Hot rolling method of 3104 aluminum alloy hot rolling slab

Abstract

The application provides a hot rolling method of a 3104 aluminum alloy hot rolling slab, which comprises the following steps: S10, homogenizing heat treatment is performed on a 3104 aluminum alloy ingot; S20, the 3104 aluminum alloy ingot after homogenization is directly discharged for hot rough rolling to obtain a hot rough rolling slab; and S30, the hot rough rolling slab is subjected to continuous rolling type hot finish rolling to obtain a hot finish rolling slab; wherein in the step S20, the hot rough rolling is performed for m passes in total, wherein in the first m-n passes, the reduction rate of each pass is D1, in the last n passes, the reduction rate of each pass is D2, and D1 is greater than D2, and the surface oxide scale of the hot rough rolling slab is destroyed and removed by adjusting the reduction rate of each pass of the rough rolling. In the application, the problem of surface quality defects caused by serious surface oxidation of the material due to high-temperature rough rolling is avoided. The 3104 aluminum alloy ingot can be high-temperature rough rolled, so that the production cycle of heat treatment is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hot rolling technology of aluminum alloys, and in particular to a hot rolling method for 3104 aluminum alloy hot-rolled slabs. Background Technology

[0002] 3104 aluminum alloy is the main material used to manufacture thinned and stretched two-piece cans (commonly known as easy-open cans). The main processing steps include casting, homogenization heat treatment, hot rough rolling, continuous hot finish rolling, and cold rolling. Among these, the homogenization heat treatment temperature is generally above 550℃, with 580-600℃ being the most common. If high-temperature rolling (above 550℃) is performed, it will lead to severe oxidation of the material surface, resulting in surface quality problems.

[0003] In existing technologies, the initial rolling temperature for hot roughing is generally around 500℃. Therefore, after homogenization heat treatment, the ingot needs to be cooled to 500℃ for a period of time before hot rolling can begin. Cooling to 500℃ before starting hot rolling avoids severe surface oxidation caused by high-temperature initial rolling (above 550℃), which can lead to surface quality problems.

[0004] However, this heat treatment method tends to result in a long heat treatment production cycle, which affects the production efficiency of aluminum alloy rolled plates and also increases the production cost of aluminum alloy rolled plates.

[0005] In other words, the existing hot rolling method for 3104 aluminum alloy hot-rolled slabs has the problems of a long heat treatment production cycle and high production cost. Summary of the Invention

[0006] This invention provides a hot rolling method for 3104 aluminum alloy hot-rolled slabs to solve the above-mentioned technical problems, thereby solving the problems of long heat treatment production cycle and high production cost.

[0007] This invention provides a hot rolling method for 3104 aluminum alloy hot-rolled slabs, comprising:

[0008] Step S10: Homogenize the 3104 aluminum alloy ingot with heat treatment.

[0009] Step S20: The homogenized 3104 aluminum alloy ingot is directly taken out of the furnace for hot rough rolling to obtain a hot rough rolled slab.

[0010] Step S30: The hot rough-rolled slab is subjected to continuous hot finishing rolling to obtain a hot finishing slab.

[0011] In step S20, the hot roughing rolling process consists of m passes. In the first mn passes, the reduction rate per pass is D1, and in the last n passes, the reduction rate per pass is D2, where D1 is greater than D2. By adjusting the roughing rolling pass allocation and the reduction rate per pass, the surface oxide scale of the hot rough-rolled slab is broken down and removed. Through this step,

[0012] In one embodiment, in step S20, the reduction rate D1 ranges from 25% to 35%, and the reduction rate D2 ranges from 10% to 15%. In this step, the reduction rate for each pass is adjusted in accordance with the above method to coordinate with a suitable roughing pass allocation, thereby breaking down and removing the surface oxide scale of the hot-rolled slab. This avoids severe surface oxidation caused by high-temperature rolling, which can lead to surface quality problems. During hot roughing, the 3104 aluminum alloy ingot can be rolled at high temperatures, eliminating the need to lower the temperature to around 500°C as in existing technologies. This shortens the heat treatment production cycle, thereby improving production efficiency and reducing the production cost of 3104 aluminum alloy rolled plates.

[0013] In one embodiment, in step S20, the value of m is in the range of 13≤m≤15, and the value of n is 4.

[0014] In this step, the roughing pass allocation is adjusted in accordance with the above method, and a suitable reduction rate is used to break down and remove the surface oxide scale of the hot rough-rolled slab. This avoids severe surface oxidation caused by high-temperature rolling, which can lead to surface quality problems. During hot roughing, the 3104 aluminum alloy ingot can be rolled at high temperatures, eliminating the need to lower the temperature to around 500℃ as in existing technologies. This shortens the heat treatment production cycle, thereby improving production efficiency and reducing the production cost of 3104 aluminum alloy rolled plates.

[0015] In one implementation, the flow rate of the hot-rolled emulsion spray is increased in the last n passes, the deformation heat generation is controlled by the reduction amount, and the temperature of the hot rough-rolled slab is controlled by the flow rate of the hot-rolled emulsion.

[0016] In one embodiment, the temperature of the hot-rolled slab is T, and the range of temperature T is: 430℃≤T≤460℃.

[0017] In one embodiment, in step S20, the thickness of the hot-rolled slab is K1, and the value range of thickness K1 is: 20mm≤K1≤25mm.

[0018] In one embodiment, in step S10, the holding temperature of the 3104 aluminum alloy ingot during the homogenization heat treatment is 580°C to 600°C, and the holding time is 6h to 12h.

[0019] In one embodiment, in step S20, the initial temperature of the hot-rolled slab before hot rolling is 580°C to 600°C.

[0020] In one embodiment, in step S30, the reduction rate D3 of the last pass in the continuous hot finishing rolling is in the range of 40% ≤ D3 ≤ 50%, and the final rolling temperature of the hot finishing rolling is 330℃-360℃.

[0021] In one embodiment, in step S30, the thickness of the hot-rolled slab is K2, and the value range of thickness K2 is: 2mm≤K2≤2.5mm.

[0022] Compared with existing technologies, the advantages of this invention are as follows: By adjusting the roughing rolling pass allocation and the reduction rate of each pass, the surface oxide scale of the hot rough-rolled slab is destroyed and removed. This avoids the problem of severe surface oxidation and surface quality defects caused by high-temperature rolling. During hot roughing, the 3104 aluminum alloy ingot can be rolled at high temperatures, eliminating the need to lower the temperature to around 500°C as in existing technologies. This shortens the heat treatment production cycle, thereby improving production efficiency and reducing the production cost of 3104 aluminum alloy rolled plates. Attached Figure Description

[0023] Figure 1 This is a flowchart of the hot rolling method for 3104 aluminum alloy hot-rolled slab in an embodiment of the present invention;

[0024] Figure 2 This is a diagram of the mixed crystal structure of Comparative Example 1 in this invention;

[0025] Figure 3 This is a diagram of the mixed crystal structure of Comparative Example 2 in this invention;

[0026] Figure 4 This is a grain structure diagram of Example 1 in this invention;

[0027] Figure 5 This is a diagram of the mixed crystal structure of Comparative Example 3 in this invention;

[0028] Figure 6 This is a grain structure diagram of Example 2 in this invention. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] It should be noted that the 3104 aluminum alloy hot-rolled sheet in this application is mainly used for manufacturing the body of beverage cans. Of course, it is not limited to this and can also be used in other fields.

[0031] like Figure 1As shown, the present invention provides a hot rolling method for 3104 aluminum alloy hot-rolled slab, which includes the following steps:

[0032] Step S10: Homogenize the 3104 aluminum alloy ingot with heat treatment.

[0033] Step S20: The homogenized 3104 aluminum alloy ingot is directly taken out of the furnace for hot rough rolling to obtain a hot rough rolled slab.

[0034] Step S30: The hot rough-rolled slab is subjected to continuous hot finishing rolling to obtain a hot finishing slab.

[0035] In step S20, the hot roughing process consists of m passes. In the first mn passes, the reduction rate for each pass is D1, and in the last n passes, the reduction rate for each pass is D2, with D1 being greater than D2. The surface oxide scale of the hot roughing slab is destroyed and removed by adjusting the roughing pass allocation and the reduction rate for each pass.

[0036] Based on the above steps, the surface oxide scale of the hot-rolled slab is broken and removed by adjusting the roughing pass allocation and the reduction rate of each pass. This avoids the problem of severe surface oxidation and surface quality defects caused by high-temperature rolling (rolling above 550℃). During hot roughing, the 3104 aluminum alloy ingot can be rolled at high temperatures, eliminating the need to lower the temperature to around 500℃ as in existing technologies. This shortens the heat treatment production cycle, thereby improving production efficiency and reducing the production cost of 3104 aluminum alloy rolled plates.

[0037] Specifically, in one embodiment, in step S20, the reduction rate D1 ranges from 25% to 35%, and the reduction rate D2 ranges from 10% to 15%.

[0038] Specifically, in one embodiment, in step S20, the value range of m is: 13≤m≤15.

[0039] Specifically, in one embodiment, in step S20, the flow rate of the hot-rolled emulsion spray is increased in the last n passes, the deformation heat generation is controlled by the reduction amount, and the temperature of the hot rough-rolled slab is controlled by the flow rate of the hot-rolled emulsion.

[0040] It should be noted that a large reduction is used to break down the surface oxide scale caused by high temperature, allowing it to be removed by the hot rolling mill brush and emulsion, thus solving the surface quality problem. In the subsequent n passes, the reduction rate is 10% to 15% per pass, and the flow rate of the hot rolling emulsion spray is increased. The deformation heat generation is controlled by a smaller reduction, and the temperature of the hot roughing slab is controlled by the flow rate of the hot rolling emulsion, ultimately maintaining the temperature at 430-460℃. This provides a lower inlet temperature for subsequent hot continuous rolling, ensuring a high level of deformation energy storage.

[0041] Specifically, in one embodiment, the value of n ranges from 2 to n to 6.

[0042] Furthermore, in one embodiment, n is 4.

[0043] Specifically, in one embodiment, the temperature of the hot-rolled slab is T, and the value of temperature T is in the range of 430℃≤T≤460℃.

[0044] Specifically, in one embodiment, in step S20, the thickness of the hot-rolled slab is K1, and the value range of thickness K1 is: 20mm≤K1≤25mm.

[0045] Specifically, in one embodiment, in step S10, the holding temperature of the 3104 aluminum alloy ingot during the homogenization heat treatment is 580°C to 600°C, and the holding time is 6h to 12h.

[0046] In the above steps, the holding temperature of the ingot during the homogenization heat treatment is set to 580℃-600℃, and the holding time is set to 6h-12h, which can ensure a good homogenization effect.

[0047] Specifically, in one embodiment, in step S10, in step S20, the initial temperature of the hot rough-rolled slab before hot rolling is 580°C to 600°C.

[0048] In the above steps, the starting temperature is 580℃-600℃, which is the holding temperature for homogenization heat treatment. There is no need to cool down before hot rolling, which improves production efficiency.

[0049] Specifically, in one embodiment, in step S10, in step S30, the reduction rate D3 of the last pass in the continuous hot finishing rolling is in the range of 40% ≤ D3 ≤ 50%, and the final rolling temperature of the hot finishing rolling is 330℃-360℃.

[0050] Specifically, in one embodiment, in step S30, the thickness of the hot-rolled slab is K2, and the value range of thickness K2 is: 2mm≤K2≤2.5mm.

[0051] In the above steps, the reduction rate of the last pass is 40%–50%, and the hot finishing rolling temperature is 330℃–360℃, with a hot finishing slab thickness of 2.0mm–2.5mm. Utilizing the mechanism that the energy storage efficiency is highest in the last pass, increasing the reduction rate of the last pass enhances energy storage. Combined with a hot finishing rolling temperature of 330℃–360℃, the material undergoes self-annealing, resulting in a refined recrystallized structure.

[0052] It should be noted that this invention provides a highly efficient hot rolling method for 3104 aluminum alloy hot-rolled slabs used in tank bodies, characterized by short cycle time and low energy consumption. This method completely avoids the problems associated with traditional high-temperature rolling while simultaneously performing high-temperature initial rolling. By optimizing the allocation of roughing passes and adjusting the reduction rate, the surface oxidation problem caused by high-temperature initial rolling is eliminated. Furthermore, by optimizing the allocation of hot roughing passes and adjusting the reduction rate, as well as the allocation of hot finishing passes, combined with the control of hot rolling emulsion flow rate, a synergistic temperature control effect is achieved. This improves the recrystallization energy storage within the material, enabling not only self-annealing recrystallization but also a refined grain structure. The final performance is similar to that of the original process of cooling before hot rolling.

[0053] Example 1

[0054] This invention provides a hot rolling method for 3104 aluminum alloy hot-rolled slabs used in tank bodies. The relevant production process includes: homogenization heat treatment - hot rough rolling - hot finish rolling, as detailed below (including specific process parameters):

[0055] Step 1: Homogenization heat treatment: The homogenization heat treatment temperature is 590℃ and the holding time is 12h.

[0056] Step 2, Hot Rough Rolling: After homogenization and heat preservation, the ingot is directly pushed out of the furnace for hot rough rolling. The hot rough rolling process consists of 13 passes. The reduction rate for the first 9 passes ranges from 30% to 35%, and the reduction rate for the last 4 passes ranges from 10% to 15%. The flow rate of the hot rolling emulsion is increased to lower the temperature. The thickness of the hot rough rolled slab is 20 mm, and the hot rough rolled slab temperature is 460℃.

[0057] Step 3, Hot Finish Rolling: The hot rough-rolled plate is immediately fed into a continuous hot finish rolling mill for hot finish rolling. The reduction rate of the last pass of hot finish rolling is 50%, the final rolling temperature of hot finish rolling is 360℃, and the thickness of the hot finish rolled slab is 2.0mm.

[0058] refer to Figure 4 The grain structure is a fully recrystallized structure with a grain size of about 30 μm and a relatively uniform size distribution, which is beneficial to the subsequent rolling process and the overall uniformity of the material. The finer grains also have a good grain strengthening effect, making it an ideal grain structure.

[0059] Comparative Example 1

[0060] Differences between Comparative Example 1 and Example 1:

[0061] The hot roughing rolling process in Comparative Example 1 consisted of 15 passes, but the reduction rate of all passes was between 20% and 30%, which was not allocated according to the pass allocation scheme of Example 1. The production process was otherwise the same as that in Example 1.

[0062] It should be noted that observation of the hot-rolled slab prepared in Comparative Example 1 revealed two problems: First, the slab surface in Comparative Example 1 exhibited severe oxide layer adhesion, resulting in poor surface quality and unsuitability for subsequent cold rolling. Second, due to the relatively thick slab thickness and high processing rate in the final four passes, the heat of deformation was high. Even increasing the emulsion flow rate failed to achieve adequate cooling, causing the hot rough-rolled slab temperature to reach 480℃. This consumed a significant amount of deformation energy, ultimately resulting in the hot finish-rolled slab failing to complete self-annealing and recrystallization, exhibiting a mixed-grain microstructure (see details...). Figure 2 ).

[0063] refer to Figure 2 The grain structure is a mixed-grain structure of incomplete recrystallization, with residual fibrous grains from hot rolling and equiaxed grains from partial recrystallization coexisting, making it impossible to measure grain size. The inhomogeneity of the mixed-grain structure leads to inhomogeneous material properties, and the mixed-grain structure itself is in a metastable state with a narrow processing window, making effective microstructure control impossible. It is a grain structure that should be avoided as much as possible in industrial production.

[0064] Comparative Example 2

[0065] The differences between Comparative Example 2 and Example 1 are as follows:

[0066] Comparative Example 2 did not increase the hot rolling emulsion flow rate in the last four passes of hot roughing, and the production process was the same as in Example 1 except for the other four passes.

[0067] Observations of the hot-rolled slab prepared in Comparative Example 2 revealed that, due to the lack of increased emulsion flow rate in the last four passes of hot roughing, the hot-rolled slab did not receive adequate cooling, resulting in a slab temperature reaching 475°C. This consumed a significant amount of deformation energy, and ultimately, the hot-finished slab did not complete self-annealing recrystallization, exhibiting a mixed-grain structure (see details). Figure 3 ).

[0068] refer to Figure 3 The grain structure is a mixed-grain structure of incomplete recrystallization, with residual fibrous grains from hot rolling and equiaxed grains from partial recrystallization coexisting, making it impossible to measure grain size. The inhomogeneity of the mixed-grain structure leads to inhomogeneous material properties, and the mixed-grain structure itself is in a metastable state with a narrow processing window, making effective microstructure control impossible. It is a grain structure that should be avoided as much as possible in industrial production.

[0069] Example 2

[0070] The efficient hot rolling method for the 3104 aluminum alloy hot-rolled slab used in this embodiment includes the following production process: homogenization heat treatment - hot rough rolling - hot finish rolling, as detailed below (including specific process parameters):

[0071] Step 1: Homogenization heat treatment: The homogenization heat treatment temperature is 600℃ and the holding time is 6h.

[0072] Step 2, Hot Rough Rolling: After homogenization and heat preservation, the ingot is directly pushed out of the furnace for hot rough rolling. The hot rough rolling process consists of 15 passes. The reduction rate for the first 11 passes ranges from 25% to 30%, while the reduction rate for the last 4 passes ranges from 10% to 15%. The flow rate of the hot-rolled emulsion is increased to lower the temperature. The thickness of the hot-rolled slab is 25 mm, and the hot-rolled slab temperature is 430℃.

[0073] Step 3, Hot Finish Rolling: The hot rough-rolled plate is immediately fed into a continuous hot finish rolling mill for hot finish rolling. The reduction rate of the last pass of hot finish rolling is 40%, the final rolling temperature of hot finish rolling is 330℃, and the thickness of the hot finish rolled slab is 2.5mm.

[0074] See Figure 6 The grain structure is a fully recrystallized structure with a grain size of about 35 μm and a relatively uniform size distribution, which is beneficial to the subsequent rolling process and the overall uniformity of the material. The finer grains also have a good grain strengthening effect, making it an ideal grain structure.

[0075] Comparative Example 3

[0076] The differences between Comparative Example 3 and Example 2 are as follows:

[0077] Comparative Example 3 adopted an average pass allocation during the hot finishing rolling process, with a hot finishing rolling pass reduction rate ranging from 30% to 40%. It did not follow the pass allocation scheme of Example 2. The production process was the same as that of Example 2 except for this.

[0078] Observations on the hot-rolled slab prepared in Comparative Example 3 revealed that, due to the absence of a large reduction rate in the final hot finishing pass, the energy storage of the hot-rolled slab was lower than that in Example 2. After self-annealing, the grain size of the hot-rolled slab in Comparative Example 3 was significantly larger than that in Example 2, which adversely affected subsequent processing and canning (see [link]). Figure 5 ).

[0079] See Figure 5 The grain structure is a fully recrystallized structure, but the grain size is relatively large, approximately 50 μm. Large grains weaken the strengthening effect of fine grains and make it easier for concentrated deformation zones and shear bands to form during subsequent cold rolling deformation, resulting in insufficient mechanical and processing properties of the material.

[0080] It should be noted that the existing homogenization heat treatment process for aluminum alloy sheet ingots used for beverage can bodies involves heating at (580-600)℃ for (6-12) hours, followed by cooling down to 500℃ for 3 hours, resulting in low heat treatment production efficiency. This invention uses (580-600)℃ for (6-12) hours, directly rolling the sheet after it exits the furnace, shortening the heat treatment production cycle by approximately 6 hours and increasing the furnace efficiency by 20%-25%.

[0081] Existing aluminum alloy sheet ingots for beverage can bodies suffer from low furnace temperatures and high deformation resistance, resulting in small reduction per rolling pass, numerous rolling passes, and low production efficiency. Furthermore, the small reduction makes it difficult to break down the compound, and the presence of large-sized compounds leads to a higher can breakage rate during the stamping and thinning process in can manufacturing plants. In short, this invention increases the rolling temperature from 500℃ to 580℃-600℃, increasing the reduction per rolling pass by 20%-30%, reducing the number of rolling passes, improving production efficiency, and simultaneously allowing for more thorough compound breakage.

[0082] It should be noted that this invention performs homogenization heat treatment on 3104 aluminum alloy ingots for tank bodies, and then directly outputs the high-temperature ingots after homogenization heat treatment for hot rolling without cooling measures. By optimizing the pass allocation between hot roughing and hot finishing rolling, the material microstructure targets of compound crushing, hot finishing rolling temperature control, and self-annealing after hot finishing coil winding are simultaneously achieved. This avoids the surface quality problems, coarse grain problems, and incomplete recrystallization problems caused by directly rolling high-temperature ingots, and improves the hot rolling production efficiency of 3104 aluminum alloy hot-rolled slabs for tank bodies.

[0083] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; "link" can mean a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A hot rolling method for 3104 aluminum alloy hot-rolled slab, characterized in that, include: Step S10: Homogenize the 3104 aluminum alloy ingot with heat treatment. Step S20: The 3104 aluminum alloy ingot after homogenization is directly taken out of the furnace for hot rough rolling to obtain a hot rough rolled slab. Step S30: The hot rough-rolled slab is subjected to continuous hot finishing rolling to obtain a hot finishing slab; In step S20, the hot roughing process consists of m passes. In the first mn passes, the reduction rate for each pass is D1, and in the last n passes, the reduction rate for each pass is D2, with D1 being greater than D2. The surface oxide scale of the hot roughing slab is destroyed and removed by adjusting the roughing pass allocation and the reduction rate for each pass. In step S20, the value range of the reduction ratio D1 is 25% ≤ D1 ≤ 35%, and the value range of the reduction ratio D2 is 10% ≤ D2 ≤ 15%. In step S20, the value of m is in the range of 13≤m≤15, and the value of n is 4. In the subsequent n passes, the flow rate of the hot-rolled emulsion spray is increased, the deformation heat generation is controlled by the reduction amount, and the temperature of the hot rough-rolled slab is controlled by the flow rate of the hot-rolled emulsion.

2. The hot rolling method for 3104 aluminum alloy hot-rolled slab according to claim 1, characterized in that, The temperature of the hot-rolled slab is T, and the range of temperature T is: 430℃≤T≤460℃.

3. The hot rolling method for 3104 aluminum alloy hot-rolled slab according to claim 1, characterized in that, In step S20, the thickness of the hot-rolled slab is K1, and the value range of the thickness K1 is: 20mm≤K1≤25mm.

4. The hot rolling method for 3104 aluminum alloy hot-rolled slab according to claim 1, characterized in that, In step S10, the holding temperature of the 3104 aluminum alloy ingot in the homogenization heat treatment is 580°C to 600°C, and the holding time is 6 h to 12 h.

5. The hot rolling method for 3104 aluminum alloy hot-rolled slab according to claim 1, characterized in that, In step S20, the initial temperature of the hot rough-rolled slab before hot rolling is 580°C to 600°C.

6. The hot rolling method for 3104 aluminum alloy hot-rolled slab according to claim 1, characterized in that, In step S30, the reduction rate D3 of the last pass in the continuous hot finishing rolling process is in the range of 40%≤D3≤50%, and the final rolling temperature of the hot finishing rolling is 330℃-360℃.

7. The hot rolling method for 3104 aluminum alloy hot-rolled slab according to claim 1, characterized in that, In step S30, the thickness of the hot-rolled slab is K2, and the value range of the thickness K2 is: 2mm≤K2≤2.5mm.

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