two sections and three sections), wherein each strong cooling fan is made of stainless steel and is provided with a flat nozzle, the cooling rate of the strong cooling section is controlled to be 42 ℃/s, and the flow of each strong cooling section is 1800m3The water injection amount is 20 kg/min.
(7) Finishing machine
When the cooling treatment and the finishing treatment are carried out, the elongation of the finishing machine is controlled to be 1.5 percent, and the rolling force is 4170 KN.
Claims (10)
1. A method for producing high surface quality aluminized silicon steel strip includes pickling, cold rolling, cleaning, continuous annealing, hot dipping aluminum-silicon plating and cooling treatment, and is characterized in that: the cooling comprises a pre-cooling section and a strong cooling section, wherein the pre-cooling section is used for cooling the strip steel to 620-630 ℃ through a pre-cooling fan, the strong cooling section comprises three sections of strong cooling, the three sections of strong cooling are cooled by water mist, and the cooling rate of the strong cooling section is controlled to be more than or equal to 30 ℃/s.
2. A method for producing a high surface quality aluminized silicon steel strip according to claim 1, characterized in that: controlling the air quantity of the precooling fan to be 800-1200 m3Min, the flow rate of each stage of forced cooling is 1800-2200 m3The water injection amount is 20-50 kg/h.
3. A method for producing a high surface quality aluminized silicon steel strip according to claim 1, characterized in that: the cold rolling adopts a five-frame continuous rolling process, wherein the roughness of the rollers of F1-F4 frames is Ra0.7, and the roughness of the rollers of F5 frames is Ra5.0.
4. A method for producing a high surface quality aluminized silicon steel strip according to claim 3, characterized in that: and controlling the cold rolling speed to be 600-1200 mpm.
5. A method for producing high surface quality aluminized silicon steel strip according to any one of claims 1 to 4, characterized in that: and (3) carrying out hot-dip aluminum-silicon plating on the steel plate, and then blowing by adopting an air knife, wherein the angle of a knife lip of the air knife is controlled to be-2 degrees, the gap of the knife lip is controlled to be 1.4-1.6 mm, and the pressure of the air knife is 100-200 mbar.
6. A method for producing high surface quality aluminized silicon steel strip according to any one of claims 1 to 4, characterized in that: in the cold rolling process, the concentration of emulsion of an F1-F4 frame is controlled to be 1.5-3.5%, the flow rate of the emulsion is more than or equal to 4000L/min, the concentration of emulsion of an F5 frame is controlled to be 0.4-0.8%, the flow rate of the emulsion is more than or equal to 6000L/min, the temperature of the emulsion is 50-60 ℃, the pH value is 4.0-6.5, and the outlet blowing pressure of the F5 frame is 0.6-0.8 Mpa.
7. A method for producing a high surface quality aluminized silicon steel strip according to claim 6, characterized in that: the cleaning process comprises an alkali spray washing section, electrolytic washing, mechanical brushing and water rinsing, wherein the conductivity of the alkali spray washing is controlled to be 60-80 ms/cm, the temperature is controlled to be 75 +/-5 ℃, the conductivity of the electrolytic washing is controlled to be 70-90 ms/cm, the temperature is controlled to be 85 +/-5 ℃, the conductivity of the water rinsing is not more than 50 mu s/cm, the rinsing temperature is 70 +/-10 ℃, and the drying temperature is not less than 80 ℃; the mechanical brushing comprises an alkali brushing and a water brushing.
8. A method for producing high surface quality aluminized silicon steel strip according to any one of claims 1 to 4, characterized in that: controlling the pressure in the continuous annealing furnace to be 200-300 Pa, and controlling the flow of the nitrogen-hydrogen mixture to be more than or equal to 1500m3H, the opening degree of a furnace top bleeding valve is more than or equal to 30 percent; the dew point in the annealing furnace is less than-40 ℃.
9. A method for producing a high surface quality aluminized silicon steel strip according to claim 8, characterized in that: controlling the hydrogen content of the fast cooling section and the slow cooling section in the continuous annealing furnace to be 8-10 percent, the hydrogen content of other areas to be 5-7 percent, the oxygen content of the furnace nose area to be less than or equal to 5ppm, and introducing pure nitrogen to be more than or equal to 250m3H; controlling the oxygen content in other areas to be less than or equal to 10 ppm; the temperature of the heating section and the soaking section is controlled to be 750-820 ℃, the outlet temperature of the fast cooling section is controlled to be 620-710 ℃, and the speed of the strip steel is more than or equal to 80 mpm.
10. A method for producing high surface quality aluminized silicon steel strip according to any one of claims 1 to 4, characterized in that: when the finishing treatment is carried out after the cooling treatment, the elongation of the finishing machine is controlled to be 1.4-1.7 percent, and the rolling force is not less than 4000 KN.
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Effective date of registration: 20240513 Address after: 230000 Hefei Circular Economy Demonstration Park, Feidong County, Hefei City, Anhui Province, China, Jingliu Road East and Weiwu Road South Applicant after: MAGANG Group HOLDING COMPANY L Country or region after: China Address before: 231600 East Jingliu road and South Weiwu Road, Hefei Circular Economy Demonstration Park, Anhui Province Applicant before: MAGANG (HEFEI) SHEET Co.,Ltd. Country or region before: China |