Cast rolling process of ultra-wide 5052 aluminum alloy plate strip

Abstract

A cast rolling process of an ultra-wide 5052 aluminum alloy plate strip comprises the following steps that (1) smelting is conducted, specifically, the ultra-wide 5052 aluminum alloy plate strip comprises, by weight, 0.03%-0.09% of Si, 2.2%-2.8% of Mg, 0.3%-0.8% of Fe, 0.1%-0.5% of Mn, 0.002%-0.012% of Cu and the balance Al and inevitable impurities; (2) casting is conducted, the refining temperature ranges from 720 DEG C to 750 DEG C, online grain refinement is conducted, a grain refiner Ti powder is added, and the adding amount ranges from 0.005% to 0.01%; the casting temperature is 700-720 DEG C, the width of a cast ingot is at least 2500mm, and the thickness is 650-670mm; 3) heating the cast ingot at the temperature of 460-490 DEG C for 3-5 hours; (4) rough rolling is conducted, specifically, at least one pass of vertical rollers is used before head and tail cutting, and the edge rolling amount of each pass is 12-20 mm; the total reduction rate of rough rolling is 92-96%, the thickness of an intermediate billet is 32-38 mm, and the minimum width is 2500 mm; (5) finish rolling is conducted, the finish rolling temperature ranges from 460 DEG C to 490 DEG C, and the finish rolling reduction rate ranges from 81% to 85%; and (6) coiling, wherein the coiling temperature is 320-340 DEG C.

Description

Technical Field

[0001] The invention relates to the field of aluminum alloy melting, casting and hot rolling, and in particular to a casting and rolling process of an ultra-wide 5052 aluminum alloy strip. Background Art

[0002] 5052 aluminum alloy is a typical alloy in 5xxx series alloys, with Mg content between 2.2% and 2.8%. Among 5 series aluminum alloys, 5052 has a low Mg content and cannot be strengthened by heat treatment. It is an aluminum alloy that can be used after processing, with medium strength, good corrosion resistance, weldability and easy processing and forming. 5052 aluminum alloy has good plasticity in annealing state and high work hardening rate, so it has low plasticity in hard state. In 5052 aluminum alloy, Mg is its only strengthening element, which has a certain solid solution strengthening effect, and improves the work hardening rate of the alloy, and the alloy can obtain more obvious strain strengthening.

[0003] 5052 alloy is often used as a decorative panel material due to its excellent forming performance, corrosion resistance, weldability, and fatigue strength. With the development of related industries such as machinery and automobiles, the demand for 5052 aluminum alloy plates is increasing, and the forming requirements for plates and strips are also increasing. Ultra-wide aluminum alloy plates and strips refer to aluminum alloy plates and strips with a width of more than 2300mm. Today, with the vigorous development of productivity, the demand for ultra-wide 5052 aluminum alloy is increasing. Increasing the rolling width can greatly reduce the difficulty of subsequent processing, reduce welding, connection and other processes, and help reduce costs.

[0004] The difficulty of ultra-wide rolling of 5052 aluminum alloy lies in the plate shape control during the rolling process, which requires strict control of the speed during the rolling process. If the speed is too low, the material temperature drops too quickly, affecting the rolling; if the speed is too fast, the plate shape control becomes more difficult. Therefore, research on the related processes of ultra-wide rolling of 5052 aluminum alloy has become a hot demand in the market.

[0005] Chinese patent CN202111154159.5 discloses a new type of environmentally friendly 5052 aluminum alloy sheet and preparation method. The alloy chemical composition of the aluminum alloy sheet is as follows: Si 0.25-0.50%, Fe 0.30-0.50%, Cu0-0.20%, Mn 0.23-0.28%, Mg 2.85-3.10%, Cr 0-0.20%, Zn 0-0.20%, Ti 0.025-0.035%, and the balance is Al. Process waste and / or purchased waste are used as raw materials for smelting, and the ingredients are mixed during the smelting process so that the resulting alloy liquid meets the requirements of the alloy element composition; then refining, casting, sawing and milling, homogenization heat treatment, hot rough rolling, hot finishing rolling, cold rolling finished products, cleaning, annealing, straightening finished products, and finally packaging.Specifically, it includes: a. Smelting: using process waste and / or purchased waste as raw materials, adding process waste and / or purchased waste into a flame reflection furnace for heating and smelting, controlling the smelting temperature in the furnace to be 720-760°C, stirring to remove scum after all the raw materials in the furnace are melted, and obtaining the original alloy liquid; then adding 100% pure magnesium ingot, No. 2 solvent anhydrous magnesium chloride, Al-20Mn and Al-5Ti-B for batching, the batching temperature is 730-750°C, and the alloy components in the alloy liquid obtained by smelting meet the alloy element composition of the billet; b. Refining: the alloy liquid obtained in step a) is subjected to Refining is performed, and the temperature is controlled at 735±15℃ and the refining time is 30-60min during the refining process; after the refining is completed, slag removal and standing are performed in sequence, and the standing time is 20-40min; c. Casting: the aluminum alloy liquid obtained after the refining in step b) is subjected to primary and secondary plate filtration, online degassing, deep bed filtration or tubular filtration in sequence, and the alloy liquid obtained after filtration is cast into an aluminum alloy flat ingot; d. Sawing and milling: the aluminum alloy flat ingot obtained in step c) is first sawed, and the saw head is 150-300mm; then milling is performed, and the single-side milling amount of the large surface is 11-20mm, and the milling amount of the small surface is 7-15mm; e. 1. Homogenization heat treatment: the net ingot obtained in step d) is subjected to secondary homogenization heat treatment in a heat treatment furnace; f. Hot rough rolling: the plate ingot obtained after the heat treatment in step e) is subjected to 17 to 19 passes of rough rolling to be rolled into an intermediate plate with a thickness of 35 mm, and the inlet temperature of the rough rolling is 490 to 520°C; g. Hot finishing rolling: the intermediate plate obtained in step f0 is subjected to 4 continuous rolling passes to be rolled into a hot rolled billet coil with a thickness of 7.0 mm, the inlet temperature of the finishing rolling is 440 to 470°C, and the final rolling temperature is 330 to 350°C; h. Cold rolled finished product: the aluminum alloy billet coil obtained after the hot finishing rolling is cold rolled to obtain a 1.5 to 3. 5mm thick cold-rolled coil; i. Cleaning: The surface of the cold-rolled finished coil is cleaned, the cleaning water temperature is 55°C, the line speed is 85-100m / min, and the elongation is 0-0.1%; j. Annealing: The coil obtained after cleaning is annealed; during the annealing process, the furnace gas is set to 240°C in the first stage, oil is blown for 2h, and N2 is filled for protection; the furnace gas temperature is set to 370°C in the second stage, the metal temperature rises to 325°C, and the furnace gas temperature is changed to 350°C in the third stage, and it is kept warm for 3h; k. Straightening finished product: The coil obtained after annealing is straightened; during the straightening process, the unwinding tension is 900-2300N / mm. 2 , coiling tension is 2300~3000N / mm 2 , line speed is 85-150m / min, elongation is 0-0.3%; 1. Packaging: Cool the aluminum coil after straightening to below 40℃ and then pack it.

[0006] Chinese patent CN202010654042.2 discloses a method for preparing 5052 aluminum alloy strip, which is characterized by comprising the following steps: Step 1, smelting: the melt is composed of the following components in weight percentage: Fe≤0.30%, Mg2.2-2.6%, Ti0.01-0.05%, Cr0.15-0.30%, Si≤0.20%, Cu≤0.10%, impurities≤0.15%, and the balance is Al, Aluminum ingots and solid materials such as waste materials of the same grade account for 25-35% of the total weight of the melt, and the rest is electrolytic aluminum liquid. The smelting temperature is controlled at 740-750°C, the smelting time is 8-10h, the static furnace temperature is controlled at 735-745°C, and the refining time is 30min; Step 2, casting and rolling: The melt obtained in step 1 is cast and rolled using a double-roll inclined casting and rolling mill, the upper roll of the casting and rolling mill uses a copper alloy steel roll sleeve, and the lower roll uses an alloy steel roll sleeve; the front box uses The high-precision laser flow control system controls the liquid level; the degassing box uses silicon nitride rotor for online degassing, the online refining gas is argon, and the filter box uses a double-stage ceramic filter plate to filter the melt; the grain refiner uses Al-5Ti-1B alloy; the roller surface lubrication adopts graphite spraying technology; the casting and rolling zone length is 40-45mm, the front box temperature is controlled at 710-720℃, the casting and rolling speed is controlled at 800-850mm / min, and the cooling water temperature is 30-33℃. The thickness of the cast-rolled billet is 8.5±0.2mm; Step 3, pre-processing and homogenization annealing: the cast-rolled billet obtained in step 2 is subjected to cold rolling pre-processing with a processing rate of 20-30% in one pass, and the pre-processed billet is subjected to homogenization annealing, the homogenization annealing temperature is 500-550℃, and the holding time is 20-30h; Step 4, cold rolling: the billet obtained in step 3 after homogenization annealing is cold rolled, and the unwinding tension is controlled at 25-28N / mm 2 , winding tension is 30-35N / mm 2 , the rolling speed is controlled at 400-700 mm / min, the strip thickness is reduced to 1.35 mm in four passes, and the strip is cold-rolled after trimming. After two passes of rolling, the strip thickness is reduced from 1.35 mm to a finished product thickness of 0.78 mm; Step 5, finished product annealing: the cold-rolled strip obtained in step 4 is heated to 300-350° C., kept warm for 30-100 min, and cooled to room temperature with the furnace to obtain a 5052 aluminum alloy strip whose mechanical properties meet the requirements of the national standard GB / T 3880.2-2012.

[0007] Chinese patent CN107142399 discloses "a process for preparing aluminum alloy and ultra-wide aluminum alloy sheet", which mainly involves 6061-T651 aluminum alloy, whose width only reaches 1300mm, and does not involve the rolling of 2550mm ultra-wide aluminum alloy.

[0008] Chinese patent CN101935786A discloses "a stabilization treatment method for 5052 aluminum alloy", which includes A. rolling: selecting aluminum alloy coils or plates and hot rolling or / and cold rolling them to a thickness of 1.0-3.0 mm; B. intermediate annealing: intermediate annealing the aluminum alloy coils or plates after rolling at a temperature of 520-580°C for 10-15 hours; C. cold rolling: cold rolling the aluminum alloy coils or plates after intermediate annealing at a cold deformation processing rate of 20%-50% to obtain a 5052 aluminum alloy material with stable performance. Summary of the invention

[0009] The purpose of the present invention is to provide a casting and rolling process for ultra-wide 5052 aluminum alloy plates and strips, which can achieve ultra-wide rolling while ensuring the performance of the 5052 aluminum alloy itself, and the width of the plate and strip is at least 2500mm; and the hot rolling process path provided by the present invention does not require equipment modification, and ultra-wide 5052 hot-rolled aluminum alloy plates and strips can be processed and manufactured on existing equipment; the processed products can be widely used in the fields of automobiles, oil tank liners, luggage compartment covers and corrosion-resistant decorations of buildings, providing broad space for the automotive industry in terms of lightweighting, reducing energy consumption and improving fuel economy, and ultra-wide aluminum plates can reduce subsequent processing procedures, reduce connection welding, etc., and have good economic applicability.

[0010] To achieve the above object, the technical solution of the present invention is:

[0011] A casting and rolling process for ultra-wide 5052 aluminum alloy strips, comprising the following steps:

[0012] 1) Smelting

[0013] The chemical composition is smelted according to the following chemical composition weight percentage: Si: 0.03-0.09%, Mg: 2.2-2.8%, Fe: 0.3-0.8%, Mn: 0.1-0.5%, Cu: 0.002-0.012%, and the rest is Al and other unavoidable impurities; and the content of a single impurity is ≤0.05%, and the total impurity content is ≤0.15%;

[0014] 2) Casting

[0015] Pre-casting refining, refining temperature 720 ~ 750 ℃, during which online grain refinement, adding grain refiner Ti powder, adding Ti 0.005 ~ 0.01% according to the total weight ratio of the melt in the smelting furnace; Casting temperature is 700 ~ 720 ℃, the ingot rough size width is at least 2500mm, thickness is 650 ~ 670mm, and the length is based on production requirements;

[0016] 3) Ingot heating

[0017] Heating temperature 460~490℃, heating time 3~5h;

[0018] 4) Rough rolling

[0019] Use at least one vertical roller before rough rolling and trimming, and the edge rolling amount for each pass is 12 to 20 mm;

[0020] The total reduction rate of rough rolling is 92% to 96%, and the intermediate billet is obtained. The thickness of the intermediate billet is 32 to 38 mm and the minimum width is 2500 mm.

[0021] 5) Finish rolling

[0022] The finishing rolling temperature is controlled at 460-490°C, and the finishing rolling reduction rate is 81%-85%;

[0023] 6) Coiling

[0024] Coiling temperature 320~340℃.

[0025] Preferably, in step 2), during the casting process, the water flow rate of the casting crystallizer is 130-170 m 3 / h.

[0026] Preferably, in step 2), a tubular filter box is used to filter impurities after online degassing.

[0027] Preferably, in step 2), refining before casting: refining time in a pre-casting holding furnace: 30 to 60 minutes; preferably, the casting speed is 50 to 65 mm / min.

[0028] Preferably, in step 3), the heating temperature is 475-485°C.

[0029] Preferably, in step 3), the ingot is heated to temperature and then kept warm for 1 to 3 hours.

[0030] Preferably, in step 4), the rough rolling is performed for 19 or 21 times, the rough rolling bite speed is 1.3 to 2.3 m / s, and the rough rolling speed is 2.4 to 3.6 m / s.

[0031] Preferably, step 5) finishing rolling adopts a three-stand production line, the F1 rolling speed is 1.5-3m / s, the F2 rolling speed is 2-4m / s, and the F3 rolling speed is 3-5m / s; the F1 reduction rate is 46-49%, the F2 reduction rate is 44-46%, and the F3 reduction rate is 42-43%.

[0032] Preferably, the winding tension in step 6) is 12 to 15 N / mm. 2 .

[0033] In the casting and rolling process of the ultra-wide 5052 aluminum alloy strip of the present invention:

[0034] 1. Composition design of the ultra-wide 5052 aluminum alloy strip

[0035] Si: It is the main component for improving the fluidity of aluminum alloys. It can greatly improve the casting properties of aluminum alloys. Adding a certain amount of Si can improve the tensile strength, hardness and corrosion resistance of aluminum alloys. However, adding a higher amount of Si will cause hard particles containing Si to appear in the aluminum alloy, resulting in increased brittleness of the alloy and deterioration of cutting performance. Therefore, the range of Si content in the present invention is controlled to be 0.03-0.09%.

[0036] Mg: It can improve the strength, hardness, heat resistance, corrosion resistance and cutting performance of aluminum alloys. However, adding more Mg will easily cause hot brittleness, cracks in the alloy, and the Mg2Si formed will make the alloy brittle. Therefore, the Mg content in the present invention is controlled to be 2.2-2.8%.

[0037] Fe: FeAl3, Fe2Al or Al-Si-Fe flaky or needle-like structures will be formed in aluminum alloys, which will reduce the mechanical properties. This structure will also reduce the fluidity of the alloy and increase the tendency of hot cracking. Therefore, the Fe content in the present invention is controlled in the range of 0.3-0.8%.

[0038] Mn: It can reduce the harmful effects of Fe in aluminum alloys, and can transform the lamellar or needle-like structures formed by Fe in aluminum alloys into fine crystal structures. Mn can organize the recrystallization process of aluminum alloys, increase the recrystallization temperature, and significantly refine the recrystallized grains; too high Mn can cause segregation and reduce thermal conductivity. Therefore, the Mn content in the present invention is controlled to be in the range of 0.1-0.5%.

[0039] Cu: Solid solution of Cu in aluminum alloy can improve strength, hardness, heat resistance and cutting performance, and can also improve casting fluidity; however, too high Cu content will affect the corrosion resistance and plasticity of aluminum alloy and increase the tendency of hot cracking. Therefore, the range of Cu content in the present invention is controlled to be 0.002-0.012%.

[0040] 2. The ultra-wide 5052 aluminum alloy strip casting and rolling process design

[0041] Pre-casting refining, in the pre-casting holding furnace, the refining temperature is 720-750℃, the refining time is 30-60min; during this period, online grain refinement is performed. Due to the high activity of Ti element, Ti oxide is easily generated at the high temperature of aluminum melt. This type of oxide has a large surface energy and has a strong adsorption effect on other oxides in the melt, such as Fe2O3. Ti oxide is loose and floats to form surface slag during the refining process, which is easy to remove. By controlling the amount of Ti refining agent added, the composition is controlled, impurities are removed, and the melt is purified. Add 0.005-0.01% Ti according to the total weight ratio of the melt in the smelting furnace.

[0042] Due to the high hardness of 5052 plates, defects such as edge cracks are prone to occur even when rolling above the recrystallization temperature, especially edge quality problems are more likely to occur during the rolling of ultra-wide plates. In order to improve the yield rate and ensure stable rolling, at least one vertical roller is used before rough rolling and cutting the head and tail, and the rolling amount of each pass is 12 to 20 mm; in order to ensure that the pinch rollers have the function of correcting and centering to ensure that the aluminum alloy intermediate billet does not deviate and ensure smooth production, in addition to reducing the width, the vertical roller rolling has the functions of ensuring the edge quality of the plate and preventing edge cracks.

[0043] In order to ensure the stable rolling of ultra-wide plates, it is necessary to distinguish from the ordinary rolling process and adopt large reduction rolling to quickly change the casting structure such as coarse grains and dendrites; large deformation above the recrystallization temperature can provide sufficient recrystallization driving energy to make the rolling structure smaller; further, rough rolling with large reduction can weld casting defects such as small shrinkage holes and looseness to obtain a uniform organizational structure, thereby ensuring that the total rough rolling reduction rate is 92% to 96%.

[0044] Preferably, in order to ensure the temperature of the intermediate billet after rough rolling and avoid the influence of excessive temperature drop of the intermediate billet on the finishing rolling, the rough rolling speed is controlled to 2.4-3.6 m / s; the temperature of the intermediate billet is controlled to 460-490°C.

[0045] In addition, due to the wide rolled plate, the rolling mill is prone to slipping and difficulty in biting when biting. In order to ensure the stability of the biting process, the rough rolling biting speed is set to 1.3-2.3m / s, which should not be too fast. After stable biting, the rough rolling speed is 2.4-3.6m / s to improve production efficiency and ensure that the plate temperature does not drop too much. At the end of rough rolling, the intermediate billet is obtained. Due to the central taper of the aluminum plate transport roller, in order to prevent the ultra-wide plate from being too thin during the roller transportation, the intermediate billet is prone to gravity "collapse" due to the weight of the material itself. The thickness of the intermediate billet is designed to be 32-38mm, which should not be too thin. Too thick is not conducive to finishing rolling.

[0046] Preferably, the finishing rolling adopts a three-stand production line. In order to prevent material accumulation between the finishing stands and improve the rolling efficiency, the rolling speed should be increased in steps. Therefore, the F1 rolling speed is set to 1.5-3m / s, the F2 rolling speed is set to 2-4m / s, and the F3 rolling speed is set to 3-5m / s; further, in order to achieve rolling thinning and ensure stable rolling of ultra-wide plates, the F1 reduction rate is set to 46-49%, the F2 reduction rate is set to 44-46%, and the F3 reduction rate is set to 42-43%.

[0047] The coiling temperature is 320-340℃. If the coiling temperature is too high, it is easy to cause sticking and scratching. If the coiling temperature is too low, it is difficult to coil. In addition, since the temperature of the lower coil is high, the coiling friction will cause scratches on the surface of the sheet. Therefore, the coiling tension should not be too large. Set the tension to 12-15 / N / mm. 2.

[0048] Compared with the prior art, the advantages of the present invention are:

[0049] Chinese patent CN107142399 discloses "a process for preparing aluminum alloy and ultra-wide aluminum alloy sheet", which mainly involves 6061-T651 aluminum alloy, whose width only reaches 1300mm, and does not involve the rolling of 2550mm ultra-wide aluminum alloy.

[0050] Chinese patent CN101935786A discloses "a stabilization treatment method for 5052 aluminum alloy", A. Rolling: select aluminum alloy coils or plates and perform hot rolling or / and cold rolling to a thickness of 1.0-3.0 mm; B. Intermediate annealing: perform intermediate annealing of the aluminum alloy coils or plates after rolling at a temperature of 520-580°C for 10-15 hours; C. Cold rolling: perform cold rolling of the aluminum alloy coils or plates after intermediate annealing at a cold deformation rate of 20%-50% to obtain a 5052 aluminum alloy material with stable performance. The present invention is obviously different from the patent, as the patent method does not involve measures such as ultra-wide rolling and melt refining.

[0051] The present invention aims to achieve stable rolling of ultra-wide 5052 aluminum alloy of more than 2500 mm without equipment modification and without major changes in material composition and structure.

[0052] Specifically, by adding Ti powder as a refining agent during the refining process, the high temperature resistance of the alloy can be improved and overburning during the casting process can be avoided; adding a small amount of Ti in the alloy will form fine phases such as Al3Ti, forming a large number of fine and heterogeneous nuclei inside the alloy, hindering the movement of grain boundary dislocations and slowing down the growth rate of alloy crystals, thereby achieving the purpose of alloy grain refinement. At the same time, it can control the segregation of ingots and improve the surface quality of ingots, which has a positive effect on the basic mechanical properties and surface quality of ultra-wide 5052 plates, and reducing the shrinkage cavities and shrinkage inside the ingots.

[0053] The hot rolling process is adjusted through process parameter adjustment, the overall rough rolling reduction rate is 92% to 96%, and the multi-pass and high rolling speed idea is adopted to reduce the single-pass reduction, and finally ensure the edge and surface quality of the intermediate billet; at the same time, the high rolling speed reduces the temperature loss in the rolling process and ensures the stable finishing rolling; in order to ensure the edge quality of ultra-wide coils above 2500mm, at least one vertical roller is used in the rough rolling process, and the rolling amount is controlled at 12 to 20mm depending on the edge of the plate to ensure that the plate does not crack; due to the large weight of the ultra-wide plate itself, the intermediate billet for rough rolling should not be too thin, and the thickness of the intermediate billet should be kept at 32 to 38mm to prevent the occurrence of waist collapse and prevent subsequent rolling;

[0054] The finishing rolling is designed with a large reduction, and the total reduction rate is 81% to 85%, which further breaks the grains, obtains the rolling structure, and enhances the material performance; the large reduction can provide sufficient recrystallization deformation energy for the 5052 plate, and at the same time, by increasing the finishing rolling speed, the coiling temperature after finishing rolling is ensured to be maintained at 320 to 340°C to achieve recrystallization of the coil and stabilize the mechanical performance of the coil. After the implementation of the whole process of the present invention, the stable rolling of ultra-wide 5052 aluminum alloy can be achieved. DETAILED DESCRIPTION

[0055] The present invention is further described below in conjunction with embodiments, but this is not a limitation of the present invention. Those skilled in the art can make modifications or improvements based on the basic idea of ​​the invention, but as long as they do not deviate from the basic idea of ​​the present invention, they are all within the scope of the present invention.

[0056] The chemical composition of the melt ingredients in the embodiment of the present invention is shown in Table 1, and the remainder of the ingredients is Al and other inevitable impurities.

[0057] The casting process parameters of the embodiment of the present invention are shown in Table 2, the amount of refining agent added is calculated based on the total weight ratio of the melt in the smelting furnace, the ingot casting and pre-rolling heating parameters are shown in Table 3, and the hot rolling rough rolling and finishing rolling process parameters are shown in Table 4.

[0058] In summary, the present invention controls the melting and casting process to obtain an ingot with uniform structure and less segregation, laying a good organizational foundation for hot rolling. The hot rolling process crushes the grains and welds the casting defects by rough rolling with large reduction. The use of vertical rollers combined with the increase of rolling speed can ensure the plate shape and edge quality during the rolling process. The entire rolling process has the characteristics of low cost, low energy consumption and high production efficiency.

[0059]

[0060]

[0061]

[0062]

Claims

1. A casting and rolling process for ultra-wide 5052 aluminum alloy strip, characterized in that: The steps include: 1) Smelting The chemical composition is smelted according to the following chemical composition weight percentage: Si: 0.03-0.09%, Mg: 2.2-2.8%, Fe: 0.3-0.8%, Mn: 0.1-0.5%, Cu: 0.002-0.012%, and the rest is Al and other unavoidable impurities; and the content of a single impurity is ≤0.05%, and the total impurity content is ≤0.15%; 2) Casting Pre-casting refining, refining temperature 720 ~ 750 ℃, during which online grain refinement, adding grain refiner Ti powder, adding Ti 0.005 ~ 0.01% according to the total weight ratio of the melt in the smelting furnace; casting temperature is 700 ~ 720 ℃, the ingot rough size width is at least 2500mm, thickness is 650 ~ 670mm, and the length is based on production requirements; 3) Ingot heating Heating temperature 460~490℃, heating time 3~5h; 4) Rough rolling Use at least one vertical roller before rough rolling and trimming, and the edge rolling amount for each pass is 12 to 20 mm; The total reduction rate of rough rolling is 92% to 96%, and the intermediate billet is obtained. The thickness of the intermediate billet is 32 to 38 mm and the minimum width is 2500 mm. 5) Finish rolling The finishing rolling temperature is controlled at 460-490°C, and the finishing rolling reduction rate is 81%-85%; 6) Coiling Coiling temperature 320~340℃.

2. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip according to claim 1 is characterized in that: Step 2) During the casting process, the water flow rate of the casting crystallizer is 130-170m 3 / h.

3. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip according to claim 1 or 2, characterized in that: In step 2), after online degassing, a tubular filter box is used to filter impurities.

4. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip as claimed in claim 1, 2 or 3, characterized in that: In step 2), refining before casting: in a pre-casting holding furnace, refining time: 30 to 60 minutes.

5. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip as claimed in claim 1, 2, 3 or 4, characterized in that: In step 2), the casting speed is 50-65 mm / min.

6. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip according to claim 1 is characterized in that: In step 3), the heating temperature is 475-485°C.

7. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip as claimed in claim 1 or 5, characterized in that: In step 3), the ingot is heated to temperature and then kept warm for 1 to 3 hours.

8. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip according to claim 1, characterized in that: Step 4) The rough rolling is performed in 19 or 21 passes, the rough rolling bite speed is 1.3-2.3 m / s, and the rough rolling speed is 2.4-3.6 m / s.

9. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip according to claim 1, characterized in that: Step 5) Finish rolling adopts a three-stand production line, with F1 rolling speed of 1.5-3m / s, F2 rolling speed of 2-4m / s, and F3 rolling speed of 3-5m / s; F1 reduction rate of 46-49%, F2 reduction rate of 44-46%, and F3 reduction rate of 42-43%.

10. The casting and rolling process of the ultra-wide 5052 aluminum alloy strip according to claim 1, characterized in that: Step 6) Winding tension 12~15 / N / mm 2 .

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