A low-carbon, short-process, high-throughput method for producing expandable, deep-drawing aluminum coils for cookware.

Abstract

This invention belongs to the field of aluminum alloy production technology. Specifically, it discloses a method for low-carbon, short-process, high-throughput production of expandable deep-drawing cookware aluminum coils. The raw materials are electrolytic aluminum molten metal and recycled aluminum waste. The production process is carried out by continuous casting and rolling. Compared with the current conventional hot rolling production method, it can significantly optimize the production process. It eliminates the need for ingot cutting and milling and multiple hot rough rolling processes. The cold rolling process only requires two rolling passes to complete the production, shortening the work-in-process time, effectively reducing production costs, and resulting in superior finished product performance, especially high and stable elongation, small difference in transverse and longitudinal elongation, and good material isotropy. It can meet the grain size requirements of the billet without the use of aluminum ingots. End customers will not experience cracking during deep drawing and expansion. It achieves green, environmentally friendly, and low-carbon goals while ensuring stable finished product quality and enabling high-throughput production. The billet can be produced at a high efficiency of more than 27 tons per hour, enabling efficient order delivery.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aluminum alloy production and specifically discloses a method for producing deep-drawing cookware aluminum coil capable of being expanded in a low-carbon short-process and large-flux. BACKGROUND

[0002] The inner pot of the electric rice cooker can be divided into straight cylinder-shaped inner pot, spherical / arc-shaped inner pot and conical / trapezoidal inner pot according to shapes. The spherical / arc-shaped inner pot belongs to an expanded inner pot, which needs to bear severe and complex deformation during forming. The material must meet three core requirements of high strength, high plasticity and uniform structure without defects, and one of them is indispensable. Therefore, the expanded inner pot has high requirements on the material performance. At present, the aluminum alloy sheet used for processing the expanded inner pot is generally produced by hot rolling. For example, the patent CN111041283B uses hot rolling to produce 3003 aluminum alloy round sheet capable of being deep-drawn and expanded for the inner pot of the electric rice cooker. The aluminum alloy ingot produced by melting and casting needs to be subjected to homogenization treatment, hot rolling, cold rolling, annealing, sheet punching and other processes to obtain the finished aluminum alloy round sheet. The production process is long, the production flow is long, and the production cost is high. SUMMARY

[0003] In order to solve the problems in the background art, the application discloses a method for producing deep-drawing cookware aluminum coil capable of being expanded in a low-carbon short-process and large-flux. The method is produced by continuous casting and rolling, which greatly optimizes the production process, reduces the production cost, shortens the production time and has excellent performance of the finished product, and realizes low-carbon, high-efficiency, short-process and high-quality production.

[0004] In order to achieve the above-mentioned application purposes, the application adopts the following technical solutions:

[0005] The method for producing deep-drawing cookware aluminum coil capable of being expanded in a low-carbon short-process and large-flux comprises the following steps:

[0006] S1, melting: 50% to 60% of recycled aluminum scrap and 40% to 50% of electrolytic aluminum liquid are put into a melting furnace to prepare an aluminum melt. The temperature of the melting furnace is 745 to 755 DEG C. Stirring is performed. The original sample is analyzed. According to the analysis result of the original sample, iron agent, manganese agent, copper agent, titanium agent, aluminum-titanium alloy, fast-acting silicon and the like are added. The alloy composition is adjusted to be qualified. The mass percentage of each component is as follows: Si: 0.1% to 0.2%, Fe: 0.3% to 0.5%, Cu: 0.05 to 0.1%, Mn: 0.6 to 0.8%, Mg≤0.01%, Zn≤0.01%, Ti: 0.02% to 0.04%, and the total amount of impurity elements is ≤0.03%, and the balance is aluminum. After the composition is qualified, refining and slag removal are performed. After the slag removal, the furnace is started after being placed for 30 to 40 minutes. The temperature of the aluminum liquid is controlled at 740 to 750 DEG C during the starting of the furnace. After the starting of the furnace, the aluminum melt flows into a guide flow tank stably. Four groups of aluminum-titanium-boron wires are uniformly added into the aluminum melt. The aluminum melt sequentially flows into a degassing tank and a plate filter tank for online degassing and filtering, and then flows into a front tank.

[0007] S2, continuous casting and rolling: the aluminum melt in the forehearth is injected into the casting cavity at a constant speed by the casting nozzle, the aluminum melt in the casting cavity is discharged out of the plate with the rotation of the steel belt, the continuously cast slab enters the three-stand tandem rolling mill after the looper table, the thickness at the inlet of the first stand of the three-stand tandem rolling mill is 19 mm, the thickness at the outlet of the first stand of the three-stand tandem rolling mill is 13-14 mm, the thickness at the outlet of the second stand of the three-stand tandem rolling mill is 9-10 mm, the thickness at the outlet of the third stand of the three-stand tandem rolling mill is 6.5-7.5 mm, and the plate at the outlet of the third stand of the three-stand tandem rolling mill is wound into an aluminum coil;

[0008] S3, homogenization annealing: the aluminum coil obtained in S2 is subjected to homogenization annealing, in which the blank is first placed in an annealing furnace, the furnace temperature is uniformly raised to 580℃ for 4h, and then the furnace temperature is maintained for 20-25h, and then the furnace temperature is lowered to 170℃ to discharge the furnace, and the cold-rolled coil after annealing is cooled to below 60℃ and then transferred to the subsequent process for production;

[0009] S4, cold rolling: the aluminum coil after homogenization annealing is directly fed into the cold rolling mill for rolling, and the processing rate of each cold rolling pass is controlled to be 45-55%, and after 2 passes of rolling, an aluminum coil with a thickness of 1.4-2.1 mm is obtained;

[0010] S5, finished product annealing: the aluminum coil obtained in step S4 is placed in an annealing furnace for finished product annealing, the temperature is uniformly raised to 220℃ for 2 hours, and then the temperature is maintained for 4 hours under negative pressure, and then the temperature is uniformly raised to 420℃ for 2 hours, and then the temperature is maintained for 20-25 hours under positive pressure to discharge the furnace, and then the temperature is lowered to 170℃ to discharge the furnace, and then naturally cooled to room temperature;

[0011] S6, detection and packaging: the tensile strength of the aluminum coil product is 85MPa-100MPa, the elongation is ≥45%, the difference between the longitudinal and transverse elongation is within 2%, and the qualified product is packaged according to the packaging requirements of the round sheet aluminum coil.

[0012] Further, in the method for producing the expandable deep-drawing cookware aluminum coil with low carbon and large flux in a short process, in step S1, titanium agent and aluminum-titanium alloy are simultaneously added to the aluminum melt.

[0013] Further, in the method for producing the expandable deep-drawing cookware aluminum coil with low carbon and large flux in a short process, in step S1, after the melt is refined, skimming and static, samples are taken from both sides of the furnace door for composition detection, and the deviation of each alloy content is below 0.01%.

[0014] Further, in the method for producing the expandable deep-drawing cookware aluminum coil with low carbon and large flux in a short process, in step S1, argon refining is performed using a refiner during refining, the refining time is 20-30min, and the aluminum melt is refined by argon gas, and the boiling height of the aluminum melt is ≤100mm.

[0015] Furthermore, in the method for low-carbon, short-process, high-throughput production of expandable deep-drawing cookware aluminum coils, in step S2, the front box temperature is 685–705℃, the casting speed is 6.8–7.8 m / min, and the thickness of the cast slab is 19 mm.

[0016] Furthermore, in the method for low-carbon, short-process, high-throughput production of expandable deep-drawing cookware aluminum coils, in step S3, the billet aluminum coil needs to be placed on a high-level rack during homogenization annealing to ensure suspended annealing.

[0017] Furthermore, in the method for low-carbon, short-process, high-throughput production of expandable deep-drawing cookware aluminum coils, in step S4, the thickness tolerance of the cold-rolled finished product does not exceed ±1.5%.

[0018] Furthermore, in the method for low-carbon, short-process, high-throughput production of expandable deep-drawing cookware aluminum coils, in step S5, the temperature difference between different zones in the furnace during finished product annealing is within ±3℃.

[0019] Due to the adoption of the technical solution described above, the present invention has the following advantages:

[0020] 1. The method for low-carbon, short-process, high-throughput production of expandable deep-drawing cookware aluminum coils disclosed in this invention adopts continuous casting and rolling, which can significantly optimize the production process compared with the current conventional hot rolling production method. It eliminates the need for ingot cutting and milling and multiple hot rough rolling processes. The cold rolling process only requires two rolling passes to complete the production, shortening the work-in-process time, effectively reducing production costs, and producing finished products with superior performance, especially high and stable elongation, small difference in transverse and longitudinal elongation, and good material isotropy. It prevents cracking during deep drawing and expansion for end customers, ensuring stable quality for end customers. The aluminum coils for expandable deep-drawing cookware produced using this method have good edge quality and no edge cracking problems. Therefore, the finished product does not need to be trimmed, reducing waste generation, increasing yield, and reducing production costs.

[0021] 2. The method for low-carbon, short-process, high-throughput production of expandable deep-drawing cookware aluminum coils disclosed in this invention uses electrolytic aluminum molten aluminum and recycled aluminum waste as raw materials. It does not require the use of aluminum ingots and can meet the standard of billet grain size. While achieving green, environmentally friendly, and low-carbon goals, it ensures stable finished product quality and enables high-throughput production. The billet can be produced at a high efficiency of more than 27 tons per hour, enabling high-efficiency order delivery. Detailed Implementation

[0022] The present invention will be further explained and illustrated below with reference to embodiments. However, this should not be construed as limiting the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. Example 1

[0023] The specific steps of the low-carbon, short-process, high-throughput production method for expandable, deep-drawing aluminum coils for cookware are as follows:

[0024] S1. Smelting: 41.8% recycled aluminum waste and 58.2% electrolytic aluminum liquid are placed in a smelting furnace for remelting to prepare aluminum melt. The smelting furnace temperature is 753℃. An initial sample is taken for analysis. Based on the initial sample analysis results, iron, manganese, copper, titanium, aluminum-titanium alloy, and quick-dissolving silicon are added simultaneously. Titanium and aluminum-titanium alloy are added to the aluminum melt to adjust the alloy composition to meet the requirements. The mass percentages of each component are: Si: 0.11%, Fe: 0.35%, Cu: 0.055%, Mn: 0.67%, Mg: 0.007%, Zn: 0.006%, Ti: 0.024%, with total impurities ≤ 0.03%, and the balance being aluminum. After adjustment and approval, refining and slag removal are carried out. During refining, an Hd2000 refining machine is used for argon refining, which takes 23 minutes. When argon is introduced into the aluminum melt for refining, the tumbling height of the aluminum melt is ≤100mm. After refining, slag is removed, and the liquid surface must be mirror-like. After standing for 33 minutes, the furnace is started. After refining, slag removal and standing, samples are taken from both sides of the furnace door to test the composition. The content deviation of each alloy is less than 0.01%. The temperature of the aluminum melt is controlled at 742℃ when the furnace is started. After the furnace is started, the aluminum melt flows smoothly into the guide channel. Four sets of aluminum-titanium-boron wires are added to the aluminum melt at a uniform speed. The aluminum melt enters the degassing box and plate filter box in sequence for online degassing and filtration before flowing into the front box.

[0025] S2. Continuous Casting and Rolling: During continuous casting, molten aluminum in the front box is injected into the casting cavity at a uniform speed through the casting nozzle. The molten aluminum in the casting cavity exits the plate as the steel strip rotates. The inner sides of the two steel strips are connected to the circulating cooling water. The cooling water temperature is controlled at 34℃ and the cooling water pressure is controlled at 0.46MPa. The heat in the molten aluminum is carried away by the cooling water through the steel strip. During continuous casting, the front box temperature is maintained at 692℃, the casting speed is controlled at 7.0m / min, and the thickness of the cast slab is controlled at 19mm. The continuously cast slab enters the three-stand rolling mill for rolling through the looper table. During the slab rolling, emulsion is used for lubrication and cooling. The thickness at the first stand of the three-stand rolling mill is 19mm, the thickness at the first stand of the three-stand rolling mill is 13mm, the thickness at the second stand of the three-stand rolling mill is 9mm, and the thickness at the third stand of the three-stand rolling mill is 6.5mm. The strip exiting the third stand of the three-stand rolling mill is coiled into aluminum coils by a coiler.

[0026] S3. Homogenization Annealing: The aluminum coils rolled up in step S2 are subjected to homogenization annealing. During annealing, the 6.5mm thick billet is first placed in the high-level rack in the annealing furnace to ensure suspended annealing. Then, the furnace temperature is raised to 580℃ for 4 hours and held for 22 hours. Then, the furnace temperature is lowered to 170℃ and the coils are taken out of the furnace. The annealed cold-rolled coils are air-cooled to 55℃ and transferred to subsequent production processes.

[0027] S4. Cold rolling: After homogenization annealing, the 6.5mm thick aluminum coil is directly rolled on the cold rolling mill. The processing rate of each cold rolling pass is controlled at about 53%. The coil is rolled into a 1.4mm thick aluminum coil in 2 passes. The thickness tolerance of the cold-rolled product does not exceed ±1.5%.

[0028] S5. Finished product annealing: Place the 1.4mm aluminum coil into the annealing furnace for finished product annealing. During finished product annealing, the temperature difference between different zones in the furnace is within ±3℃. After 2 hours of uniform heating to 220℃, hold under negative pressure for 4 hours, then after 2 hours of uniform heating to 420℃, hold under positive pressure for 23 hours, and then remove from the furnace when the furnace temperature drops to 170℃ and allow to cool naturally to room temperature.

[0029] S6. Inspection and Packaging: Check that the thickness of the aluminum coil does not exceed the tolerance range, and that there are no folds or dents on the end face. The longitudinal tensile strength of the finished aluminum coil is 92MPa, the transverse tensile strength is 93MPa, the longitudinal elongation is ≥47%, and the transverse elongation is ≥46%. If it is qualified, it shall be packaged in accordance with the packaging requirements for aluminum coils for round sheets. Example 2

[0030] The specific steps of the low-carbon, short-process, high-throughput production method for expandable, deep-drawing aluminum coils for cookware are as follows:

[0031] S1. Smelting: 58.2% recycled aluminum scrap and 41.8% molten electrolytic aluminum are remelted in a smelting furnace at 745℃ to prepare molten aluminum. An initial sample is taken for analysis. Based on the analysis results, iron, manganese, copper, titanium, aluminum-titanium alloy, and quick-dissolving silicon are added in one step to adjust the alloy composition to meet the requirements. The mass percentages of each component are: Si: 0.19%, Fe: 0.42%, Cu: 0.09%, Mn: 0.78%, Mg: 0.004%, Zn: 0.006%, Ti: 0.034%, with total impurities ≤ 0.03%, and the balance being aluminum. After the composition is adjusted to meet the requirements, further refining is carried out. During the refining and slag removal processes, an Hd2000 refining machine is used for argon refining for 29 minutes. When argon is introduced into the aluminum melt for refining, the tumbling height of the aluminum melt is ≤100mm. After refining, slag is removed, and the liquid surface must be mirror-like. The melt is allowed to stand for 38 minutes before being taken out of the furnace. After refining, slag removal, and standing, samples are taken from both sides of the furnace door to test the composition. The content deviation of each alloy is less than 0.01%. The temperature of the aluminum melt is controlled at 750℃ when the furnace is taken out. After the furnace is taken out, the aluminum melt flows smoothly into the guide channel. Four sets of aluminum-titanium-boron wires are added to the aluminum melt at a uniform speed. The aluminum melt enters the degassing box and plate filter box in sequence for online degassing and filtration before flowing into the front box.

[0032] S2. Continuous Casting and Rolling: During continuous casting, molten aluminum in the forebox is injected into the casting cavity at a uniform speed through the casting nozzle. The molten aluminum in the casting cavity exits the plate as the steel strip rotates. The inner sides of the two steel strips are connected to the circulating cooling water. The cooling water temperature is controlled at 37℃ and the cooling water pressure is controlled at 0.58MPa. The heat in the molten aluminum is carried away by the cooling water through the steel strip. During continuous casting, the forebox temperature is maintained at 699℃, the casting speed is controlled at 7.7m / min, and the thickness of the cast slab is controlled at 19mm. The continuously cast slab enters the three-stand rolling mill through the looper table. During the slab rolling, emulsion is used for lubrication and cooling. The thickness at the entrance of the first stand of the three-stand rolling mill is 19mm, the thickness at the exit of the first stand of the three-stand rolling mill is 14mm, the thickness at the exit of the second stand of the three-stand rolling mill is 10mm, and the thickness at the exit of the third stand of the three-stand rolling mill is 7.5mm. The strip exiting the third stand of the three-stand rolling mill is coiled into aluminum coils by a coiler.

[0033] S3. Homogenization Annealing: The aluminum coils rolled into coils need to undergo homogenization annealing first. During annealing, the 7.5mm thick billet is first placed in the high-level material rack in the annealing furnace to ensure suspended annealing. Then, the furnace temperature is raised to 580℃ for 4 hours and held for 25 hours. Then, the furnace temperature is lowered to 170℃ and the coils are taken out of the furnace. The annealed cold-rolled coils need to be air-cooled to 52℃ and transferred to subsequent production processes.

[0034] S4. Cold rolling: After homogenization annealing, the 7.5mm thick aluminum coil is directly rolled on the cold rolling mill. The processing rate of each cold rolling pass is controlled at 47%. After two passes, it is rolled into an aluminum coil with a thickness of 2.1mm. The thickness tolerance of the cold-rolled product does not exceed ±1.5%.

[0035] S5. Finished product annealing: Place the 2.1mm aluminum coil into the annealing furnace for finished product annealing. During finished product annealing, the temperature difference between different zones in the furnace is within ±3℃. After 2 hours, the temperature is raised to 220℃ and held under negative pressure for 4 hours. Then, after another 2 hours, the temperature is raised to 420℃ and held under positive pressure for 25 hours. Finally, when the furnace temperature is lowered to 170℃, the coil is removed from the furnace and allowed to cool naturally to room temperature.

[0036] S6. Inspection and Packaging: Check that the thickness of the aluminum coil does not exceed the tolerance range, and that there are no folds or damage on the end face. The finished aluminum coil is tested to ensure that the longitudinal tensile strength reaches 96MPa, the transverse tensile strength reaches 95MPa, the longitudinal elongation is ≥51%, and the transverse elongation is ≥52%. It is then deemed qualified and packaged in accordance with the packaging requirements for aluminum coils for round sheets.

[0037] The parts of this invention not described in detail are prior art.

[0038] The embodiments selected herein for the purpose of disclosing the inventive objectives are currently considered suitable; however, it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and invention.

Claims

1. A method for the low-carbon short-flow high-throughput production of deep-drawn cookware aluminum coils that can be expanded, characterized in that, It comprises the following steps: S1, smelting: 50% to 60% of recycled aluminum scrap, 40% to 50% of electrolytic aluminum liquid are put into a smelting furnace to prepare an aluminum melt, the temperature of the smelting furnace is 745 to 755 ℃, stirring, taking the original sample for testing, according to the original sample test results, adding iron agent, manganese agent, copper agent, titanium agent, aluminum titanium alloy, fast-acting silicon, etc., adjusting the alloy composition to be qualified, wherein the mass percentage of each component is: Si: 0.1% to 0.2%, Fe: 0.3% to 0.5%, Cu: 0.05 to 0.1%, Mn: 0.6 to 0.8%, Mg≤0.01%, Zn≤0.01%, Ti: 0.02% to 0.04%, the total of impurity elements≤0.03%, and the balance is aluminum; after the composition is qualified, refining and slagging are carried out, after slagging, the furnace is kept still for 30 to 40 min, the furnace is lifted, the temperature of the aluminum liquid is controlled at 740 to 750 ℃ when the furnace is lifted, after the furnace is lifted, the aluminum melt flows into the guide flow tank stably, four groups of aluminum titanium boron wires are uniformly added into the aluminum melt, and the aluminum melt sequentially flows into the degassing tank and the plate filter tank for online degassing and filtering, and then flows into the front tank; S2, continuous casting and rolling: the aluminum melt in the front tank is uniformly injected into the casting cavity by the casting nozzle when continuous casting, the aluminum melt in the casting cavity is out of the plate with the rotation of the steel belt, the continuously cast slab passes through the loop table and enters the three-stand rolling mill for rolling, the thickness at the inlet of the first stand of the three-stand rolling mill is 19 mm, the thickness at the outlet of the first stand of the three-stand rolling mill is 13 to 14 mm, the thickness at the outlet of the second stand of the three-stand rolling mill is 9 to 10 mm, the thickness at the outlet of the third stand of the three-stand rolling mill is 6.5 to 7.5 mm, and the plate at the outlet of the third stand of the three-stand rolling mill is rolled into an aluminum roll; S3, homogenization annealing: the aluminum roll obtained in S2 is subjected to homogenization annealing, during annealing, the blank is first put into an annealing furnace, the furnace temperature is uniformly raised to 580 ℃ for 4 h, and then the furnace temperature is kept for 20 to 25 h, then the furnace temperature is lowered to 170 ℃, and the furnace is discharged, after annealing, the cold rolling roll is air cooled to below 60 ℃, and then transferred to the subsequent process for production; S4, cold rolling: the aluminum roll after homogenization annealing is directly rolled on a cold rolling mill group, the processing rate of each cold rolling pass is controlled at 45% to 55%, and after 2 passes of rolling, an aluminum roll with a thickness of 1.4 to 2.1 mm is obtained; S5, finished product annealing: the aluminum roll obtained in step S4 is put into an annealing furnace for finished product annealing, the temperature is uniformly raised to 220 ℃ for 2 h, the temperature is kept for 4 h under negative pressure, then the temperature is uniformly raised to 420 ℃ for 2 h, the temperature is kept for 20 to 25 h under positive pressure, the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ℃, and the furnace is discharged, and then the temperature is lowered to 170 ​ 2. A method of producing deep-drawn expandable cookware aluminum coil in a low-carbon short flow large flux process according to claim 1, characterized in that, ​ 3. The method of producing expandable deep drawn cookware aluminum coil in low carbon short flow and high throughput as claimed in claim 1 wherein, ​ 4. The method of producing expandable deep drawn cookware aluminum coil in low carbon short flow and high throughput as claimed in claim 1 wherein, ​ 5. The method of producing expandable deep drawn cookware aluminum coil in low carbon short flow high throughput as claimed in claim 1 wherein, In step S2, the temperature of the forehearth is 685-705°C, the casting speed is 6.8-7.8 m / min, and the thickness of the cast slab is 19 mm.

6. The method of producing expandable deep drawn cookware aluminum coil stock of claim 1 wherein, In step S3, the aluminum roll of the blank is placed on a high rack during homogenization annealing to ensure that the blank is annealed in the air.

7. The method of producing expandable deep drawn cookware aluminum coil stock of claim 1 wherein, In step S4, the thickness tolerance of the cold-rolled product is not more than ±1.5%.

8. The method of producing expandable deep drawn cookware aluminum coil stock of claim 1 wherein, In step S5, the temperature difference between the zones in the furnace during product annealing is within ±3°C.