Thermomechanical treatment method for Al-Mg-Si alloy rolled plate

Abstract

The invention discloses a thermomechanical treatment method for an Al-Mg-Si alloy rolled plate, and relates to the technical field of aluminum alloys, and the thermomechanical treatment method comprises the following working procedures of fusion casting, head and tail cutting, surface milling, homogenizing heat treatment, temperature-controlled rolling, solid solution quenching and pre-aging treatment, and after a cast ingot obtained by fusion casting of an aluminum alloy raw material is subjected to head and tail cutting and surface milling, the Al-Mg-Si alloy rolled plate is obtained; and after homogenization heat treatment is conducted, temperature control rolling is directly conducted through waste heat, quenching and pre-aging treatment are conducted after temperature control rolling is completed, and the alloy rolled plate is obtained. According to the method, the purposes of saving energy, simplifying the process flow and improving the production efficiency are achieved, the microstructure of a cast ingot can be regulated and controlled, crystal grains are refined, wrong distribution is improved, the strength of a rolled plate is further improved, the problem that mechanical properties are unstable is solved, and the generation of a rib line is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloys, and in particular to a deformation heat treatment method for an Al-Mg-Si alloy rolled plate. Background Art

[0002] The aluminumization of body covering parts has a positive contribution to lightweight, safety and durability. The hood is affected by the design needs of pedestrian protection and has a higher aluminum ratio. Other covering parts such as doors, trunk lids, fenders, etc. are also gradually being aluminumized. In addition, aluminum alloy has a high recycling value. The increase in aluminum use in the whole vehicle is conducive to the reuse of scrap metal from dismantled vehicles.

[0003] The 6xxx series aluminum alloys used for body panels, including 6016 / 6014 / 6022, are in T4 state before baking, with excellent yield strength ratio, which is conducive to stamping. The stamped parts are strengthened by aging during the electrophoretic painting process. The product thickness is generally 0.8-1.5mm. The conventional production process is: melting and casting → homogenization heat treatment → cutting head and tail → milling surface → hot rolling → cold rolling → intermediate annealing → cold rolling → quenching → pre-aging, and the general baking temperature is 150-220℃. However, the conventional production process is complicated, the process range is narrow, the mechanical properties of the product in T4 state are unstable, and Roping lines are easily generated after stamping. When aluminum alloy sheets are stamped to form automobile panels, band defects closely arranged along the rolling direction are very likely to appear on the surface of the parts, which are called Roping lines. Roping lines are significant quality defects on the surface of automobile panels, which cannot be covered by the part coating and baking process, and will seriously affect the appearance quality of the automobile outer panel. Therefore, it is of vital importance to solve the Luoping line problem on the surface of the plate while simplifying the process flow and improving the parking mechanical properties. Summary of the invention

[0004] In view of the above shortcomings, the present invention provides a method for thermomechanical treatment of Al-Mg-Si alloy rolled plate, which can improve the stability of product mechanical properties, improve microstructure and Luoping line problems, improve production efficiency, increase the tolerance of recycled aluminum at the consumer end, and promote the recycling of recycled aluminum in automobiles. The specific technical scheme is as follows:

[0005] A deformation heat treatment method for Al-Mg-Si alloy rolled plate, comprising the following steps: melting and casting, head and tail cutting, milling, homogenization heat treatment, temperature-controlled rolling, solution quenching, and pre-aging treatment, wherein the ingot obtained by melting and casting the aluminum alloy raw material is subjected to head and tail cutting and surface milling, and then subjected to homogenization heat treatment and then directly subjected to temperature-controlled rolling using residual heat, and after the temperature-controlled rolling is completed, quenching and pre-aging treatment are performed to obtain the alloy rolled plate;

[0006] In the melting and casting step, the chemical composition of the ingot is in percentage by mass: Si: 0.4-1.5%, Fe: 0.1-0.5%, Mn: 0.1-0.5%, Cu: 0.1-0.5%, Mg: 0.3-1.0%, Cr: ≤0.25%, Zn: ≤0.3%, Ti: ≤0.1%, and the remainder is Al and other inevitable impurities.

[0007] Preferably, the temperature of the homogenization heat treatment process is 550-580° C. and the time is 8-20 hours.

[0008] Preferably, the temperature-controlled rolling process specifically includes: maintaining the alloy temperature at 450-500°C and rolling to a thickness of 50mm-100mm, promoting the crushing of coarse Fe-rich phase and T phase (Al2CuMg) and the precipitation of fine T phase, and promoting the atomic dissolution of coarse primary phases including β(Mg2Si), S(Al2CuMg), Q(Al5 Cu2 Mg8 Si6) and θ(Al2Cu) during the high-temperature crushing process, wherein the type and proportion of the primary phase are affected by the actual composition, and when the alloy temperature is naturally cooled to 200-250°C, the temperature is maintained and rolled to a thickness of 10mm-20mm, which is conducive to the crushing and atomic dissolution of small-sized β, S and θ, and when the alloy temperature is naturally cooled to 100-150°C, the temperature is maintained and rolled to a thickness of ≤1.5mm.

[0009] Preferably, the temperature of the solution quenching process is 480-520° C. and the time is 0.5-10 min.

[0010] Preferably, the cooling rate of the solution quenching process is 40-60°C / s.

[0011] Preferably, the temperature of the pre-aging treatment process is 100-150° C. and the time is 6-30 hours.

[0012] Preferably, in the temperature-controlled rolling process, the ingot thickness is greater than 55 mm, and the total rolling processing rate is greater than 99.5%.

[0013] Preferably, the ingot is a flat ingot with a width-to-thickness ratio of less than 50%.

[0014] Preferably, the aluminum in the aluminum alloy raw material also includes recycled aluminum from the consumer end.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. A deformation heat treatment method for Al-Mg-Si alloy rolled plate of the present invention includes the following steps: melting, cutting, milling, homogenization heat treatment, temperature-controlled rolling, solution treatment, and pre-aging. The present invention controls the temperature of the homogenization heat treatment, and then uses the residual heat of the heat treatment to implement multi-stage temperature-controlled rolling, and combines the pre-aging treatment step. The segmented temperature-controlled hot rolling process of the scheme effectively breaks up different types of second phases and promotes dissolution, so that the alloy solute atoms are more fully dissolved in the subsequent quenching. Due to the increase in nucleation, the recrystallized grains are fine, and the GP zone formed by pre-aging is more dispersed and uniform, and the bake hardening value is improved. Through the implementation of this scheme, the average size of dispersed phases such as Fe-rich phase and T phase (Al2CuMg) can be refined to less than 1μm, the average grain size is <20μm, and the bake hardening value increment is >80MPa. The present invention not only achieves the purpose of energy saving, simplifies the process flow and improves production efficiency, but also can regulate the microstructure of the ingot, regulate the distribution and size of the precipitated phase, refine the grains, improve the staggered distribution, further improve the strength of the rolled plate, improve the problem of unstable parking mechanical properties, and avoid the generation of Luoping lines.

[0017] 2. The present invention can use recycled aluminum from the consumer end as raw material, does not affect the mechanical properties of the product, increases the tolerance of recycled aluminum from the consumer end, and promotes the recycling of recycled aluminum in automobiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. Unless otherwise defined, all professional terms used hereinafter have the same meaning as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention. Unless otherwise specifically stated, various raw materials, reagents, instruments and equipment used in the present invention, etc. can be purchased from the market or can be prepared by existing methods.

[0021] As an example, the aluminum used in the embodiment of the present invention is recycled aluminum from the consumer end, but the present invention is not limited to this.

[0022] Example 1

[0023] This embodiment provides a method for thermomechanical treatment of Al-Mg-Si alloy rolled plate, including the following steps: melting, cutting, milling, homogenizing heat treatment, temperature-controlled rolling, solution quenching, and pre-aging treatment. The specific steps are:

[0024] 1) Melting and casting: The raw materials are placed in a melting furnace for melting and casting to obtain an ingot; the mass percentage of chemical elements of the ingot after melting and casting is: Si: 0.75%, Fe: 0.21%, Mn: 0.34%, Cu: 0.36%, Mg: 0.56%, Cr: 0.13%, Zn: 0.22%, Ti: 0.07%, and the balance is Al and other inevitable impurities.

[0025] 2) Head and tail trimming and surface milling: the ingot is subjected to head and tail trimming and surface milling to obtain a milled ingot.

[0026] 3) Homogenization heat treatment: The ingot after milling is subjected to homogenization heat treatment at a temperature of 565° C. for a holding time of 15 h to obtain a heat-treated ingot with a thickness of 60 mm.

[0027] 4) Temperature-controlled rolling: The heat-treated ingot is subjected to temperature-controlled rolling, and the temperature is maintained at 480°C and rolled to a thickness of 55 mm. When the temperature is naturally cooled to 225°C, the temperature is maintained and rolled to a thickness of 15 mm. When the temperature is naturally cooled to 125°C, the temperature is maintained and rolled to a thickness of 1.2 mm to obtain an aluminum alloy that has been temperature-controlled rolled.

[0028] 5) Solution quenching: The aluminum alloy that has been temperature-controlled rolled is solution quenched at 500°C for 5 minutes and then cooled at a cooling rate of 50°C / s.

[0029] 6) Pre-aging treatment: The aluminum alloy after solution quenching is subjected to pre-aging treatment at a temperature of 125° C. for 18 h to obtain the aluminum alloy plate with a thickness of 1.2 mm.

[0030] Example 2

[0031] This embodiment provides a method for thermomechanical treatment of Al-Mg-Si alloy rolled plate, including the following steps: melting, cutting, milling, homogenizing heat treatment, temperature-controlled rolling, solution quenching, and pre-aging treatment. The specific steps are:

[0032] 1) Melting and casting: Put the raw materials into a melting furnace and melt and cast to obtain an ingot; the mass percentage of the chemical elements of the ingot after melting and casting is: Si: 0.49%, Fe: 0.38%, Mn: 0.22%, Cu: 0.36%, Mg: 0.82%, Cr: 0.20%, Zn: 0.19%, Ti: 0.03%, and the balance is Al and other inevitable impurities.

[0033] 2) Head and tail trimming and surface milling: the ingot is subjected to head and tail trimming and surface milling to obtain a milled ingot.

[0034] 3) Homogenization heat treatment: The milled ingot is subjected to homogenization heat treatment at a temperature of 550° C. for 8 h to obtain a heat-treated ingot with a thickness of 60 mm.

[0035] 4) Temperature-controlled rolling: The heat-treated ingot is subjected to temperature-controlled rolling, and the temperature is maintained at 450°C and rolled to a thickness of 55 mm. When the temperature is naturally cooled to 200°C, the temperature is maintained and rolled to a thickness of 15 mm. When the temperature is naturally cooled to 100°C, the temperature is maintained and rolled to a thickness of 1.2 mm to obtain an aluminum alloy that has been temperature-controlled rolled.

[0036] 5) Solution quenching: The aluminum alloy that has been temperature-controlled rolled is solution quenched at 480°C for 10 minutes, then cooled at a cooling rate of 40°C / s.

[0037] 6) Pre-aging treatment: The aluminum alloy after solution quenching is subjected to pre-aging treatment at a temperature of 100° C. for 30 h to obtain the aluminum alloy plate with a thickness of 1.2 mm.

[0038] Example 3

[0039] This embodiment provides a method for thermomechanical treatment of Al-Mg-Si alloy rolled plate, including the following steps: melting, cutting, milling, homogenizing heat treatment, temperature-controlled rolling, solution quenching, and pre-aging treatment. The specific steps are:

[0040] 1) Melting and casting: the raw materials are placed in a melting furnace for melting and casting to obtain an ingot; the mass percentage of chemical elements of the ingot after melting and casting is: Si: 1.17%, Fe: 0.45%, Mn: 0.18%, Cu: 0.41%, Mg: 0.42%, Cr: 0.11%, Zn: 0.13%, Ti: 0.02%, and the balance is Al and other inevitable impurities.

[0041] 2) Head and tail trimming and surface milling: the ingot is subjected to head and tail trimming and surface milling to obtain a milled ingot.

[0042] 3) Homogenization heat treatment: The ingot after milling is subjected to homogenization heat treatment at a temperature of 580° C. for a holding time of 8 h to obtain a heat-treated ingot with a thickness of 60 mm.

[0043] 4) Temperature-controlled rolling: The heat-treated ingot is subjected to temperature-controlled rolling, and the temperature is maintained at 500°C and rolled to a thickness of 55 mm. When the temperature is naturally cooled to 250°C, the temperature is maintained and rolled to a thickness of 15 mm. When the temperature is naturally cooled to 150°C, the temperature is maintained and rolled to a thickness of 1.2 mm to obtain an aluminum alloy that has been temperature-controlled rolled.

[0044] 5) Solution quenching: The aluminum alloy that has been temperature-controlled rolled is solution quenched at 520°C for 2 minutes, then cooled at a cooling rate of 60°C / s.

[0045] 6) Pre-aging treatment: The aluminum alloy after solution quenching is subjected to pre-aging treatment at a temperature of 150° C. for 8 h to obtain the aluminum alloy sheet with a thickness of 1.2 mm.

[0046] Comparative Example 1

[0047] The difference from Example 1 is that the rolling process is different, which is gradient cooling rolling. After each rolling, the metal temperature drops by more than 15°C, and the final metal temperature is less than 100°C. The remaining processes are the same as Example 1.

[0048] Comparative Example 2

[0049] The difference from Example 1 is that the temperature of the temperature-controlled rolling is different. The specific steps of the temperature-controlled rolling are: temperature-controlled rolling is performed on the heat-treated ingot, the temperature is kept at 400°C and rolled to a thickness of 40 mm, when the temperature is naturally cooled to 170°C, the temperature is kept at this temperature and rolled to a thickness of 8 mm, and when the temperature is naturally cooled to 80°C, the temperature is kept at this temperature and rolled to a thickness of 1.0 mm. The remaining processes are the same as in Example 1.

[0050] Comparative Example 3

[0051] The difference from Example 1 is that no pre-aging treatment is performed, and the aluminum alloy plate is obtained by direct natural cooling after the solid solution quenching. The remaining processes are the same as those in Example 1.

[0052] Comparative Example 4

[0053] This comparative example is a conventional production process, including: melting and casting, homogenizing heat treatment, head and tail cutting, milling, hot rolling, cold rolling, intermediate annealing, cold rolling, quenching, and pre-aging treatment. The specific procedures are as follows:

[0054] 1) Melting and casting: After melting in a melting furnace, an aluminum alloy ingot is cast to prepare the aluminum alloy ingot, the mass percentage of chemical elements of the ingot is: Si: 0.72%, Fe: 0.18%, Mn: 0.35%, Cu: 0.22%, Mg: 0.61%, Cr: 0.10%, Zn: 0.23%, Ti: 0.05%, and the balance is Al and other inevitable impurities;

[0055] 2) Homogenization treatment: The aluminum alloy ingot is heated in a homogenization heat treatment furnace and heated to 570°C at a heating rate of 50°C / h for 12 hours;

[0056] 3) Hot rough rolling: the total deformation of hot rough rolling is 75%;

[0057] 4) Hot finishing rolling: the hot finishing rolling start temperature is 460°C, the hot finishing rolling coiling temperature is 300°C, and the total hot finishing rolling deformation is 88%;

[0058] 5) Intermediate annealing: The temperature of intermediate annealing is 400°C, the holding time is 2h, the heating rate of intermediate annealing is 16°C / h, and the cooling rate of intermediate annealing is 13°C / h;

[0059] 6) Cold rolling: The total deformation of cold rolling is 80%;

[0060] 7) Solution quenching: The solution treatment temperature is controlled at 560°C, the solution heating rate is 22°C / s, the solution treatment time is 3min, and then water cooling quenching is used.

[0061] 8) Pre-aging treatment: The pre-aging treatment was immediately carried out within 3 minutes, and the temperature was slowly reduced from 90°C to room temperature at a cooling rate of 3°C / h to obtain a T4P aluminum alloy sheet.

[0062] Comparative Example 5

[0063] The deformation heat treatment method of this comparative example comprises the following steps:

[0064] This embodiment provides a method for thermomechanical treatment of Al-Mg-Si alloy rolled plate, including the following steps: melting, cutting, milling, homogenizing heat treatment, temperature-controlled rolling, solution quenching, and pre-aging treatment. The specific steps are:

[0065] 1) Melting and casting: Put the raw materials into a melting furnace and melt and cast to obtain an ingot; the mass percentage of the chemical elements of the ingot after melting and casting is: Si: 0.69%, Fe: 0.21%, Mn: 0.30%, Cu: 0.36%, Mg: 0.52%, Cr: 0.11%, Zn: 0.29%, Ti: 0.06%, and the balance is Al and other inevitable impurities.

[0066] 2) Head and tail trimming and surface milling: the ingot is subjected to head and tail trimming and surface milling to obtain a milled ingot.

[0067] 3) Homogenization heat treatment: The ingot after milling is subjected to homogenization heat treatment at a temperature of 565° C. for a holding time of 15 h to obtain a heat-treated ingot with a thickness of 60 mm.

[0068] 4) Rolling: The ingot after homogenization heat treatment is directly subjected to hot rough rolling and hot finish rolling, the start rolling temperature of hot finish rolling is controlled to be 450°C, and the hot final rolling temperature is controlled to be above 300°C;

[0069] 5) Cold rolling: control the total cold rolling deformation to 70%;

[0070] 6) Solution quenching: The rolled aluminum alloy is solution quenched at 500°C for 5 minutes, then cooled at a cooling rate of 50°C / s.

[0071] 7) Pre-aging treatment: The aluminum alloy after solution quenching is subjected to pre-aging treatment at a temperature of 125° C. for 18 h to obtain the aluminum alloy sheet.

[0072] 1. Luoping line test

[0073] Rectangular specimens of 250mm (rolling direction) × 35mm (transverse direction) were cut from the aluminum alloy sheet samples corresponding to each embodiment 1-3 and comparative example 1-5 for Luoping line defect evaluation. The polishing of the Luoping line defect evaluation specimen needs to be carried out on a flat work surface. First, oil paper is placed under the specimen to facilitate cleaning after the test. Black ink is evenly applied to the surface of the specimen, and the volatilization time is waited for 15 seconds. Then a sponge pad with sandpaper on the surface is used to polish the surface of the specimen. During polishing, slight pressure needs to be applied to the surface of the specimen. Generally, it is polished unidirectionally along its rolling direction 3 times, and then the Luoping line defects are graded: Level 1: The surface is required to have no vertical stripes parallel to the rolling direction; Level 2: The surface is allowed to have 1-5 vertical stripes parallel to the rolling direction; Level 3: The number of vertical stripes parallel to the rolling direction on the surface exceeds 5; Level 4: The number of vertical stripes parallel to the rolling direction on the surface exceeds 5 and the spacing between the vertical stripes is less than 3mm. The results are shown in Table 1.

[0074] 2. Parking mechanical performance test

[0075] The aluminum alloy plates in Examples 1-3 and Comparative Examples 1-5 were kept at room temperature for 7 days, 40 days and 100 days of natural aging, respectively, and the stability of natural aging was evaluated by testing the mechanical properties of these aluminum alloy plates. The mechanical properties were tested according to ASTM standards, and the test items included 0.2% yield strength, tensile strength, and total elongation. The uniaxial tensile properties (T4 state) of the aluminum alloy plates after natural aging were tested. The results are shown in Table 2 below.

[0076] Table 1 Evaluation grade table of Luoping wire of Examples 1-3 and Comparative Examples 1-5

[0077] Group Average size of dispersed phase (μm) Average grain size (μm) Luoping wire defect grade evaluation Example 1 0.92 19 Level 1 Example 2 0.96 16 Level 1 Example 3 0.88 18 Level 1 Comparative Example 1 1.03 25 Level 2 Comparative Example 2 1.55 28 Level 3 Comparative Example 3 0.99 20 Level 1 Comparative Example 4 1.56 29 Level 2 Comparative Example 5 1.85 27 Level 3

[0078] Table 2 Parking mechanics test results of Examples 1-3 and Comparative Examples 1-5

[0079]

[0080]

[0081] In summary, the Al-Mg-Si alloy rolled plate deformation heat treatment method of the embodiment of the present invention controls the temperature of the homogenization heat treatment, and then uses the waste heat of the heat treatment to implement multi-stage temperature-controlled rolling, and combines the pre-aging treatment step to refine the average size of dispersed phases such as Fe-rich phase and T phase (Al2CuMg) to less than 1μm, the average grain size is less than 20μm, and the bake hardening value increment is greater than 80MPa. The present invention not only achieves the purpose of energy saving, simplifies the process flow, and improves production efficiency, but also can regulate the microstructure of the ingot, refine the grains, improve the staggered distribution, further improve the strength of the rolled plate, improve the problem of unstable parking mechanical properties, and avoid the generation of Luoping lines; the embodiment of the present invention uses consumer-end recycled aluminum as raw material, which does not affect the mechanical properties of the product, improves the tolerance of consumer-end recycled aluminum, and promotes the recycling of automotive recycled aluminum.

[0082] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for thermomechanical treatment of Al-Mg-Si alloy rolled sheet, characterized in that: The method comprises the following steps: melting and casting, trimming, milling, homogenizing heat treatment, temperature-controlled rolling, solution quenching, and pre-aging treatment. The ingot obtained by melting and casting the aluminum alloy raw material is trimmed, milled, homogenized, and heat-treated, and then temperature-controlled rolling is directly performed using residual heat. After the temperature-controlled rolling is completed, quenching and pre-aging treatment are performed to obtain the alloy rolled plate. In the melting and casting step, the chemical composition of the ingot is in percentage by mass: Si: 0.4-1.5%, Fe: 0.1-0.5%, Mn: 0.1-0.5%, Cu: 0.1-0.5%, Mg: 0.3-1.0%, Cr: ≤0.25%, Zn: ≤0.3%, Ti: ≤0.1%, and the remainder is Al and other inevitable impurities.

2. The method for thermomechanical treatment of Al-Mg-Si alloy rolled plate according to claim 1, characterized in that: The temperature of the homogenization heat treatment process is 550-580° C. and the time is 8-20 hours.

3. The method for thermomechanical treatment of Al-Mg-Si alloy rolled plate according to claim 1, characterized in that: The temperature-controlled rolling process specifically includes: maintaining the alloy temperature at 450-500°C and rolling to a thickness of 50mm-100mm, maintaining the temperature when the alloy temperature naturally cools to 200-250°C and rolling to a thickness of 10mm-20mm, and maintaining the temperature when the alloy temperature naturally cools to 100-150°C and rolling to a thickness of ≤1.5mm.

4. The method for thermomechanical treatment of Al-Mg-Si alloy rolled plate according to claim 1, characterized in that: The temperature of the solution quenching process is 550-580° C. and the time is 0.5-10 min.

5. The method for thermomechanical treatment of Al-Mg-Si alloy rolled plate according to claim 1, characterized in that: The temperature of the pre-aging treatment process is 100-150° C. and the time is 6-30 hours.

6. The method for thermomechanical treatment of Al-Mg-Si alloy rolled plate according to claim 1, characterized in that: In the temperature-controlled rolling process, the thickness of the ingot before the temperature-controlled rolling is greater than 55 mm, and the total rolling processing rate is greater than 99.5%.

7. The method for thermomechanical treatment of Al-Mg-Si alloy rolled plate according to claim 1, characterized in that: The aluminum in the aluminum alloy raw material also includes recycled aluminum from the consumer end.

8. The method for thermomechanical treatment of Al-Mg-Si alloy rolled plate according to claim 4, characterized in that: The cooling rate of the solution quenching process is 40 to 60° C. / s.

9. An alloy rolled plate obtained by the Al-Mg-Si alloy rolled plate deformation heat treatment method as claimed in any one of claims 1 to 8.

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