Dual-purpose production unit for deep drawing steel and hot-dip galvanized steel, and production method

Abstract

Disclosed are a dual-purpose production unit for deep drawing steel and hot-dip galvanized steel, and a production method. The dual-purpose production unit comprises an inlet section, a process section, and an outlet section; the process section comprises a cleaning section, a continuous annealing section, a zinc pot section, a post-plating cooling section, a finishing and straightening section, and a roller coating post-treatment section which are sequentially arranged in a strip steel production direction; the zinc pot section is provided with a zinc pot and a zinc pot raising / lowering assembly; and the zinc pot raising / lowering assembly drives the zinc pot to ascend and descend, so that strip steel is immersed in or moves away from molten zinc in the zinc pot, allowing selection of whether or not the strip steel is galvanized, and existing apparatuses of other working sections are shared when deep drawing steel or hot-dip galvanized steel is produced, so that both hot-dip galvanized steel and deep drawing steel can be produced, rapid switching of lines can be conducted on the same production unit, and thus a deep drawing steel product or a hot-dip galvanized steel product can be produced. The problem of producing a single product in traditional continuous hot-dip galvanizing units is solved, the requirements of the market for different products can be rapidly responded, and then comprehensive benefits are improved.

Description

A dual-purpose production unit and production method for deep-drawing steel and hot-dip galvanized steel Technical Field

[0001] This invention relates to the field of metal material production technology, and in particular to a dual-purpose production unit and production method for deep-drawing steel and hot-dip galvanized steel. Background Technology

[0002] Cold-rolled plain carbon steel is a type of ordinary carbon structural steel produced by cold rolling. Industries such as engineering machinery, import and export trade, and freight all have a large demand for cold-rolled plain carbon steel.

[0003] Generally, cold-rolled steel coils or deep-drawing steel are produced by continuous carbon steel annealing units, and coated steel coils or hot-dip galvanized steel are produced by continuous hot-dip galvanizing units. If both materials are in demand, two different units need to be invested in to produce the corresponding materials, which results in higher operating costs and a larger footprint.

[0004] Currently, the above two materials can be produced using a hot-dip galvanizing-continuous annealing dual-purpose unit. The process layout involves a bypass design, that is, setting up an over-aging section and a secondary cooling section in parallel in the hot tension roll area. This allows the dual-purpose unit to produce not only hot-dip galvanized steel but also deep-drawing steel. However, a bypass switching is required during the production of deep-drawing steel and hot-dip galvanized steel, making it impossible to quickly switch lines and produce deep-drawing steel products or hot-dip galvanized steel products on the same production unit. Consequently, it is difficult to quickly respond to market demands for different products.

[0005] Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a dual-purpose production unit and method for both deep-drawing steel and hot-dip galvanized steel. This unit can produce both hot-dip galvanized steel and deep-drawing steel, and can quickly cut lines and produce either deep-drawing steel or hot-dip galvanized steel products on the same production unit. This solves the problem of limited product range in traditional continuous hot-dip galvanizing units and facilitates rapid response to market demands for different products, thereby improving overall efficiency.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0008] This invention provides a dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel, comprising an inlet section, a process section, and an outlet section arranged sequentially along the strip steel production direction. The inlet section is used to supply un-hot-dip galvanized strip steel raw materials, and the outlet section is used to coil strip steel products. The process section includes a cleaning section, a continuous annealing section, a zinc pot section, a post-galvanizing cooling section, a finishing and straightening section, and a roll coating post-treatment section arranged sequentially along the strip steel production direction. The zinc pot section is equipped with a zinc pot and a zinc pot lifting assembly. The zinc pot lifting assembly drives the zinc pot to rise and fall, immersing the strip steel in or away from the molten zinc in the zinc pot, allowing selection of whether to galvanize the strip steel. When producing deep-drawing steel or hot-dip galvanized steel, the existing equipment of the cleaning section, the continuous annealing section, the post-galvanizing cooling section, the finishing and straightening section, and the roll coating post-treatment section are shared, thereby producing corresponding hot-dip galvanized steel products or deep-drawing steel products on the same production unit.

[0009] Furthermore, the cleaning section is equipped with an alkaline spray washing tank, an alkaline brush washing tank, an electrolytic ultrasonic cleaning tank, a hot water brush washing tank, a rinsing tank, and a hot air dryer; the continuous annealing section includes a preheating section, a heating section, a homogenizing section, a cooling section, an equalization section, an over-aging section, and a secondary cooling section arranged sequentially; the zinc pot section is also equipped with air knives, which are arranged above the zinc pot and located on the upper and lower sides of the strip steel, respectively, and the airflow sprayed by the air knives scrapes the zinc coating on the surface of the strip steel to control the thickness of the zinc coating on the surface of the strip steel; the post-plating cooling section includes an air cooling section and a water quenching section; the finishing and straightening section is equipped with a finishing machine, a post-finishing cleaning assembly, a post-finishing hot air drying assembly, a straightening machine, and a post-straightening hot air drying assembly; the roll coating post-treatment section is equipped with a roll coating machine and a roll coating post-treatment assembly.

[0010] Furthermore, the continuous annealing section is equipped with a horizontal annealing furnace or a vertical annealing furnace; the strip steel inside the furnace is heated by gas heating, electric heating, radiant tube heating or induction heating, and cooled by spray cooling, air mist cooling or water-cooled roller cooling.

[0011] Furthermore, the cooling medium for the jet cooling and aerosol cooling is nitrogen, hydrogen, inert gas, or a mixture thereof, and also serves as a protective gas; the cooling medium for the water-cooled roller cooling is liquid water or pentane.

[0012] Furthermore, the inlet section is equipped with an uncoiler, a clamping and straightening assembly, an inlet shear, a welding machine, a crescent shear, and an inlet looper; the outlet section is equipped with an outlet looper, an inspection table, an electrostatic oiling assembly, an outlet shear, and a coiler; and an intermediate looper is provided between the post-plating cooling section and the finishing and straightening section.

[0013] Furthermore, guide rollers, tension rollers, and correction rollers are provided between the equipment in the inlet section, the process section, and the outlet section to ensure the connection of the strip steel between the equipment.

[0014] This invention provides a method for the co-line production of deep-drawing steel and hot-dip galvanized steel, using a dual-purpose production line for both deep-drawing and hot-dip galvanized steel to produce either deep-drawing or hot-dip galvanized steel. The method includes the following steps: S1, uncoiling the strip at the entrance section, followed by sequential clamping, straightening, and shearing / welding; S2, conveying the strip obtained in S1 to the process section, cleaning it, and then sequentially entering the preheating section, heating section, soaking section, cooling section, equalization section, over-aging section, and secondary cooling section of a continuous annealing furnace for annealing treatment; S3, immersing the strip obtained in S2 into the molten zinc in a zinc pot for hot-dip galvanizing treatment to obtain a semi-finished hot-dip galvanized steel product, driven by a zinc pot lifting assembly to ensure the strip is immersed in the molten zinc; or, the strip obtained in S2 is directly processed... Above the zinc pot, driven by the zinc pot lifting assembly, the zinc pot is moved away from the strip steel to ensure that the strip steel does not come into contact with the molten zinc in the zinc pot, thus obtaining a deep-drawing steel semi-finished product; S4, the hot-dip galvanized steel semi-finished product or deep-drawing steel semi-finished product obtained in S3 is sequentially subjected to post-galvanizing air cooling and final quenching, followed by finishing, straightening, and roll coating post-treatment; S5, the hot-dip galvanized steel semi-finished product or deep-drawing steel semi-finished product obtained in S4 is sequentially subjected to inspection, electrostatic oiling, and coiling at the exit section to obtain a deep-drawing steel product or hot-dip galvanized steel product; and during the production of deep-drawing steel or hot-dip galvanized steel, the lifting and lowering of the zinc pot is controlled to select whether to galvanize the strip steel, while sharing other existing equipment in the process section, thus producing the corresponding hot-dip galvanized steel product or deep-drawing steel product on the same production unit.

[0015] Furthermore, in S2, the protective gas in the continuous annealing furnace is a nitrogen-hydrogen mixture with an oxygen content ≤50ppm and a dew point temperature ≤-40℃; the nitrogen content in the continuous annealing furnace is 30% to 95%; or the hydrogen content in the continuous annealing furnace is 5% to 70%.

[0016] Furthermore, when producing deep-drawing steel products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the strip outlet temperature of the preheating section is 200 to 280°C; the strip outlet temperature of the heating section is 700 to 920°C; the strip furnace temperature in the soaking section is 750 to 920°C, and the soaking time is at least 30 seconds; the strip outlet temperature of the cooling section is 600 to 700°C; the strip furnace temperature in the over-aging section is 400 to 500°C, and the soaking time is 60 to 120 seconds; the strip outlet temperature of the over-aging section is 300 to 400°C; the strip outlet temperature of the secondary cooling section is 150 to 250°C; and the strip is water-quenched after post-plating air cooling.

[0017] Furthermore, when producing hot-dip galvanized products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the strip outlet temperature of the preheating section is 200 to 280°C; the strip outlet temperature of the heating section is 750 to 900°C; the strip furnace temperature in the soaking section is 750 to 920°C, and the soaking time is at least 30 seconds; the strip outlet temperature of the cooling section is 650 to 700°C; the strip furnace temperature in the over-aging section is 350 to 500°C, and the soaking time is 30 to 60 seconds; the strip temperature entering the zinc pot is 450 to 500°C; after galvanizing, the strip is air-cooled, and when its temperature drops to 150 to 180°C, it is water-quenched.

[0018] The technical solution provided by this invention has the following beneficial effects:

[0019] The zinc pot is raised and lowered by the zinc pot lifting assembly, allowing the strip steel to be immersed in or moved away from the molten zinc in the pot. This allows for selection of whether the zinc pot is put into production, i.e., whether the strip steel is galvanized. When producing deep-drawing steel or hot-dip galvanized steel, the existing equipment of the cleaning section, continuous annealing section, post-galvanizing cooling section, finishing and straightening section, and roll coating post-treatment section is shared. Thus, through a reasonable unit layout and corresponding production methods, not only hot-dip galvanized steel but also deep-drawing steel can be produced. Furthermore, the same production line can be quickly switched to produce either deep-drawing steel or hot-dip galvanized steel products, solving the problem of single-product production in traditional continuous hot-dip galvanizing units. This also facilitates rapid response to market demands for different products, thereby improving overall efficiency. Attached Figure Description

[0020] Figure 1 shows a schematic diagram of the connection of the dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel in the embodiment. Detailed Implementation

[0021] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0023] Referring to Figure 1, this embodiment provides a dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel (hereinafter referred to as the production unit), used for co-line production of deep-drawing steel products or hot-dip galvanized steel products. The production unit includes an inlet section, a process section, and an outlet section arranged sequentially along the strip steel production direction. The inlet section is used to supply un-hot-dip galvanized strip steel raw materials, and the outlet section is used to coil strip steel products. The process section includes a cleaning section 5, a continuous annealing section, a zinc pot section, a post-galvanizing cooling section, a finishing and straightening section, and a roll coating post-treatment section arranged sequentially along the strip steel production direction. The zinc pot section is equipped with a zinc pot 13 and a zinc pot lifting assembly. The zinc pot lifting assembly drives the zinc pot 13 to rise and fall, so that the strip steel is immersed in or away from the zinc liquid in the zinc pot 13, so as to select whether to galvanize the strip steel. When producing deep-drawing steel or hot-dip galvanized steel, the original equipment of the cleaning section 5, continuous annealing section, post-galvanizing cooling section, finishing and straightening section, and roll coating post-treatment section are shared, thereby producing the corresponding hot-dip galvanized steel products or deep-drawing steel products on the same production unit.

[0024] In this embodiment, the inlet section is equipped with an uncoiler 1, a clamping and straightening assembly, an inlet shear 2, a welding machine 3, a crescent shear, and an inlet looper 4. The inlet shear 2, the welding machine 3, and the crescent shear cooperate to achieve shearing and welding of the strip steel.

[0025] The exit section is equipped with an exit looper 22, an inspection table 23, an electrostatic oiling assembly 24, an exit shear 25, and a coiler 26. An intermediate looper 17 is provided between the post-plating cooling section and the finishing and straightening section. Furthermore, guide rollers, tension rollers, and correction rollers are provided between the equipment in the inlet section, process section, and exit section to ensure the connection of the strip steel between the equipment.

[0026] More specifically, the cleaning section 5 is equipped with an alkaline spray washing tank, an alkaline brush washing tank, an electrolytic ultrasonic cleaning tank, a hot water brush washing tank, a rinsing tank, and a hot air dryer. The inlet of the cleaning section 5 is connected to the outlet of the inlet looper 4, and physical and chemical methods are used to clean the surface of the strip steel to remove impurities such as oil and iron powder from the surface of the strip steel.

[0027] The continuous annealing section includes a preheating section 6, a heating section 7, a soaking section 8, a cooling section 9, a balancing section 10, an over-aging section 11, and a secondary cooling section 12 arranged in sequence to achieve heat treatment of the strip steel, thereby improving the microstructure of the strip steel and enhancing its mechanical properties.

[0028] The zinc pot section is also equipped with air knives 14, which are arranged above the zinc pot 13 and located on the upper and lower sides of the strip steel. The airflow from the air knives 14 scrapes the galvanized layer on the surface of the strip steel to control the thickness of the galvanized layer on the surface of the strip steel. Of course, the zinc pot section is also equipped with conventional equipment such as a furnace nose section, a zinc ingot feeding mechanism, a zinc ash extraction mechanism, and a humidification mechanism.

[0029] By setting the zinc pot section in the next stage after the continuous annealing stage, the zinc in the zinc pot 13 is molten, and the temperature of the molten zinc liquid is maintained by the control system of the production unit, thereby ensuring that the strip steel is coated with zinc liquid.

[0030] The post-plating cooling section includes an air cooling section 15 and a water quenching section 16 equipped with a water quenching device. The strip steel is cooled to the temperature required by the process through the air cooling section 15, and the zinc coating solidified at the temperature required by the process is ensured not to stick to the top roller of the post-plating cooling section. Then, it continues to be cooled to the temperature required for water quenching. Of course, the post-plating cooling section can also be equipped with a post-plating tower top zinc removal mechanism.

[0031] The finishing and straightening section is equipped with a finishing machine 18, a post-finishing cleaning assembly, a post-finishing hot air drying assembly, a straightening machine 19, and a straightening hot air drying assembly. At this time, the finishing and straightening section is located in the next section after the post-plating cooling section. After the strip is finished by the finishing machine 18, the mechanical properties of the strip can be improved, the strip shape can be improved, and the surface roughness of the strip can be adjusted. Then, the finished strip enters the straightening machine 19 to continuously stretch and bend the strip to eliminate strip shape defects such as edge waves, middle waves, and wavy lines, thereby improving the straightness of the strip and obtaining strip that meets the requirements for use, ultimately achieving strip shape control.

[0032] The roll coating post-treatment section is equipped with a roll coating machine 20 and a roll coating post-treatment component 21. At this time, the roll coating post-treatment section is set in the next section after the finishing and straightening section. The roll coating machine 20 is used to coat a protective film on the surface of the strip steel after the galvanized layer. Then, it is dried by the roll coating post-treatment component 21, that is, by blowing high-speed hot air onto the surface of the strip steel to dry and passivate the moisture remaining on the surface of the strip steel. Then, it is cooled by the post-treatment cooling of the roll coating post-treatment component 21 to cool the strip steel to 45°C, so as to complete the entire roll coating post-treatment of the strip steel.

[0033] The zinc pot 13 is raised and lowered by the zinc pot lifting assembly, allowing the strip steel to be immersed in or moved away from the molten zinc in the zinc pot 13. This allows for selection of whether the zinc pot 13 is put into production, i.e., whether the strip steel is galvanized. When producing deep-drawing steel or hot-dip galvanized steel, the existing equipment such as the cleaning section 5, continuous annealing section, post-galvanizing cooling section, finishing and straightening section, and roll coating post-treatment section are shared. In this way, through reasonable unit layout and corresponding production methods, not only hot-dip galvanized steel can be produced, but also deep-drawing steel can be produced. Furthermore, the production line can be quickly switched on the same production unit to produce deep-drawing steel products or hot-dip galvanized steel products, which solves the problem of single product production of traditional continuous hot-dip galvanizing units. It is also conducive to quickly responding to market demands for different products, thereby improving overall efficiency.

[0034] Furthermore, the production unit in this embodiment can save initial equipment investment, effectively reduce the total floor space, and meet both the process requirements of cold-rolled steel coil production and the process requirements of coated steel coil production, thereby improving the operating rate and flexibility of the production unit in this embodiment.

[0035] In another preferred embodiment, the continuous annealing section is provided with a horizontal annealing furnace, and the horizontal annealing furnace is provided with a preheating section 6, a heating section 7, a homogenizing section 8, a cooling section 9, an equalization section 10, an over-aging section 11, and a secondary cooling section 12.

[0036] Heating methods such as gas heating, electric heating, radiant tube heating or induction heating are used to heat the strip steel in the furnace, and cooling methods such as jet cooling or air mist cooling are used to cool the strip steel in the furnace.

[0037] Of course, in other embodiments, a vertical annealing furnace can be used instead, or a water-cooled roller cooling method can be used to cool the strip steel inside the furnace, and the cooling medium for water-cooled roller cooling is liquid water or pentane, etc.

[0038] In another preferred embodiment, the cooling medium for jet cooling and aerosol cooling is a nitrogen-hydrogen mixture formed by mixing nitrogen and hydrogen, and it also serves as a protective gas.

[0039] Of course, the cooling medium for air cooling can also be nitrogen, hydrogen, inert gases, or mixtures thereof.

[0040] In addition, in this specific embodiment, the production unit of this embodiment produces deep-drawing steel or hot-dip galvanized steel respectively according to the following co-line production method for deep-drawing steel and hot-dip galvanized steel, specifically including the following steps:

[0041] Step S1: The strip steel in the inlet section is uncoiled by the uncoiler 1, then clamped and straightened by the clamping and straightening assembly, and then sheared and welded by the inlet shear 2, the welding machine 3 and the crescent shear in combination.

[0042] In step S2, the strip steel obtained in step S1 is transported to the process section and first cleaned in cleaning section 5. Then, it enters the preheating section 6, heating section 7, soaking section 8, cooling section 9, equalization section 10, over-aging section 11 and secondary cooling section 12 of the continuous annealing furnace for annealing treatment.

[0043] Step S3: When hot-dip galvanized steel products need to be produced, the strip steel obtained in step S2 is immersed in the zinc liquid in the zinc pot 13 for hot-dip galvanizing treatment to obtain hot-dip galvanized steel semi-finished products. The strip steel is driven by the zinc pot lifting assembly through the zinc pot 13 to ensure that the strip steel is immersed in the zinc liquid in the zinc pot 13.

[0044] When deep-drawing steel products are required, the strip steel obtained in step S2 is passed directly above the zinc pot 13. At this time, the zinc pot 13 is driven by the zinc pot lifting assembly to keep it away from the strip steel, thereby ensuring that the strip steel does not come into contact with the zinc liquid in the zinc pot 13, so as to obtain the deep-drawing steel semi-finished product. That is, in the process section, the steel strip passes through the cleaning section 5, the continuous annealing section where the continuous annealing furnace is located, the zinc pot section, the post-plating cooling section, the finishing and straightening section, and the roll coating post-treatment section in sequence. The steel strip only passes through the zinc pot section, and the galvanizing equipment in the zinc pot section is not put into actual production.

[0045] In step S4, the hot-dip galvanized steel semi-finished product or deep-drawing steel semi-finished product obtained in step S3 is sequentially passed through the air cooling section 15 for post-galvanizing air cooling, and through the water quenching section 16 for final quenching. Then, it is passed through the finishing and straightening section for finishing and straightening, and through the roll coating post-treatment section for roll coating post-treatment.

[0046] In step S5, the hot-dip galvanized steel semi-finished product or deep-drawing steel semi-finished product obtained in step S4 is inspected by the inspection table 23 at the exit section, electrostatically coated by the electrostatic oiling component 24, and wound by the coiler 26 to obtain the deep-drawing steel product or hot-dip galvanized steel product.

[0047] Furthermore, when producing deep-drawing steel or hot-dip galvanized steel, the raising and lowering of the zinc pot 13 is controlled to select whether to galvanize the strip steel. At the same time, other existing equipment in the process section is shared, so that the corresponding hot-dip galvanized steel products or deep-drawing steel products can be produced on the same production unit.

[0048] In step S2 of another preferred embodiment, the oxygen content in the nitrogen-hydrogen mixture in the continuous annealing furnace is ≤50ppm, the dew point temperature is ≤-40℃, and the nitrogen content in the continuous annealing furnace is 30% to 95%, so as to coordinate the heating and cooling in the continuous annealing furnace and at the same time form gas protection for the strip steel.

[0049] Of course, in other embodiments, the hydrogen content in the continuous annealing furnace can also be 5% to 70%.

[0050] In step S3 of another preferred embodiment, when producing deep-drawing steel products, the inlet temperature of the continuous annealing furnace is 20 to 40°C, the strip outlet temperature of the preheating section 6 is 200 to 280°C, the strip outlet temperature of the heating section 7 is 700 to 920°C, the strip furnace temperature of the soaking section 8 is 750 to 920°C, the soaking time of the soaking section 8 is at least 30 seconds, the strip outlet temperature of the cooling section 9 is 600 to 700°C, the strip furnace temperature of the over-aging section 11 is 400 to 500°C, the soaking time of the over-aging section 11 is 60 to 120 seconds, the strip outlet temperature of the over-aging section 11 is 300 to 400°C, the strip outlet temperature of the secondary cooling section 12 is 150 to 250°C, and the strip is water-quenched after being air-cooled after plating. This ensures the heat treatment effect of the deep-drawing steel products.

[0051] When producing hot-dip galvanized products, the inlet temperature of the continuous annealing furnace is 20 to 40°C, the strip outlet temperature of the preheating section 6 is 200 to 280°C, the strip outlet temperature of the heating section 7 is 750 to 900°C, the strip furnace temperature in the soaking section 8 is 750 to 920°C, and the soaking time in the soaking section 8 is at least 30 seconds. The strip outlet temperature of the cooling section 9 is 650 to 700°C, the strip furnace temperature in the over-aging section 11 is 350 to 500°C, and the soaking time in the over-aging section 11 is 30 to 60 seconds. The temperature of the strip entering the zinc pot 13 is 450 to 500°C. After galvanizing, the strip is air-cooled, and when its temperature drops to 150 to 180°C, it is water-quenched. This ensures the heat treatment effect of the hot-dip galvanized products.

[0052] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel, comprising an inlet section, a process section, and an outlet section arranged sequentially along the strip steel production direction, wherein the inlet section is used to supply un-hot-dip galvanized strip steel raw materials, and the outlet section is used to coil strip steel products, characterized in that: The process section includes a cleaning section, a continuous annealing section, a zinc pot section, a post-plating cooling section, a finishing and straightening section, and a roll coating post-treatment section arranged sequentially along the strip steel production direction. The zinc pot section is equipped with a zinc pot and a zinc pot lifting assembly. The zinc pot lifting assembly drives the zinc pot to rise and fall, so that the strip steel is immersed in or away from the zinc liquid in the zinc pot, so as to select whether to galvanize the strip steel. When producing deep-drawing steel or hot-dip galvanized steel, the original equipment of the cleaning section, the continuous annealing section, the post-galvanizing cooling section, the finishing and straightening section, and the roll coating post-treatment section are shared, so as to produce the corresponding hot-dip galvanized steel products or deep-drawing steel products on the same production unit.

2. The dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel according to claim 1, characterized in that: The cleaning section is equipped with an alkaline spray washing tank, an alkaline brush washing tank, an electrolytic ultrasonic cleaning tank, a hot water brush washing tank, a rinsing tank, and a hot air dryer; the continuous annealing section includes a preheating section, a heating section, a homogenizing section, a cooling section, an equalization section, an over-aging section, and a secondary cooling section arranged sequentially; the zinc pot section is also equipped with air knives, which are arranged above the zinc pot and located on the upper and lower sides of the strip steel, respectively, and the airflow sprayed by the air knives scrapes the zinc coating on the surface of the strip steel to control the thickness of the zinc coating on the surface of the strip steel; the post-plating cooling section includes an air cooling section and a water quenching section; the finishing and straightening section is equipped with a finishing machine, a post-finishing cleaning assembly, a post-finishing hot air drying assembly, a straightening machine, and a post-straightening hot air drying assembly; the roll coating post-treatment section is equipped with a roll coating machine and a roll coating post-treatment assembly.

3. The dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel according to claim 2, characterized in that: The continuous annealing section is equipped with a horizontal or vertical annealing furnace; the strip steel inside the furnace is heated by gas heating, electric heating, radiant tube heating or induction heating, and cooled by spray cooling, mist cooling or water-cooled roller cooling.

4. The dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel according to claim 3, characterized in that: The cooling medium for the spray cooling and aerosol cooling is nitrogen, hydrogen, inert gas, or a mixture thereof, and also serves as a protective gas; the cooling medium for the water-cooled roller cooling is liquid water or pentane.

5. The dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel according to any one of claims 1-4, characterized in that: The inlet section is equipped with an uncoiler, a clamping and straightening assembly, an inlet shear, a welding machine, a crescent shear, and an inlet looper; the outlet section is equipped with an outlet looper, an inspection table, an electrostatic oiling assembly, an outlet shear, and a coiler; an intermediate looper is provided between the post-plating cooling section and the finishing and straightening section.

6. The dual-purpose production unit for deep-drawing steel and hot-dip galvanized steel according to any one of claims 1-4, characterized in that: The equipment in the inlet section, the process section, and the outlet section are equipped with steering rollers, tension rollers, and correction rollers to ensure the connection of the strip steel between the equipment.

7. A method for co-line production of deep-drawing steel and hot-dip galvanized steel, wherein a dual-purpose production line for deep-drawing steel and hot-dip galvanized steel as described in any one of claims 1-6 is used to produce either deep-drawing steel or hot-dip galvanized steel, characterized in that, Includes the following steps: S1, the strip steel at the entrance section is uncoiled, and then clamped, straightened and sheared and welded in sequence; S2, after the strip steel obtained from S1 is transported to the process section, it is first cleaned, and then enters the preheating section, heating section, soaking section, cooling section, equalization section, over-aging section and secondary cooling section of the continuous annealing furnace for annealing treatment in sequence. S3, the strip steel obtained in S2 is immersed in the zinc liquid in the zinc pot for hot-dip galvanizing treatment to obtain hot-dip galvanized steel semi-finished product, and is driven by the zinc pot lifting component to ensure that the strip steel is immersed in the zinc liquid in the zinc pot; or the strip steel obtained in S2 is directly passed above the zinc pot, and the zinc pot is driven by the zinc pot lifting component to keep it away from the strip steel, thereby ensuring that the strip steel does not come into contact with the zinc liquid in the zinc pot, to obtain deep-drawing steel semi-finished product; S4 involves sequentially subjecting the hot-dip galvanized steel or deep-drawing steel semi-finished products obtained in S3 to post-galvanizing air cooling and final quenching. Then, finishing, straightening, and roll coating are performed. S5 involves sequentially inspecting, electrostatically coating, and coiling the hot-dip galvanized steel or deep-drawing steel semi-finished products obtained in S4 at the exit section to obtain deep-drawing steel or hot-dip galvanized steel products. During the production of deep-drawing steel or hot-dip galvanized steel, the raising and lowering of the zinc pot is controlled to select whether to galvanize the strip steel. At the same time, other existing equipment in the process section is shared, thereby producing the corresponding hot-dip galvanized steel or deep-drawing steel products on the same production unit.

8. The method for co-line production of deep-drawing steel and hot-dip galvanized steel according to claim 7, characterized in that: In S2, the protective gas in the continuous annealing furnace is a nitrogen-hydrogen mixture with an oxygen content ≤50ppm and a dew point temperature ≤-40℃; the nitrogen content in the continuous annealing furnace is 30% to 95%; or the hydrogen content in the continuous annealing furnace is 5% to 70%.

9. The method for co-line production of deep-drawing steel and hot-dip galvanized steel according to claim 7 or 8, characterized in that: When producing deep-drawing steel products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the strip outlet temperature of the preheating section is 200 to 280°C; the strip outlet temperature of the heating section is 700 to 920°C; the strip furnace temperature in the soaking section is 750 to 920°C, and the soaking time is at least 30 seconds; the strip outlet temperature of the cooling section is 600 to 700°C; the strip furnace temperature in the over-aging section is 400 to 500°C, and the soaking time is 60 to 120 seconds; the strip outlet temperature of the over-aging section is 300 to 400°C; the strip outlet temperature of the secondary cooling section is 150 to 250°C; and the strip is water-quenched after post-plating air cooling.

10. The method for co-line production of deep-drawing steel and hot-dip galvanized steel according to claim 7 or 8, characterized in that: When producing hot-dip galvanized products, the inlet temperature of the continuous annealing furnace is 20 to 40°C; the strip outlet temperature of the preheating section is 200 to 280°C; the strip outlet temperature of the heating section is 750 to 900°C; the strip furnace temperature in the soaking section is 750 to 920°C, and the soaking time is at least 30 seconds; the strip outlet temperature of the cooling section is 650 to 700°C; the strip furnace temperature in the over-aging section is 350 to 500°C, and the soaking time is 30 to 60 seconds; the strip temperature entering the zinc pot is 450 to 500°C; after galvanizing, the strip is air-cooled, and when its temperature drops to 150 to 180°C, it is water-quenched.

Images