6063 aluminum alloy coil and method of making the same

Abstract

This invention discloses a 6063 aluminum alloy coil and its preparation method, relating to the technical field of aluminum alloy coils and their preparation. The aluminum alloy coil preparation process includes melting and casting, homogenization heat treatment, temperature-controlled rolling, low-temperature rolling, solution quenching, and special rolling. During temperature-controlled rolling, the alloy temperature is maintained at 410~460℃, and the final rolling temperature is 300~330℃. The low-temperature rolling temperature is from room temperature to 80℃, with a single-pass processing rate ≤40%. The solution temperature is 540~560℃, the holding time is 1~6 min, the cooling water temperature is ≤40℃, and the cooling rate is ≥50℃ / s. Special rolling is performed using flattening rolls, with a rolling processing rate of 3~7% and a rolling roughness of Ra0.2~0.3μm. This invention can effectively improve the surface quality of the coil, enhance its mechanical properties, and regulate the microstructure of the coil to refine abnormal structures, ultimately obtaining a grain size level of G4.5~G5.5, an abnormal structure size ≤300μm, and a Cube{001} grain size. <100> The roll material has a texture ratio of 25-30%, yield strength of 110-140MPa, tensile strength of 150-180MPa, hardness of 55-65HV, and elongation of ≥15%, and solves the problem of unstable mechanical properties of the roll material when parked.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy coils and their preparation technology, and particularly to a 6063 aluminum alloy coil and its preparation method. Background Technology

[0002] 6063 aluminum alloy, an Al-Mg-Si heat-treatable wrought aluminum alloy, has become the preferred material in many fields such as construction, transportation, and electronics due to its excellent machinability in the T4 temper, superior surface treatment performance in the T6 temper, and high mechanical strength. Its application in electronic products such as smartphones, tablets, and laptops is increasingly widespread, adapting to the trend of thinner and more personalized designs in electronic products, leading to a continuous increase in market demand. The main strengthening phase of this alloy is Mg2Si, and its mechanical properties can be controlled through reasonable heat treatment processes to meet the requirements of different end products. As the core substrate for components such as the shell and frame of electronic products, the surface quality, mechanical properties, and microstructure stability of quenched coils directly determine the quality and service life of the end products.

[0003] Currently, the conventional production process of 6063 aluminum alloy quenched coil mainly includes smelting, homogenization heat treatment, heated rolling, cold rolling, and solution quenching. However, the existing process still has many technical pain points to be solved in practical applications, making it difficult to meet the stringent requirements of electronic products for high performance and high stability of coil. First, in the rolling process, traditional techniques do not precisely control the rolling temperature, often only managing a relatively low final rolling temperature. Furthermore, the cold rolling process is often too hot, leading to uneven microstructure, abnormally coarse microstructure, lattice distortion, and excessive energy storage. Second, the existing solution quenching process parameters are not set appropriately, resulting in insufficient dissolution and uneven precipitation of the strengthening phase Mg2Si after solution quenching, thus affecting the mechanical properties of the coil. While the T4 state of 6063 aluminum alloy is beneficial for downstream secondary processing and stamping into complex shapes, its performance is unstable, making it difficult to consistently obtain products with excellent yield strength, tensile strength, hardness, and elongation, failing to meet the precise mechanical property requirements of electronic products. Moreover, the material's relatively softness and low hardness easily lead to surface quality problems during production, failing to meet the high surface finish requirements of 3C products.

[0004] In summary, the current deformation heat treatment process for 6063 aluminum alloy quenched coils suffers from defects such as poor surface quality, insufficient mechanical properties, uneven microstructure, and unstable mechanical properties during storage. These defects fail to meet the development demands of thinner, more personalized, and higher-precision electronic products. Therefore, developing a deformation heat treatment method for 6063 aluminum alloy quenched coils that can effectively improve the surface quality of the coils, enhance mechanical properties, regulate microstructure, and solve the problem of storage stability has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] To address the above shortcomings, this invention provides a 6063 aluminum alloy coil and its preparation method. By combining temperature-controlled rolling, low-temperature rolling, solution quenching, and special rolling techniques, it solves the problems of poor surface quality, insufficient mechanical properties, uneven microstructure, and unstable mechanical properties during storage found in current 6063 aluminum alloy coils. The specific technical solution is as follows: A method for preparing 6063 aluminum alloy coil includes the following steps: S1. Casting: Aluminum alloy raw materials are batched in a certain proportion, melted and cast to obtain ingots; S2. Homogenization heat treatment: The ingot obtained in step S1 is subjected to homogenization heat treatment, and after being taken out of the furnace, it is naturally cooled to room temperature to obtain the homogenized heat treatment ingot. S3. Temperature-controlled rolling: The ingot obtained in step S2 is cut off at the head and tail and milled, and then temperature-controlled rolling is performed. During the rolling process, the alloy temperature is maintained at 410~460℃, rolled to 30~50mm, and the alloy temperature is finally controlled at 300~330℃, and finally hot rolled to a thickness of 4~6mm. S4. Low-temperature rolling: The hot-rolled coil obtained in step S3 is subjected to low-temperature rolling. The temperature of low-temperature rolling is from room temperature to 80°C, and the single-pass processing rate is ≤40%, to obtain a low-temperature rolled coil with a thickness of 0.6~1.0mm. S5, Solution quenching: The low-temperature rolled coil obtained in S4 is solution quenched to obtain solution quenched coil material; S6. Special rolling: The solution-quenched coil obtained in S5 is subjected to special rolling with a rolling rate of 3-7% to obtain finished aluminum alloy coils.

[0006] Furthermore, the chemical composition of the aluminum alloy coil, by mass percentage, is: Si=0.4~0.6%, Fe≤0.2%, Cu≤0.1%, Mn≤0.01%, Mg=0.6~0.8%, Cr=0.02~0.06%, Zn≤0.05%, Ti=0.02~0.06%, and the magnesium-to-silicon ratio (Mg:Si)=1.2~1.7, with the balance being Al and unavoidable elements, each of which is less than 0.03% and the total amount is less than 0.10%.

[0007] Furthermore, in step S2, the holding temperature for the homogenization heat treatment is 550~570℃, and the holding time is 8~16h.

[0008] Furthermore, in step S5, during the solution quenching, the solution temperature is 540~560℃, the holding time is 1~6min, the cooling water temperature is ≤40℃, and the cooling rate is ≥50℃ / s.

[0009] Furthermore, in step S6, the special rolling roll is a flattening roll with a rolling roughness of Ra0.2~0.3μm.

[0010] The present invention also provides a 6063 aluminum alloy coil prepared by the above preparation method.

[0011] Furthermore, the grain size of the roll material is G4.5~G5.5, the abnormal structure size is ≤300μm, and Cube{001} <100> The texture ratio is 25-30%.

[0012] Furthermore, the yield strength of the roll material is 110~140MPa, the tensile strength is 150~180MPa, the hardness is 55~65HV, and the elongation is ≥15%.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention optimizes processes such as homogenization heat treatment, heated rolling, cold rolling, and solution quenching, and adds a special rolling process after solution quenching. This solves the problems of poor surface quality, insufficient mechanical properties, uneven microstructure, and unstable mechanical properties during storage that exist in current 6063 aluminum alloy coils. It effectively improves the surface quality and mechanical properties of existing 6063 aluminum alloy coils, and regulates the microstructure to refine abnormal structures, ultimately obtaining a grain size level of G4.5~G5.5 and an abnormal structure size ≤300μm. <100> The roll material has a texture ratio of 25-30%, a yield strength of 110-140 MPa, a tensile strength of 150-180 MPa, a hardness of 55-65 HV, and an elongation of ≥15%. The high surface quality roll material obtained by this invention can be processed through complex secondary processing and artificial aging treatment to obtain high-strength end products, which are suitable for the development needs of thinner and lighter, more personalized designs of electronic products such as smartphones, tablets, and laptops.

[0014] 2. This invention controls the homogenization heat treatment temperature to 550~570℃, and then optimizes the traditional hot rolling process into a multi-stage temperature-controlled rolling process. This effectively breaks down different types of second phases and promotes re-dissolution, allowing the alloy solute atoms to dissolve more fully in subsequent quenching. Due to the increased nucleation, the recrystallized grains are finer, and the abnormal grain size is reduced. This results in the finished quenched coil meeting the requirements of a grain size level of G4.5~G5.5 and an abnormal microstructure size ≤300μm. Cube{001} <100> The texture ratio is in the range of 25-30%. Simultaneously, this invention, through a coordinated process of temperature-controlled rolling and solution quenching, reduces the process temperature and time of solution heat treatment, achieving not only energy conservation and emission reduction but also regulating the microstructure of the quenched coil.

[0015] 3. This invention incorporates a special rolling process after the solution quenching step, which significantly improves the overall performance of 6063 aluminum alloy coils. Compared to ordinary quenched coils, its mechanical properties are greatly enhanced, consistently achieving a yield strength of 110~140MPa, tensile strength of 150~180MPa, hardness of 55~65HV, and elongation ≥15%. Furthermore, it ensures that the mechanical properties of the coils do not fluctuate significantly during long-term storage, effectively solving the problem of unstable performance during storage of ordinary quenched coils. Simultaneously, this special rolling process significantly improves the surface quality and shape of the coils, effectively mitigating defects such as pressure marks and regular bulging that are common in ordinary quenched coils due to their lower mechanical properties, further improving the forming qualification rate and reliability of the coils. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the process flow of the present invention; Figure 2 This is a grain and abnormal grain size diagram of the aluminum alloy coil in Example 1; Figure 3 The image shows the EBSD diagram of the texture ratio of the aluminum alloy coil in Example 1, where A is the distribution diagram of different grain orientations and B is the distribution diagram of cubic texture. Figure 4 The changes in material hardness over time are shown for Examples 1 and Comparative Example 2. Detailed Implementation

[0018] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. Unless otherwise defined, all technical terms used below have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of the present invention. Unless otherwise specifically stated, all raw materials, reagents, instruments, and equipment used in the present invention are commercially available or can be prepared by existing methods.

[0019] Example 1 The chemical composition of a 6063 aluminum alloy coil in this embodiment, by mass percentage, is as follows: Si=0.52%, Fe=0.08%, Cu=0.002%, Mn=0.003%, Mg=0.75%, Cr=0.027%, Zn=0.01%, Ti=0.027%, with a magnesium-to-silicon ratio (Mg:Si) of 1.44. The balance is Al and unavoidable elements, with each unavoidable element comprising less than 0.03% and a total amount less than 0.10%. Its preparation method includes the following steps: melting and casting, homogenization heat treatment, head and tail trimming, milling, temperature-controlled rolling, low-temperature rolling, solution quenching, and special rolling. The specific steps are as follows: S1 casting: After the aluminum alloy raw and auxiliary materials are batched according to the above composition ratio, they are melted and cast to obtain ingots; S2 Homogenization heat treatment: The ingot obtained in step S1 is subjected to homogenization heat treatment. The holding temperature of the homogenization heat treatment is 570℃, and the holding time is 12h. After being taken out of the furnace, it is air-cooled to room temperature to obtain the homogenized heat treatment ingot. S3 Temperature-controlled rolling: The ingot obtained in step S2 is cut off at the head and tail and milled, and then temperature-controlled rolling is performed. During the rolling process, the alloy temperature is maintained at 410~460℃ and rolled to 35mm. The alloy temperature at the end of the hot rolling is controlled at 318℃ and finally hot rolled to a thickness of 5mm. S4 Low-temperature rolling: The hot-rolled coil obtained in step S3 is subjected to low-temperature rolling at a temperature of room temperature to 80°C, with a maximum single-pass processing rate of 35%, resulting in a low-temperature rolled coil with a thickness of 0.8 mm. S5 Solution Quenching: The low-temperature rolled coil obtained in S4 is solution quenched at a solution temperature of 550℃, a holding time of 2.2 min, a cooling water temperature of 28℃, and a cooling rate of 60℃ / s to obtain a solution quenched coil. S6 Special Rolling: The solution-quenched coil obtained from S5 is subjected to special rolling with a rolling rate of 5%. Flattening rolls are used for rolling, and the roughness is ground to Ra0.23μm to obtain finished aluminum alloy coils.

[0020] Figure 1 The diagram shows the homogenization heat treatment temperature and time, the alloy temperature during temperature-controlled rolling, the final rolling temperature during temperature-controlled rolling, the low temperature, the solution temperature and time, and the cooling rate, from left to right.

[0021] Figure 2 The image shows the grain size and abnormal grain size of the aluminum alloy coil in Example 1. The average grain size is G5.5, and the abnormal grain size is 262 μm. Figure 3 This is an EBSD diagram showing the texture ratio of the aluminum alloy coil in Example 1, Cube{001} <100> The texture ratio is 27%.

[0022] Example 2 The chemical composition of a 6063 aluminum alloy coil in this embodiment, by mass percentage, is as follows: Si=0.50%, Fe=0.09%, Cu=0.006%, Mn=0.006%, Mg=0.74%, Cr=0.026%, Zn=0.01%, Ti=0.03%, with a magnesium-to-silicon ratio (Mg:Si)=1.48. The balance is Al and unavoidable elements, with each unavoidable element being less than 0.03% and the total being less than 0.10%. Its preparation method includes the following steps: melting and casting, homogenization heat treatment, head and tail trimming, milling, temperature-controlled rolling, low-temperature rolling, solution quenching, and special rolling. The specific steps are as follows: S1 casting: After the aluminum alloy raw and auxiliary materials are batched according to the above composition ratio, they are melted and cast to obtain ingots; S2 Homogenization heat treatment: The ingot obtained in step S1 is subjected to homogenization heat treatment. The holding temperature of the homogenization heat treatment is 570℃, and the holding time is 12h. After being taken out of the furnace, it is air-cooled to room temperature to obtain the homogenized heat treatment ingot. S3 Temperature-controlled rolling: The ingot obtained in step S2 is cut off at the head and tail and milled, and then temperature-controlled rolling is performed. During the rolling process, the alloy temperature is maintained at 410~460℃ and rolled to 40mm. The alloy temperature at the end of the hot rolling is controlled at 314℃ and finally hot rolled to a thickness of 6mm. S4 Low-temperature rolling: The hot-rolled coil obtained in step S3 is subjected to low-temperature rolling at a temperature of room temperature to 80°C, with a maximum single-pass processing rate of 30%, resulting in a low-temperature rolled coil with a thickness of 1.0 mm. S5 Solution Quenching: The low-temperature rolled coil obtained in S4 is solution quenched at a solution temperature of 560℃, a holding time of 2.2 min, a cooling water temperature of 25℃, and a cooling rate of 55℃ / s to obtain a solution quenched coil. S6 Special Rolling: The solution-quenched coil obtained from S5 is subjected to special rolling with a rolling rate of 5%. Flattening rolls are used for rolling, and the roughness is ground to Ra0.25μm to obtain finished aluminum alloy coils.

[0023] Example 3 The chemical composition of a 6063 aluminum alloy coil in this embodiment, by mass percentage, is as follows: Si=0.52%, Fe=0.08%, Cu=0.002%, Mn=0.003%, Mg=0.75%, Cr=0.027%, Zn=0.01%, Ti=0.027%, with a magnesium-to-silicon ratio (Mg:Si) of 1.44. The balance is Al and unavoidable elements, with each unavoidable element comprising less than 0.03% and a total amount less than 0.10%. Its preparation method includes the following steps: melting and casting, homogenization heat treatment, head and tail trimming, milling, temperature-controlled rolling, low-temperature rolling, solution quenching, and special rolling. The specific steps are as follows: S1 casting: After the aluminum alloy raw and auxiliary materials are batched according to the above composition ratio, they are melted and cast to obtain ingots; S2 Homogenization heat treatment: The ingot obtained in step S1 is subjected to homogenization heat treatment. The holding temperature of the homogenization heat treatment is 540℃, and the holding time is 12h. After being taken out of the furnace, it is air-cooled to room temperature to obtain the homogenized heat treatment ingot. S3 Temperature-controlled rolling: The ingot obtained in step S2 is cut off at the head and tail and milled, and then temperature-controlled rolling is performed. During the rolling process, the alloy temperature is maintained at 410~460℃ and rolled to 35mm. The alloy temperature for the final hot rolling is controlled at 320℃ and finally hot rolled to a thickness of 4mm. S4 Low-temperature rolling: The hot-rolled coil obtained in step S3 is subjected to low-temperature rolling at a temperature of room temperature to 80°C, with a maximum single-pass processing rate of 28%, resulting in a low-temperature rolled coil with a thickness of 0.6 mm. S5 Solution Quenching: The low-temperature rolled coil obtained in S4 is solution quenched at a solution temperature of 560℃, a holding time of 1.5 min, a cooling water temperature of 32℃, and a cooling rate of 65℃ / s to obtain a solution quenched coil. S6 Special Rolling: The solution-quenched coil obtained from S5 is subjected to special rolling with a rolling rate of 5%. Flattening rolls are used for rolling, and the roughness is ground to Ra0.25μm to obtain finished aluminum alloy coils.

[0024] Comparative Example 1 The difference between this comparative example and Example 1 is that the solution temperature is 570℃, the holding time is 7 minutes, the cooling water temperature is ≤40℃, and the cooling rate is 30℃ / s. The remaining processes are the same as in Example 1.

[0025] Comparative Example 2 The difference between this comparative example and Example 1 is that no special rolling process is performed; the coil after solution quenching is the final aluminum alloy coil, and the remaining processes are the same as in Example 1.

[0026] Comparative Example 3 The difference between this comparative example and Example 1 is that the special rolling process uses a rolling rate of 10%, the rolling roll is a flattening roll, and the roughness is ground to Ra0.25μm to obtain the finished aluminum alloy coil. The remaining processes are the same as in Example 1.

[0027] Comparative Example 4 The difference between this comparative example and Example 1 lies in the chemical composition. The aluminum alloy coil of this comparative example has the following mass percentage composition: Si=0.36%, Fe=0.08%, Cu=0.002%, Mn=0.003%, Mg=0.68%, Cr=0.027%, Zn=0.01%, Ti=0.001%, and a magnesium-to-silicon ratio (Mg:Si)=1.89. The balance is Al and unavoidable elements, with each unavoidable element being less than 0.03% and the total being less than 0.10%. The remaining preparation steps are the same as in Example 1.

[0028] Comparative Example 5 The difference between this comparative example and Example 1 is that: during the rolling process in step S3, the alloy temperature is maintained at 350~420℃, and the final hot-rolled alloy temperature is controlled at 290℃; the temperature of the low-temperature rolling in step S4 is room temperature~100℃, and the maximum single-pass processing rate is 50%. Other steps and raw materials are the same as in Example 1.

[0029] Performance testing: The mechanical properties (yield strength, tensile strength, elongation, hardness) and microstructure (grain size, anomalous structure size, Cube{001}) of the aluminum alloy coils prepared in Examples 1-3 and Comparative Examples 1-5 were tested respectively. <100> The results of the analysis of texture ratio and surface quality are shown in Table 1.

[0030] Mechanical properties were tested according to the methods in GB / T 228.1-2021 and GB / T 4340.1-2024 standards; grain level was tested according to the average grain calculation method in GB / T3246.1-2024; abnormal microstructure size was determined according to the test standard in GB / T6394-2017; and the surface quality of the material was inspected according to internal control requirements.

[0031] Table 1. Microstructure and property results of the quenched aluminum alloy coils from the examples and comparative examples. The data in Examples 1 to 3 above show that the present invention, through optimizing processes such as homogenization heat treatment, heated rolling, cold rolling, and solution quenching, and adding special rolling after solution quenching, effectively improves the surface quality and mechanical properties of existing 6063 aluminum alloy coils, and regulates the microstructure of the coils to refine abnormal structures, ultimately obtaining a grain size level of G4.5~G5.5 and an abnormal structure size ≤300μm. <100> A roll material with a texture ratio of 25-30%, a yield strength of 120-140MPa, a tensile strength of 160-180MPa, a hardness of 55-67HV, and an elongation of ≥15%.

[0032] The table above shows a comparison of data from Example 1 and Comparative Example 1: The present invention achieves lower solution treatment temperature and shorter treatment time, while ensuring appropriate solution treatment effect, reducing production energy consumption and shortening production cycle. Furthermore, due to the higher cooling rate, the resulting grain size is higher, the abnormal structure size is smaller, and the mechanical properties of the final product are also better.

[0033] The table above shows a comparison of data from Example 1 and Comparative Example 2: Without the special rolling process, the tensile strength, yield strength, and hardness of the final product are far lower than those of the coil material prepared by this invention. The surface quality defect rate is significantly increased, and periodic bulging and interlayer scratches are also prone to occur. This indicates that the special rolling process added in this invention can significantly improve the overall performance and surface quality of the coil material, meeting usage requirements. Furthermore, the added special rolling process ensures that the mechanical properties of the coil material do not fluctuate significantly during long-term storage. Figure 4 The figure shows the change in material hardness of Example 1 and Comparative Example 2 over time. As shown in the figure, the hardness of the coil in Comparative Example 2 fluctuated greatly during the 28-day storage period, while that in Example 1 showed no significant fluctuation. This indicates that the present invention can ensure that the mechanical properties of the coil do not fluctuate significantly during long-term storage, effectively solving the problem of unstable storage performance of ordinary quenched coils.

[0034] The table above shows a comparison of data from Example 1 and Comparative Example 3: When a special rolling process uses an excessively high rolling rate, although the yield strength and hardness of the coil are improved, the elongation will be greatly reduced, which will not meet the usage requirements. At the same time, the proportion of Cube texture will decrease. This indicates that the rolling rate of 3-7% selected in this invention can balance the various properties of the coil and ensure that the overall performance of the product meets the standards.

[0035] The table above shows a comparison of data from Example 1 and Comparative Example 4: When the silicon content decreases and the magnesium-silicon ratio deviates from the range of 1.4 to 1.6 of the present invention, the grain size of the final product decreases and the size of abnormal structures increases significantly. This indicates that the chemical composition ratio and magnesium-silicon ratio range controlled by the present invention can effectively regulate the microstructure of aluminum alloys, ensure that the coil material obtains qualified grain size and small abnormal structures, and thus ensure that the overall performance of the finished product meets the standards.

[0036] The table above shows a comparison of data from Example 1 and Comparative Example 5: When the overall temperature of the alloy is too low during temperature-controlled rolling, the final rolling temperature is insufficient, and the maximum single-pass processing rate of low-temperature rolling is too high, the grain size of the final product is lower, the size of abnormal structures is significantly increased, the proportion of cube texture is greatly reduced, and all mechanical properties are significantly lower than those of the coil prepared by this invention. The surface quality defect rate also increases. This indicates that the temperature range of temperature-controlled rolling, the final rolling temperature, and the range of maximum single-pass processing rate of low-temperature rolling controlled by this invention can effectively regulate the microstructure and texture proportion of aluminum alloys, ensuring that the finished product obtains excellent comprehensive performance and good surface quality.

[0037] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for preparing 6063 aluminum alloy coil, characterized in that, Includes the following steps: S1. Casting: Aluminum alloy raw materials are batched in a certain proportion, melted and cast to obtain ingots; S2. Homogenization heat treatment: The ingot obtained in step S1 is subjected to homogenization heat treatment, and after being taken out of the furnace, it is naturally cooled to room temperature to obtain the homogenized heat treatment ingot. S3. Temperature-controlled rolling: The ingot obtained in step S2 is cut off at the head and tail and milled, and then temperature-controlled rolling is performed. During the rolling process, the alloy temperature is maintained at 410~460℃, rolled to 30~50mm, and the alloy temperature is finally controlled at 300~330℃, and finally hot rolled to a thickness of 4~6mm. S4. Low-temperature rolling: The hot-rolled coil obtained in step S3 is subjected to low-temperature rolling. The temperature of low-temperature rolling is from room temperature to 80°C, and the single-pass processing rate is ≤40%, to obtain a low-temperature rolled coil with a thickness of 0.6~1.0mm. S5, Solution quenching: The low-temperature rolled coil obtained in S4 is solution quenched to obtain solution quenched coil material; S6. Special rolling: The solution-quenched coil obtained in S5 is subjected to special rolling with a rolling rate of 3-7% to obtain finished aluminum alloy coils.

2. The method for preparing 6063 aluminum alloy coil according to claim 1, characterized in that, The chemical composition of the aluminum alloy coil, by mass percentage, is as follows: Si = 0.4~0.6%, Fe ≤ 0.2%, Cu ≤ 0.1%, Mn ≤ 0.01%, Mg = 0.6~0.8%, Cr = 0.02~0.06%, Zn ≤ 0.05%, Ti = 0.02~0.06%, and Mg:Si = 1.2~1.7, with the balance being Al and unavoidable elements, each of which is less than 0.03% and the total amount is less than 0.10%.

3. The method for preparing 6063 aluminum alloy coil according to claim 1, characterized in that, In step S2, the holding temperature for the homogenization heat treatment is 550~570℃, and the holding time is 8~16h.

4. The method for preparing 6063 aluminum alloy coil according to claim 1, characterized in that, In step S5, during the solution quenching, the solution temperature is 540~560℃, the holding time is 1~6min, the cooling water temperature is ≤40℃, and the cooling rate is ≥50℃ / s.

5. The method for preparing 6063 aluminum alloy coil according to claim 1, characterized in that, In step S6, the special rolling roll is a flattening roll with a rolling roughness of Ra0.2~0.3μm.

6. A 6063 aluminum alloy coil prepared by the preparation method according to any one of claims 1 to 5.

7. The 6063 aluminum alloy coil according to claim 6, characterized in that, The grain size of the roll material is G4.5~G5.5, and the abnormal structure size is ≤300μm. Cube{001} <100> The texture ratio is 25-30%.

8. The 6063 aluminum alloy coil according to claim 6, characterized in that, The yield strength of the roll material is 110~140MPa, the tensile strength is 150~180MPa, the hardness is 55~65HV, and the elongation is ≥15%.

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