CN117448545A - Production process of hot-dip aluminum-zinc-silicon steel plate with thickness of 2.5-3.0mm - Google Patents

Production process of hot-dip aluminum-zinc-silicon steel plate with thickness of 2.5-3.0mm Download PDF

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Publication number
CN117448545A
CN117448545A CN202311384295.2A CN202311384295A CN117448545A CN 117448545 A CN117448545 A CN 117448545A CN 202311384295 A CN202311384295 A CN 202311384295A CN 117448545 A CN117448545 A CN 117448545A
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zinc
hot
silicon steel
temperature
scraper
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孙朝勇
赵永科
高士伟
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Priority to CN202311384295.2A priority Critical patent/CN117448545A/en
Publication of CN117448545A publication Critical patent/CN117448545A/en
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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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/0226—Hot rolling
    • 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation 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
    • C23C2/04—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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/22—Removing excess of molten coatings; Controlling or regulating the coating thickness by rubbing, e.g. using knives, e.g. rubbing solids
    • 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
    • C23C2/325—Processes or devices for cleaning the bath
    • 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
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • 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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Abstract

The invention provides a production process of a hot-dip aluminum-zinc-silicon steel plate with the thickness of 2.5-3.0mm, belongs to the technical field of hot-dip aluminum-zinc-silicon steel plate production, and solves the problems that hot-dip aluminum-zinc-silicon steel plates with the thickness of more than 2.5mm produced by the existing process have larger zinc slag and zinc spangles on the surface of strip steel, and the production process comprises the following steps: firstly, hot rolling a raw material plate, and removing iron scales on the surface of a steel coil through pickling after hot rolling; rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling; degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating; and finally, cooling, carrying out aftertreatment, carrying out winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate. The invention solves the problems of larger zinc slag and zinc flower plating on the surface of the prepared steel plate, and ensures the stable production of finished products with good quality.

Description

Production process of hot-dip aluminum-zinc-silicon steel plate with thickness of 2.5-3.0mm
Technical Field
The invention belongs to the technical field of production of hot-dip aluminum-zinc-silicon steel plates, and particularly relates to a production process of a hot-dip aluminum-zinc-silicon steel plate with the thickness of 2.5-3.0 mm.
Background
The hot-dip aluminum-zinc-silicon steel plate is a pre-plated steel material obtained by taking cold-rolled steel plates with various strength and thickness specifications as base materials and hot-plating one Al-Zn plating layer on two surfaces. The plating layer component combines the physical protection, high durability and electrochemical protection characteristics of Zn of Al, has high decorative bright silver gray color and regular patterns on the surface, has relief sense, has the advantages of formability, heat resistance, high reflectivity and the like, and is widely applied in the industrial production process due to the unique physical and chemical characteristics of the hot-dip aluminum-zinc-silicon steel plate. However, the thickness of the steel plate produced by the conventional hot dip aluminum-zinc-silicon machine set is concentrated at 0.3-2.0mm, the thickness is generally not more than 2.5mm, and the technical problems of larger zinc slag and zinc flower on the surface of strip steel mainly exist in the production of hot dip aluminum-zinc-silicon steel plate with the thickness of more than 2.5mm, so that no effective solution exists in the coating industry at present.
Disclosure of Invention
The invention aims to provide a production process of a hot-dip aluminum-zinc-silicon steel plate with the thickness of 2.5-3.0mm, which aims to solve the problems of larger zinc slag and zinc flower on the surface of strip steel in the production of hot-dip aluminum-zinc-silicon steel plate with the thickness of more than 2.5mm by the existing process.
The technical scheme of the invention is as follows: a production process of a hot dip aluminum zinc silicon steel plate with the thickness of 2.5-3.0mm comprises the following steps:
step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling;
step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling;
step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating;
step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
Further, in the first step, the pickling speed is more than or equal to 60mpm and is kept at a constant speed;
further, in the second step, the cold continuous rolling reduction is 50% -65%, the residual oil on the single-sided surface of the cold hard plate is less than 300mg/m, and the single-sided surface of the iron powder is less than 100 mg/m;
further, in the third step, the annealing process speed is more than or equal to 60mpm;
further, in the third step, the temperature of the zinc pot aluminum zinc silicon plating solution is 580-590 ℃, the temperature of the zinc pot is 585+/-2 ℃, the temperature of the entering plate is 530-600 ℃, the temperature of the entering plate is 540-560 ℃ during thin-specification production, the zinc pot inductor is controlled with high power, the temperature of the entering plate is 550-570 ℃ during thick-specification production, the zinc pot inductor is controlled with low power, a narrow reciprocating automatic scraper is selected as a zinc pot roller system scraper, the operation speed of the scraper is 300-600mm/min, the pressure of the scraper is 0-0.5MPa, the optimal operation speed of the scraper is 350-450mm/min, and the optimal operation pressure of the scraper is 0.4-0.5MPa;
further, in the third step, the air knife uses nitrogen medium.
In the third step, forced air cooling is adopted within the temperature range of 520-540 ℃ after coating, the cooling equipment is a movable bellows, the distance between the bellows and an air knife is less than 3 meters, the temperature of the strip steel entering the movable bellows is more than 550 ℃, and the rotating speed of a bellows fan is more than or equal to 1400rpm.
The beneficial effects of the invention are as follows: the main reasons for the generation of zinc slag defects on the surface of the hot-dip aluminum zinc silicon steel plate are zinc slag precipitation in a zinc pot, slag bonding on the surface of a zinc pot roller system (mainly a sink roller) is caused, and meanwhile, the zinc pot roller system slag bonding is seriously caused due to factors such as poor surface state of thick raw materials, low production speed, unstable temperature of the zinc pot and the like. The thick steel strip has large heat, and the galvanized spangles are obviously larger after plating, so the process method of the invention eliminates or reduces the zinc slag defect on the surface of the thick hot-dip aluminum-zinc silicon steel plate and controls the spangles on the surface of the steel strip by the following measures: 1. the pickling uniformity and the strip steel surface residue are controlled mainly in the pickling and cold rolling processes, so that the residual oil and iron on the surface of the chilled coil are effectively controlled, and the strip steel surface residue is reduced; 2. the production frequency of zinc slag is reduced through optimizing the process speed; 3. the method is characterized in that the disturbance of zinc slag in a zinc pot is relieved through optimizing the entering temperature, the process speed is controlled according to the maximum capability of an annealing furnace, slag is carried out on the roll surface of a zinc pot roll system, the temperature of a zinc pot aluminum zinc silicon plating solution is ensured to be stable through controlling the process speed, the entering plate temperature and the power of a zinc pot inductor, so that the quality of a plating layer is prevented from being abnormal, the occurrence of defects on the surface of strip steel is reduced, the entering plate temperature is determined according to the production thickness specification, the enough temperature for effective chemical reaction between the strip steel and the plating solution is ensured, meanwhile, the temperature of the zinc pot is ensured to be stable, and the power of the zinc pot inductor is controlled in stages so as to control the disturbance of the slag suspended in the zinc pot; 4. through the arrangement optimization of the production plan, the thin-thick standard production is reasonably utilized, the roll surface slag bonding is reduced, the thin-thick standard alternate production is mainly adopted when the production plan is arranged, the thin-standard production is utilized to carry out running-in and roll surface slag bonding cleaning on the zinc pot roll system, and the defect control of the thick-standard production surface zinc slag is facilitated; 5. reasonably utilizing a zinc pot roller system scraper to clean slag on the roller surface, stopping the machine every 7-10 days of production to replace the zinc pot roller system, keeping the zinc pot roller system in an optimal state, fishing the zinc pot bottom slag after stopping, and ensuring that the zinc pot bottom slag does not agglomerate by using a phi 6mm specification for a zinc leakage hole of a slag fishing device; 6. the nitrogen medium is adopted by the air knife to reduce the oxidation of the liquid surface of the zinc pot and the strip steel, improve the surface quality of the product and improve the cooling effect and efficiency of the air knife; 7. the cooling temperature after plating is adjusted to be 520-540 ℃ and a forced cooling process is adopted, so that the problem that the spangles of the thick aluminum-zinc-silicon plated product are large can be effectively solved, according to the hot-dip aluminum-zinc-silicon plated theory, the nucleation starting temperature of a plating layer is about 540 ℃, spangles are completely formed at about 430 ℃, aluminum-rich dendrites grow rapidly at 520-540, the cooling speed has a large influence on the spangles, spangles are formed in a profile when the cooling speed is about 520 ℃, and the spangles are basically fixed in size.
Compared with the existing hot-dip aluminum-zinc-silicon steel plate production technology, the invention improves the problems of larger zinc slag and zinc flower plating on the surface of the hot-dip aluminum-zinc-silicon steel plate with the thickness of 2.5-3.0mm by the matching optimization of the cold hard plate raw material control, the annealing process, the hot dip plating process and the cooling process after plating, and the production process meets the market demand and ensures the stable production of finished products with good quality.
Drawings
FIG. 1 is a figure showing the spangle effect of the finished product of example 1 of the process.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings.
Example 1,
Step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling; the pickling speed was 60mpm and kept at a constant speed.
Step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling; the rolling reduction rate of the cold continuous rolling is 50%, the residual oil on the single-sided surface of the cold hard plate is 300mg/m, and the single-sided surface of the iron powder is 100 mg/m.
Step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating; the annealing process speed is 60mpm; the temperature of the zinc pot aluminum zinc silicon plating solution is 580 ℃, the temperature of the zinc pot is 583 ℃, the temperature of the entering plate is 530 ℃, the temperature of the entering plate is 540 ℃ during thin-specification production, the temperature of the entering plate is 550 ℃ during thick-specification production, the zinc pot inductor is controlled by high power, the zinc pot inductor is controlled by low power, a narrow reciprocating automatic scraper is selected as a scraper of a zinc pot roller system, the operating speed of the scraper is 300mm/min, the pressure of the scraper is 0.2MPa, the optimal operating speed of the scraper is 350mm/min, and the optimal operating pressure of the scraper is 0.4MPa; the air knife uses nitrogen medium; after coating, forced air cooling is adopted within the temperature range of 520 ℃ of the strip steel, the cooling equipment is a movable air box, the distance between the air box and an air knife is 3 meters, the temperature of the strip steel entering the movable air box is 550 ℃, and the rotating speed of an air box fan is 1400rpm.
Step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
EXAMPLE 2,
Step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling; the pickling speed was 65mpm and kept constant.
Step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling; the rolling reduction rate of the cold continuous rolling is 58%, the residual oil on the single-sided surface of the cold hard plate is 290mg/m, and the single-sided surface of the iron powder is 90 mg/m.
Step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating; the annealing process speed is 65mpm; the temperature of the zinc pot aluminum zinc silicon plating solution is 585 ℃, the temperature of the zinc pot is 587 ℃, the temperature of the entering plate is 565 ℃, the temperature of the entering plate is 550 ℃ during thin-specification production, the temperature of the entering plate is 560 ℃ during thick-specification production, the temperature of the zinc pot inductor is controlled by high power, the zinc pot inductor is controlled by low power, a narrow-width reciprocating automatic scraper is selected as a scraper of a zinc pot roller system, the operation speed of the scraper is 450mm/min, the pressure of the scraper is 0.3MPa, the optimal operation speed of the scraper is 400mm/min, and the optimal operation pressure of the scraper is 0.5MPa; the air knife uses nitrogen medium; after coating, forced air cooling is adopted within the temperature range of 530 ℃ of the strip steel, the cooling equipment is a movable air box, the distance between the air box and an air knife is 2 meters, the temperature of the strip steel entering the movable air box is 560 ℃, and the rotating speed of an air box fan is 1450rpm.
Step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
EXAMPLE 3,
Step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling; the pickling speed was 70mpm and kept at a constant speed.
Step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling; the rolling reduction rate of the cold continuous rolling is 65%, the residual oil on the single-sided surface of the cold hard plate is 280mg/m, and the single-sided surface of the iron powder is 80 mg/m.
Step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating; the annealing process speed is 70mpm; the temperature of the zinc pot aluminum zinc silicon plating solution is 590 ℃, the temperature of the zinc pot is 587 ℃, the temperature of the entering plate is 600 ℃, the temperature of the entering plate is 560 ℃ during thin-specification production, the temperature of the entering plate is 570 ℃ during thick-specification production, the zinc pot inductor is controlled by high power, the zinc pot inductor is controlled by low power, a narrow reciprocating automatic scraper is selected as a scraper of a zinc pot roller system, the operating speed of the scraper is 600mm/min, the pressure of the scraper is 0.5MPa, the optimal operating speed of the scraper is 450mm/min, and the optimal operating pressure of the scraper is 0.5MPa. The air knife uses nitrogen medium; after coating, forced air cooling is adopted within the range of 540 ℃ of the strip steel temperature, the cooling equipment is a movable bellows, the distance between the bellows and an air knife is 1 meter, the strip steel temperature entering the movable bellows is 570 ℃, and the rotating speed of a bellows fan is 1500rpm.
Step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
Comparative example 1,
Step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling; the pickling speed was 40mpm and kept at a constant speed.
Step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling; the rolling reduction rate of the cold continuous rolling is 50%, the residual oil on the single-sided surface of the cold hard plate is 300mg/m, and the single-sided surface of the iron powder is 100 mg/m.
Step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating; the annealing process speed is 40mpm; the temperature of the zinc pot aluminum zinc silicon plating solution is 580 ℃, the temperature of the zinc pot is 583 ℃, the temperature of the entering plate is 530 ℃, the temperature of the entering plate is 540 ℃ during thin-specification production, the temperature of the entering plate is 550 ℃ during thick-specification production, the zinc pot inductor is controlled by high power, the zinc pot inductor is controlled by low power, a narrow reciprocating automatic scraper is selected as a scraper of a zinc pot roller system, the operating speed of the scraper is 300mm/min, the pressure of the scraper is 0.2MPa, the optimal operating speed of the scraper is 350mm/min, and the optimal operating pressure of the scraper is 0.4MPa; the air knife uses nitrogen medium; after coating, forced air cooling is adopted within the temperature range of 520 ℃ of the strip steel, the cooling equipment is a movable air box, the distance between the air box and an air knife is 3 meters, the temperature of the strip steel entering the movable air box is 550 ℃, and the rotating speed of an air box fan is 1400rpm.
Step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
Comparative example 2,
Step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling; the pickling speed was 65mpm and kept constant.
Step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling; the rolling reduction rate of the cold continuous rolling is 58%, the residual oil on the single-sided surface of the cold hard plate is 290mg/m, and the single-sided surface of the iron powder is 90 mg/m.
Step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating; the annealing process speed is 65mpm; the temperature of the zinc pot aluminum zinc silicon plating solution is 550 ℃, the temperature of the zinc pot is 555 ℃, the temperature of the entering plate is 520 ℃ during thin-specification production, the temperature of the entering plate is 580 ℃ during thick-specification production, the zinc pot inductor is controlled by low power, the zinc pot roller system scraper is a narrow reciprocating automatic scraper, the operating speed of the scraper is 200mm/min, the pressure of the scraper is 0.6MPa, the optimal operating speed of the scraper is 300mm/min, and the optimal operating pressure of the scraper is 0.3MPa; the air knife uses nitrogen medium; after coating, forced air cooling is adopted within the temperature range of 510 ℃ of the strip steel, the cooling equipment is a movable air box, the distance between the air box and an air knife is 2 meters, the temperature of the strip steel entering the movable air box is 540 ℃, and the rotating speed of an air box fan is 1450rpm.
Step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
Comparative example 3,
Step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling; the pickling speed was 70mpm and kept at a constant speed.
Step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling; the rolling reduction rate of the cold continuous rolling is 65%, the residual oil on the single-sided surface of the cold hard plate is 280mg/m, and the single-sided surface of the iron powder is 80 mg/m.
Step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating; the annealing process speed is 70mpm; the temperature of the zinc pot aluminum zinc silicon plating solution is 590 ℃, the temperature of the zinc pot is 587 ℃, the temperature of the entering plate is 600 ℃, the temperature of the entering plate is 560 ℃ during thin-specification production, the temperature of the entering plate is 570 ℃ during thick-specification production, the zinc pot inductor is controlled by high power, the zinc pot inductor is controlled by low power, a narrow reciprocating automatic scraper is selected as a scraper of a zinc pot roller system, the operating speed of the scraper is 600mm/min, the pressure of the scraper is 0.5MPa, the optimal operating speed of the scraper is 450mm/min, and the optimal operating pressure of the scraper is 0.5MPa. The air knife uses nitrogen medium; after coating, forced air cooling is adopted within the range of 540 ℃ of the strip steel temperature, the cooling equipment is a movable air box, the distance between the air box and an air knife is 4 meters, the strip steel temperature entering the movable air box is 570 ℃, and the fan rotating speed of the air box is 1200rpm.
Step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
As can be seen from the comparison of the data in Table 1, the hot dip aluminum zinc plated steel sheet with the thickness of 2.5-3.0mm prepared by the production process, namely the steel sheets prepared in examples 1-3 and comparative examples 1-3, has the advantages that the surface zinc slag and zinc bloom defects of the prepared hot dip aluminum zinc plated steel sheet are greatly reduced by controlling the process speed, the temperature and the forced cooling process parameters, the surface zinc slag content is less than 6%, the zinc bloom grain number of the coating can reach the S level, the surface quality meets the surface quality requirement of the 'FB level' in the 7.10 surface quality of the standard GB/T2518-2019 continuous hot dip zinc plated steel sheet and zinc alloy coated steel sheet and strip, meanwhile, the production process has the advantages of simple technical equipment requirement, low energy consumption and alloy cost, stable product performance, strong industrial easy production operability, stable product performance index, the production process meets the market requirement, and ensures the stable production of good quality finished products.

Claims (7)

1. A production process of a hot dip aluminum zinc silicon steel plate with the thickness of 2.5-3.0mm is characterized by comprising the following steps: the method comprises the following steps:
step one: hot rolling the raw material plate, and pickling to remove iron scales on the surface of the steel coil after hot rolling;
step two: rolling the steel coil subjected to pickling into a chilled coil through cold continuous rolling;
step three: degreasing and cleaning the chilled rolls, performing continuous annealing operation, performing coating operation through a zinc pot and an air knife, and cooling after coating;
step four: and cooling, performing aftertreatment, performing winding operation after the aftertreatment, and winding to obtain a finished product of the hot-dip aluminum-zinc-silicon steel plate.
2. The process for producing a hot dip aluminized zinc silicon steel sheet having a thickness of 2.5 to 3.0mm according to claim 1, wherein: in the first step, the pickling speed is more than or equal to 60mpm and the uniform speed is maintained.
3. The process for producing a hot dip aluminized zinc silicon steel sheet having a thickness of 2.5 to 3.0mm according to claim 1, wherein: in the second step, the cold continuous rolling reduction is 50% -65%, the residual oil on the single-sided surface of the cold hard plate is less than 300mg/m, and the single-sided surface of the iron powder is less than 100 mg/m.
4. The process for producing a hot dip aluminized zinc silicon steel sheet having a thickness of 2.5 to 3.0mm according to claim 1, wherein: in the third step, the annealing process speed is more than or equal to 60mpm.
5. The process for producing a hot dip aluminized zinc silicon steel sheet having a thickness of 2.5 to 3.0mm according to claim 1, wherein: in the third step, the temperature of the zinc pot aluminum zinc silicon plating solution is 580-590 ℃, the temperature of the zinc pot is 585+/-2 ℃, the temperature of the entering plate is 530-600 ℃, the temperature of the entering plate is 540-560 ℃ during thin-specification production, the zinc pot inductor is controlled with high power, the temperature of the entering plate is 550-570 ℃ during thick-specification production, the zinc pot inductor is controlled with low power, a narrow reciprocating automatic scraper is selected as a zinc pot roller system scraper, the operation speed of the scraper is 300-600mm/min, the pressure of the scraper is 0-0.5MPa, the optimal operation speed of the scraper is 350-450mm/min, and the optimal operation pressure of the scraper is 0.4-0.5MPa.
6. The process for producing a hot dip aluminized zinc silicon steel sheet having a thickness of 2.5 to 3.0mm according to claim 1, wherein: in the third step, a nitrogen medium is used for the air knife.
7. The process for producing a hot dip aluminized zinc silicon steel sheet having a thickness of 2.5 to 3.0mm according to claim 1, wherein: in the third step, forced air cooling is adopted within the temperature range of 520-540 ℃ of strip steel after coating, the cooling equipment is a movable air box, the distance between the air box and an air knife is less than 3 meters, the strip steel temperature entering the movable air box is more than 550 ℃, and the fan speed of the air box is more than or equal to 1400rpm.
CN202311384295.2A 2023-10-24 2023-10-24 Production process of hot-dip aluminum-zinc-silicon steel plate with thickness of 2.5-3.0mm Pending CN117448545A (en)

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