Multi-working-mode hot galvanizing group furnace nose unit and internal atmosphere control method thereof

Abstract

The application discloses a hot galvanizing group furnace nose unit of multiple working modes and an internal atmosphere control method thereof, which comprises: a baffle structure arranged between the upper end of a furnace nose and a hot tension roller chamber to prevent zinc ash from entering the hot tension roller chamber; an air inlet structure arranged at the upper end of the furnace nose to introduce protective gas into the furnace nose body; an electric heating structure arranged on the outer side of the furnace nose body to prevent zinc ash from condensing and caking in the furnace nose body; an air outlet structure arranged at the lower end of the furnace nose to extract the zinc ash in the furnace nose body; a furnace nose internal dew point control device arranged at the lower end of the furnace nose; and a furnace nose internal monitoring device used for monitoring the granularity and flow of the zinc ash in the furnace nose body in real time. The application provides greater adaptability for producing different products and different surface quality requirements on the same production line by adopting different treatment methods for the internal atmosphere of the furnace nose.

Description

Technical Field

[0001] This invention relates to a thin strip steel coating generation technology, and more specifically, to a hot-dip galvanizing furnace nose unit with multiple operating modes and its internal atmosphere control method. Background Technology

[0002] Combination Figure 1 and Figure 2 As shown, in the continuous hot-dip galvanizing process of strip steel, strip steel 1 enters the hot tension roll chamber 2 from the annealing furnace, then is turned by the hot tension roll 3 and enters the furnace nose body. The furnace nose body includes the upper end 4 and the lower end 5 of the furnace nose. Strip steel 1 descends through the furnace nose body and enters the zinc pot 6. The zinc pot 6 is a widely recognized proprietary term in the industry, referring to a "pot-shaped" structure that holds liquid metal. It not only refers to liquid zinc, but also includes liquid zinc alloys, aluminum-iron alloys, zinc-aluminum-magnesium alloys, etc. The zinc pot 6 contains liquid metal 7 at high temperature. After the strip steel 1 descends into the zinc pot 6, it is turned by the submerged roll 8 and then ascends, leaving the zinc pot area. In actual continuous hot-dip galvanizing production lines for strip steel, the furnace nose body is mostly designed in sections. The upper end 4 and the lower end 5 of the furnace nose are connected by a flange 9, and the upper end 4 of the furnace nose and the hot tension roll chamber 2 are connected by a flange 10. The purpose of this design is to facilitate maintenance. In addition, in order to prevent the strip 1 from being scratched due to excessive sag when running in the furnace nose body, some furnace nose bodies are designed with internal furnace nose support rollers 11.

[0003] The furnace nose body is a closed space, with its lower end 5 inserted into the molten metal 7 by approximately 200-500 mm. This isolates the internal atmosphere of the furnace nose body from the external atmospheric environment. The internal gas and the gas in the hot tension roller chamber 2 are interconnected, both being nitrogen-hydrogen protective gases. The molten metal 7 in the lower part of the furnace nose body evaporates at high temperatures due to the nitrogen-hydrogen protective gas atmosphere, forming metal vapor 13. Metal vapor 13 diffuses freely within the furnace nose body. The metal vapor 13 condenses, forming micro-particle metal, which also reacts with a small amount of oxygen in the furnace nose body to form corresponding metal oxide micro-particles. The mixture of these two is called furnace nose metal ash.

[0004] The metal ash produced by the evaporation of liquid metal 7 diffuses inside the furnace nose body. When its content reaches a certain amount, it will be deposited on the inner wall of the furnace nose body. In addition, the protective atmosphere of the return flow will also carry the metal ash into the hot tension roller chamber 2 and even the furnace area.

[0005] Both the metallic ash deposited on the inner wall of the furnace nose and the metallic ash entering the hot tension roll chamber 2 and the furnace area negatively impact the hot-dip galvanizing process and product quality of the strip steel 1. The analysis is as follows: The metallic ash adsorbed inside the furnace nose body accumulates gradually. Metallic ash has a loose structure, and when it accumulates to a certain extent on the inner wall, it will fall off. This fallen metallic ash either falls directly onto the strip steel or onto the molten metal surface at the bottom of the furnace nose. These two locations are common sources of "exposed iron" and "metallic ash" defects in the coating of this type of unit. Furthermore, the metallic ash that flows back into the hot tension roll chamber and even the furnace with the protective gas, while not directly affecting product quality, can still cause production difficulties and increased costs due to the large amount of metallic ash adsorbed on the roll surface or heat exchanger surface in this area. The actual production line requires periodic shutdowns to clean the metallic ash deposits in the hot tension roll chamber and annealing furnace, which is due to this reason.

[0006] Looking at the development history of continuous hot-dip galvanizing production lines, metal ash control was initially not given much attention, mainly because early users had low requirements for coating quality. If users of the coated products had no objections, naturally, it wouldn't be a concern. When end-users of the coated products had specific requirements regarding the quality defects of metal ash on the strip steel surface, manufacturers of hot-dip galvanized strip steel developed metal ash control technology, specifically zinc ash "suppression" technology. Currently, a common practice is to increase the dew point of the protective gas inside the furnace nose, see... Figure 1 A high-dew-point nitrogen-hydrogen protective gas 9, i.e., a humidified nitrogen-hydrogen protective gas, is introduced above the molten metal surface in the furnace nose. The difference between this protective gas and the protective gas in the hot tension roller chamber 2 and the furnace nose body is that the water content is increased, while other components remain unchanged. The mechanism for increasing the water content in the protective atmosphere is that water reacts with the liquid metal on the surface at high temperature, forming a thin film of metal oxide. The presence of this film prevents the continuous evaporation of the liquid metal, thereby controlling the amount of metal ash generated.

[0007] The above measures, from the perspective of actual production practice, present difficulties, as analyzed below: The precise amount of water introduced into the furnace nose is difficult to control. A low dew point, meaning less moisture, results in poor inhibition of metal evaporation. Conversely, raising the dew point, meaning more moisture, increases the amount of metal oxides formed on the liquid metal surface. Furthermore, if the protective gas contains excess water, defects such as "inability to plate" will occur. Based on the above analysis, the generation of metal ash inside the furnace nose and the resulting product defects are major challenges in hot-dip galvanizing production. Industry professionals have undertaken targeted improvement efforts to address this issue.

[0008] The industry also employs a technology for extracting and filtering zinc ash atmosphere from the furnace nose, known as the "filtration" mode. However, this technology has drawbacks in practice. Firstly, the existing "filtration" mode lacks monitoring of the zinc ash, which is prone to condensation and blockage, requiring shutdown for repairs. This is particularly problematic for production lines producing multiple products on a single unit, where both the aforementioned "suppression" mode and the "filtration" purification mode present difficulties. This is because both "suppression" and "filtration" modes have their own applicable scenarios and are complementary.

[0009] Existing patent applications, such as US Patent 6315829B1, propose a method for external circulation of the furnace nose atmosphere. This method involves arranging a separate external circulation device to extract, filter, and return the internal atmosphere. While this approach has some merit, it is simplistic, and the equipment described in this technology is prone to atmosphere blockage in practice. Chinese Patent CN202380066U proposes a method that adds an additional nitrogen humidification system to improve control over the humidifying gas. However, based on the preceding analysis and description, this method may have some effect, but it cannot solve the negative impact of zinc ash on product quality. Specifically, increasing the water content in the protective gas leads to increased zinc oxide formation on the zinc bath surface and the "uncoated" defect, which remains unresolved. For example, Chinese patent CN203270013U is similar to the aforementioned US patent, proposing an independent zinc vapor circulation absorption device. Its main innovation lies in the arrangement of a set of control devices, which can regulate the temperature and pressure of the atmosphere. However, this approach has rarely been reported in actual production. The reason is that the protective atmosphere filtration device is arranged independently, resulting in large heat loss, difficulty in maintaining the temperature, accumulation of zinc ash in the pipeline, and no practically usable production parameters are provided. Summary of the Invention

[0010] In view of the above-mentioned defects in the existing technology, the purpose of this invention is to provide a hot-dip galvanizing furnace nose unit with multiple working modes and its internal atmosphere control method. By using different control methods for the atmosphere inside the furnace nose, it provides greater adaptability for the production of different products with different surface quality requirements on the same production line.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] On the one hand, a multi-mode hot-dip galvanizing furnace nose unit includes:

[0013] A baffle structure is located between the upper end of the furnace nose and the hot tension roller chamber to prevent zinc ash from entering the hot tension roller chamber.

[0014] An air intake structure is located at the upper end of the furnace nose to introduce protective gas into the furnace nose body.

[0015] An electric heating structure is provided on the outer side of the furnace nose body to prevent the zinc ash from condensing and agglomerating inside the furnace nose body.

[0016] An exhaust structure is located at the lower end of the furnace nose to extract the zinc ash from the furnace nose body.

[0017] A dew point control device inside the furnace nose is located at the lower end of the furnace nose to humidify the protective gas inside the furnace nose body.

[0018] An internal monitoring device for the furnace nose is used to monitor the particle size and flow rate of the zinc ash inside the furnace nose body in real time.

[0019] An internal molten metal level pump forced circulation loop device is installed inside the furnace nose body to circulate molten metal;

[0020] An internal zinc liquid level protective gas purging device is installed inside the furnace nose body to purge the liquid level of the molten metal.

[0021] Preferably, the baffle structure includes a first baffle disposed above the strip and a second baffle disposed below the hot tension roll;

[0022] The first baffle is configured to have an adjustable opening, while the second baffle is configured to have a fixed opening.

[0023] Preferably, the air intake structure includes an air intake pipe connected to the upper end of the furnace nose;

[0024] The air intake pipe is equipped with a pipe electric heater.

[0025] Preferably, the gas outlet structure includes a gas outlet pipe connected to the lower end of the furnace nose;

[0026] The gas outlet pipe is also equipped with an electric heater, a sedimentation device, and a filter screen in sequence.

[0027] Preferably, the electric heating structure is a resistance wire disposed on the outer surface of the furnace nose body.

[0028] On the other hand, a method for controlling the internal atmosphere of a hot-dip galvanizing furnace nose unit based on the aforementioned multi-operating mode includes:

[0029] Suppression mode eliminates or reduces the generation of metal ash by suppressing the evaporation of liquid metal, thereby controlling the surface quality of the product;

[0030] In the purification mode, the metal ash produced by the evaporation of the molten metal is extracted to the outside of the furnace nose body for purification, so as to achieve controlled surface quality of the product.

[0031] The transition mode is the transition from the inhibition mode to the purification mode, so as to achieve controlled surface quality of the product.

[0032] Preferably, the suppression mode includes the hot-dip galvanizing furnace nose opening the furnace nose body, the internal molten metal level pump forced circulation loop device, the furnace nose internal dew point control device, the electric heating structure, and the furnace nose internal monitoring device;

[0033] Close the adjustable opening structure, the air intake structure, and the air outlet structure.

[0034] Preferably, the purification mode includes the hot-dip galvanizing furnace nose opening the furnace nose body, the internal molten metal level pump forced circulation loop device, the adjustable opening structure, the air inlet structure, the air outlet structure, the electric heating structure, and the furnace nose internal monitoring device.

[0035] Turn off the dew point control device inside the furnace nose and the protective gas purging device for the inner zinc liquid level.

[0036] Preferably, the transition mode includes the hot-dip galvanizing furnace nose opening the furnace nose body, the internal molten metal level pump forced circulation loop device, the furnace nose internal dew point control device, the adjustable opening structure, the air intake structure, the electric heating structure, and the furnace nose internal monitoring device.

[0037] Close the air outlet structure.

[0038] Preferably, the products include hot-dip pure zinc products, hot-dip galvanized iron alloy products, hot-dip aluminum-zinc alloy products, and hot-dip aluminum-zinc-magnesium alloy products.

[0039] The hot-dip pure zinc product uses a liquid metal containing the following components by mass percentage: Al: 0.14-0.30%, balance Zn, with a temperature range of 450-470℃.

[0040] The hot-dip galvanized iron alloy product uses a liquid metal that comprises the following components by mass percentage: Al: 0.10-0.14%, balance Zn, with a temperature range of 450-470℃.

[0041] The hot-dip aluminum-zinc alloy product uses a liquid metal containing the following components by mass percentage: Al: 50-55%, Si: 1.0-1.5%, balance Zn, with a temperature range of 590-600℃.

[0042] The hot-dip aluminum-zinc-magnesium alloy product uses a liquid metal containing the following components by mass percentage: Al: 50-55%, Si: 1.0-1.5%, Mg: 1.0-2.0%, with the balance being Zn, and a temperature range of 590-600℃.

[0043] The present invention provides a multi-mode hot-dip galvanizing furnace nose unit and its internal atmosphere control method, which eliminates the negative impact of the presence of metal ash inside the furnace nose of the hot-dip galvanizing unit on the surface quality of hot-dip galvanized products and the normal operation of the production line, thus improving the quality of hot-dip galvanized products and the stable operation of the hot-dip galvanizing unit. In particular, for units with multiple products, different working modes are adopted to achieve zinc ash treatment inside the furnace nose. Attached Figure Description

[0044] Figure 1 This is a structural schematic diagram of the existing furnace nose body assembly;

[0045] Figure 2 yes Figure 1 A schematic diagram of direction A in the middle;

[0046] Figure 3 This is a schematic diagram of the structure of the furnace nose of the hot-dip galvanizing unit of the present invention;

[0047] Figure 4 yes Figure 3 A schematic diagram of the B-direction;

[0048] Figure 5 yes Figure 3 Schematic diagram of the central air intake structure;

[0049] Figure 6 yes Figure 3 A schematic diagram of the central air outlet structure. Detailed Implementation

[0050] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] Combination Figures 3 to 6 As shown, the hot-dip galvanizing furnace nose unit with multiple working modes provided by the present invention includes:

[0052] A baffle structure is located between the upper end 21 of the furnace nose and the hot tension roll chamber 22 to prevent zinc ash from entering the hot tension roll chamber 22. This structure includes a first baffle 20 located above the strip 100 and a second baffle 37 located below the hot tension roll 36. The first baffle 20 has an adjustable opening Δ2, which can be adjusted for strips of different thicknesses. The second baffle 37 is a fixed structure, with an opening Δ1 sufficient for the hot tension roll 36 to operate.

[0053] The air intake structure 23 is located at the upper end 21 of the furnace nose, and introduces a protective gas, such as nitrogen, into the furnace nose body. Figure 5As shown, the air intake structure 23 includes an air intake pipe 29 connected to the upper end 21 of the furnace nose, and an electric heater 30 (heating temperature greater than 420℃) is installed on the air intake pipe 29. Pressure monitoring instruments are also arranged on the air intake pipe 29, with pressure regulation achieved through a pressure reducing valve, and temperature monitoring instruments are also installed, with temperature regulation achieved through the electric heater 30. By regulating pressure and temperature, the air intake pipe 29 achieves a balance between pressure (slight positive pressure) and energy inside the furnace nose body (preventing a drop in the furnace inner wall temperature). Simultaneously, this air intake structure 23 also has a supplementary function of purging zinc ash from the inner wall of the furnace nose body.

[0054] The electric heating structure 24 is located on the outer side of the furnace nose body to prevent zinc ash from condensing and agglomerating inside the furnace nose body; the electric heating structure 24 uses a thermal resistance wire to maintain a high temperature of the furnace nose body.

[0055] The exhaust structure 25, located at the lower end 26 of the furnace nose, is used to extract the zinc ash atmosphere generated by the metal vapor 27 within the furnace nose body; combined with Figure 6 As shown, the gas outlet structure 25 includes a gas outlet pipe 31 connected to the lower end 26 of the furnace nose. An electric heater, a deposition device 32, and a filter screen 33 are also sequentially installed on the gas outlet pipe 31. The deposition device 32 is used to deposit large particles of zinc ash (coarse filtration), and the filter screen 33 is used to filter small particles of zinc ash (fine filtration).

[0056] The dew point control device 28 inside the furnace nose is located at the lower end 26 of the furnace nose. It is used to humidify the protective gas inside the furnace nose body and can reduce zinc ash through surface oxidation.

[0057] The internal monitoring device of the furnace nose is used to monitor the particle size and flow rate of zinc ash in the furnace nose body in real time, and maintain the zinc ash concentration within a stable range.

[0058] An internal molten metal level pump forced circulation loop device is located inside the furnace nose body to circulate molten metal 35.

[0059] An internal zinc liquid level protective gas purging device is located inside the furnace nose body and is used to purge the liquid level of the molten metal 35.

[0060] This invention also provides an internal atmosphere control method for a hot-dip galvanizing furnace nose unit based on the multi-working mode of this invention. The hot-dip galvanizing furnace nose needs to meet the requirements of producing products with various process windows and characteristics. Since the characteristics of the molten metal 35 in the zinc pot 34 are also different, generally speaking, there are two main types: one is called a 460+ zinc pot, containing pure zinc, zinc-iron alloy, low-aluminum zinc-aluminum-magnesium, etc., with a typical temperature of 460±10℃; the other is called a 600+ zinc pot, containing aluminum-zinc alloy, high-aluminum zinc-aluminum-magnesium, etc., with a typical temperature of 595±5℃. In actual production, the above two types of zinc pots require different zinc ash control modes, which mainly include:

[0061] The suppression mode eliminates or reduces the generation of metal ash by suppressing the evaporation of liquid metal 35, thereby achieving controlled surface quality of the product.

[0062] In the purification mode, the metal ash produced by the evaporation of molten metal 35 is extracted to the outside of the furnace nose body for purification, so as to achieve controlled surface quality of the product.

[0063] Transition mode is the transition from suppression mode to purification mode to achieve stability and integrity of the production process and control of product surface quality.

[0064] The on / off status of each component of the hot-dip galvanizing furnace nose in the three operating modes is as follows:

[0065] The suppression mode includes the hot-dip galvanizing furnace nose opening furnace nose body, internal metal liquid level pump forced circulation loop device, internal zinc liquid level protective gas purging device, furnace nose internal dew point control device 28, electric heating structure 24 and furnace nose internal monitoring device.

[0066] The structure 20 has an adjustable closing angle, the intake structure 23 has an exhaust structure 25.

[0067] The purification mode includes the hot-dip galvanizing furnace nose opening furnace nose body, internal metal liquid level pump forced circulation loop device, adjustable opening structure 20, air inlet structure 23, air outlet structure 25, electric heating structure 24 and furnace nose internal monitoring device.

[0068] 28. Close the dew point control device inside the furnace nose and the zinc liquid level protection gas purging device inside the furnace nose body.

[0069] The transition mode includes the hot-dip galvanizing furnace nose opening furnace nose body, internal metal liquid level pump forced circulation loop device, internal zinc liquid level protective gas purging device, furnace nose internal dew point control device 28, opening adjustable structure 20, air intake structure 23, furnace nose body internal gas purging device, electric heating structure 24 and furnace nose internal monitoring device.

[0070] Close the air outlet structure 25.

[0071] The products include hot-dip pure zinc products, hot-dip galvanized iron alloy products, hot-dip aluminum-zinc alloy products, and hot-dip aluminum-zinc-magnesium alloy products.

[0072] The liquid metal used in hot-dip pure zinc products comprises the following components by mass percentage: Al: 0.14~0.30%, balance Zn, with a temperature range of 450~470℃;

[0073] The liquid metal used in hot-dip galvanized iron alloy products comprises the following components by mass percentage: Al: 0.10-0.14%, balance Zn, with a temperature range of 450-470℃;

[0074] The liquid metal used in hot-dip aluminum-zinc alloy products comprises the following components by mass percentage: Al: 50-55%, Si: 1.0-1.5%, balance Zn, with a temperature range of 590-600℃.

[0075] The liquid metal used in hot-dip aluminum-zinc-magnesium alloy products comprises the following components by mass percentage: Al: 50-55%, Si: 1.0-1.5%, Mg: 1.0-2.0%, with the balance being Zn, and the temperature range is 590-600℃.

[0076] During the production of the above four products, the generated metallic ash can be effectively controlled; depending on the different quality requirements of the products, the two working modes of metallic ash suppression evaporation and external filtration can be switched to provide flexibility in furnace nose atmosphere control.

[0077] In summary, the multi-mode hot-dip galvanizing furnace nose unit and its internal atmosphere control method of the present invention are improvements and enhancements based on existing patents. They have multiple functions and selectable modes, can meet the needs of co-production of different products, and can effectively eliminate the negative impact of metal ash on product quality.

[0078] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A multi-mode hot-dip galvanizing furnace nose unit, characterized in that, include: A baffle structure is located between the upper end of the furnace nose and the hot tension roller chamber to prevent zinc ash from entering the hot tension roller chamber. An air intake structure is located at the upper end of the furnace nose to introduce protective gas into the furnace nose body. An electric heating structure is provided on the outer side of the furnace nose body to prevent the zinc ash from condensing and agglomerating inside the furnace nose body. An exhaust structure is located at the lower end of the furnace nose to extract the zinc ash from the furnace nose body. A dew point control device inside the furnace nose is located at the lower end of the furnace nose to humidify the protective gas inside the furnace nose body. An internal monitoring device for the furnace nose is used to monitor the particle size and flow rate of the zinc ash inside the furnace nose body in real time. An internal molten metal level pump forced circulation loop device is installed inside the furnace nose body to circulate molten metal; An internal zinc liquid level protective gas purging device is installed inside the furnace nose body to purge the liquid level of the molten metal.

2. The multi-mode hot-dip galvanizing furnace nose unit according to claim 1, characterized in that: The baffle structure includes a first baffle disposed above the strip and a second baffle disposed below the hot tension roll. The first baffle is configured to have an adjustable opening, while the second baffle is configured to have a fixed opening.

3. The multi-mode hot-dip galvanizing furnace nose unit according to claim 2, characterized in that: The air intake structure includes an air intake pipe connected to the upper end of the furnace nose; The air intake pipe is equipped with a pipe electric heater.

4. The multi-mode hot-dip galvanizing furnace nose unit according to claim 2, characterized in that: The gas outlet structure includes a gas outlet pipe connected to the lower end of the furnace nose; An electric heater, a sedimentation device, and a filter screen are also sequentially installed on the gas outlet pipe.

5. The multi-mode hot-dip galvanizing furnace nose unit according to claim 2, characterized in that: The electric heating structure is a resistance wire located on the outer surface of the furnace nose body.

6. A method for controlling the internal atmosphere of a hot-dip galvanizing furnace nose unit with multiple operating modes as described in any one of claims 2-5, characterized in that, include: Suppression mode eliminates or reduces the generation of metal ash by suppressing the evaporation of liquid metal, thereby controlling the surface quality of the product; In the purification mode, the metal ash produced by the evaporation of the molten metal is extracted to the outside of the furnace nose body for purification, so as to achieve controlled surface quality of the product. The transition mode is the transition from the inhibition mode to the purification mode, so as to achieve controlled surface quality of the product.

7. The internal atmosphere control method according to claim 6, characterized in that: The suppression mode includes the hot-dip galvanizing furnace nose opening the furnace nose body, the internal molten metal level pump forced circulation loop device, the furnace nose internal dew point control device, the electric heating structure, and the furnace nose internal monitoring device; Close the adjustable opening structure, the air intake structure, and the air outlet structure.

8. The internal atmosphere control method according to claim 6, characterized in that: The purification mode includes the hot-dip galvanizing furnace nose opening the furnace nose body, the internal metal liquid level pump forced circulation loop device, the adjustable opening structure, the air inlet structure, the air outlet structure, the electric heating structure, and the furnace nose internal monitoring device. Turn off the dew point control device inside the furnace nose and the protective gas purging device for the inner zinc liquid level.

9. The internal atmosphere control method according to claim 6, characterized in that: The transition mode includes the hot-dip galvanizing furnace nose opening the furnace nose body, the internal molten metal level pump forced circulation loop device, the furnace nose internal dew point control device, the adjustable opening structure, the air intake structure, the electric heating structure, and the furnace nose internal monitoring device. Close the air outlet structure.

10. The internal atmosphere control method according to claim 6, characterized in that: The products include hot-dip pure zinc products, hot-dip galvanized iron alloy products, hot-dip aluminum-zinc alloy products, and hot-dip aluminum-zinc-magnesium alloy products. The hot-dip pure zinc product uses a liquid metal containing the following components by mass percentage: Al: 0.14-0.30%, balance Zn, with a temperature range of 450-470℃. The hot-dip galvanized iron alloy product uses a liquid metal that comprises the following components by mass percentage: Al: 0.10-0.14%, balance Zn, with a temperature range of 450-470℃. The hot-dip aluminum-zinc alloy product uses a liquid metal containing the following components by mass percentage: Al: 50-55%, Si: 1.0-1.5%, balance Zn, with a temperature range of 590-600℃. The hot-dip aluminum-zinc-magnesium alloy product uses a liquid metal containing the following components by mass percentage: Al: 50-55%, Si: 1.0-1.5%, Mg: 1.0-2.0%, with the balance being Zn, and a temperature range of 590-600℃.

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