Preparation method of 5-series aluminum alloy can cover material

Abstract

The invention relates to the field of aluminum alloy preparation and processing, in particular to a preparation method of a 5-series aluminum alloy can cover material, which comprises the following steps: burdening, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening and packaging. The hot rolling comprises rough rolling and then five-rack hot continuous rolling until the hot rolling leveling thickness is 2.1-2.2 mm, and the finish rolling temperature is 315-335 DEG C; the cold rolling comprises three-rack cold continuous rolling and then single-rack rolling, and the thickness of a cold-rolled product is 0.218-0.224 mm. The preparation method is high in rolling success rate, high in rolling efficiency and stable in finished product quality.

Description

Technical Field

[0001] The invention belongs to the field of aluminum alloy preparation and processing, and specifically relates to a preparation method of 5 series aluminum alloy can cover material. Background Art

[0002] The main alloying element of 5 series aluminum alloy is magnesium, which has good processing performance, corrosion resistance, weldability and high strength, making it the preferred material for can lids.

[0003] At present, the cold rolling process of 5 series aluminum alloy can cover materials requires 5-6 passes, which has a long cycle, high cost, low efficiency, and a lot of waste, and cannot meet the needs of fierce market competition.

[0004] In summary, there is an urgent need for a preparation method for 5 series aluminum alloy can cover materials with high rolling success rate, high rolling efficiency and stable finished product quality. Summary of the invention

[0005] The invention aims to solve the technical problems of low rolling success rate, low rolling efficiency and unstable finished product quality in a preparation method of 5 series aluminum alloy can cover material.

[0006] In order to achieve the above-mentioned object, the first aspect of the present invention provides a method for preparing a 5 series aluminum alloy can cover material, wherein the preparation method comprises: batching, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening, and packaging;

[0007] The hot rolling conditions include: firstly hot rough rolling, the hot rough rolling is 21-23 passes, then five-stand hot continuous rolling is carried out until the hot rolled product thickness is 2.1-2.2mm, and the final rolling temperature is 315-335℃;

[0008] The cold rolling conditions include: first three-stand cold rolling to 0.32-0.36mm, then single-stand rolling, and the thickness of the cold-rolled product is 0.218-0.224mm.

[0009] The second aspect of the present invention provides an aluminum alloy can cover material obtained by the above preparation method.

[0010] Beneficial effects: The rolling preparation method disclosed in the present invention has high rolling success rate, high rolling efficiency and stable finished product quality. DETAILED DESCRIPTION

[0011] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0012] The existing technology for preparing 5 series aluminum alloy can cover materials requires 5-6 cold rolling passes, which has a long cycle, high cost, low efficiency and a large amount of waste.

[0013] In the present invention, the inventors found that if the hot rolling and cold rolling processes are optimized, the preparation method of 5 series aluminum alloy can cover material can have high rolling success rate, high rolling efficiency and stable finished product quality.

[0014] To this end, the first aspect of the present invention provides a method for preparing a 5 series aluminum alloy can cover material, wherein the preparation method comprises: batching, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening, and packaging;

[0015] The hot rolling conditions include: firstly hot rough rolling, the hot rough rolling is 21-23 passes, then five-stand hot continuous rolling is carried out until the hot rolled product thickness is 2.1-2.2mm, and the final rolling temperature is 315-335℃;

[0016] The cold rolling conditions include: first three-stand cold rolling to 0.32-0.36mm, then single-stand rolling, and the thickness of the cold-rolled product is 0.218-0.224mm.

[0017] In the present invention, the preparation method is optimized, the production efficiency of 5 series aluminum alloy can materials is improved, the auxiliary time of coil rolling is shortened, the amount of rolling waste in one or two passes is saved, the yield is improved, the production cost is reduced, and the metal circulation is accelerated.

[0018] Further, the alloy state of the aluminum alloy can material is 5182-H19.

[0019] According to the present invention, the cold rolling conditions also include: the processing rates of three-stand cold rolling are 55-58%, 40-42% and 36-38% respectively, and the processing rate of a single stand is 33-39%.

[0020] According to the present invention, the components and their weight percentages in the aluminum alloy can cover material are: Si content ≤0.12%, Fe content is 0.20-0.30%, Cu content is ≤0.12%, Mg content is 4.75-4.90%, Zn content is ≤0.03%, Cr content is 0.02-0.04%, Ni content is ≤0.05%, Ti content is 0.008-0.02%, Mn content is 0.35-0.45%, single impurity content is ≤0.05%, total impurity content is ≤0.15%, and the balance is Al.

[0021] According to the present invention, the smelting conditions include: the smelting temperature is 720-760°C.

[0022] According to the present invention, the refining conditions include: the refining temperature is 710-760°C.

[0023] According to the present invention, the filtration is performed by first plate-type CFF filtration and then deep bed filtration or tubular filtration.

[0024] In the present invention, the above filtering method can reduce the slag content of the melt and ensure the purity of the melt.

[0025] In the present invention, Al-5Ti-0.2B is used for online refinement treatment to ensure the grain size of the aluminum alloy ingot.

[0026] According to the present invention, the casting conditions include: the casting temperature is 665-705°C.

[0027] According to the present invention, the heating conditions include: heating time is 2-3h, and heating metal temperature is 500-520°C.

[0028] The second aspect of the present invention provides an aluminum alloy can cover material obtained by the above preparation method.

[0029] Test Method

[0030] The tensile mechanical properties (tensile strength, specified non-proportional elongation strength, elongation after fracture) are measured according to GB / T 16865.

[0031] The technical scheme of the present invention is further described in detail below in conjunction with the embodiments. Obviously, the embodiments described herein are only some embodiments of the present invention and are not intended to limit the present invention. Based on the embodiments in the present invention, all other embodiments implemented by ordinary technicians in the field without making creative improvements belong to the protection scope of the present invention.

[0032] Example 1

[0033] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.059%, Fe: 0.264%, Cu: 0.09%, Mg: 4.825%, Zn: 0.005%, Cr: 0.023%, Ni: 0.004%, Ti: 0.0016%, Mn: 0.408%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0034] Melting temperature is 745℃, refining temperature is 735℃. CFF filtration + deep bed filtration is used, and the casting temperature is 678℃. The sawing amount of the sawing head in the sawing and milling surface is 360mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 500℃, and the holding time is 2 hours. First hot rough rolling, hot rough rolling 21 times, and then hot continuous rolling in 5 stands to the finished product thickness of 2.1mm, and the final rolling temperature is 324℃. Cold rolling three continuous rolling, middle trimming, cold rolling single stand, cold rolling pass distribution and process parameters are shown in Table 1.

[0035] Table 1

[0036]

[0037] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.7% and a cleaning temperature of 65° C. The cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material A1.

[0038] Example 2

[0039] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.049%, Fe: 0.262%, Cu: 0.092%, Mg: 4.815%, Zn: 0.005%, Cr: 0.026%, Ni: 0.004%, Ti: 0.0016%, Mn: 0.416%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0040] Melting temperature is 749℃, refining temperature is 742℃. CFF filtration + deep bed filtration is used, and the casting temperature is 680℃. The sawing amount of the sawing head in the sawing and milling surface is 350mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 510℃, and the holding time is 3 hours. First hot rough rolling, hot rough rolling 21 times, and then hot continuous rolling in 5 stands to the finished product thickness of 2.15mm, and the final rolling temperature is 330℃. Cold rolling three continuous rolling, middle trimming, cold rolling single stand, cold rolling pass distribution and process parameters are shown in Table 2.

[0041] Table 2

[0042]

[0043] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.7% and a cleaning temperature of 65° C. The cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material A2.

[0044] Comparative Example 1

[0045] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.057%, Fe: 0.26%, Cu: 0.092%, Mg: 4.829%, Zn: 0.005%, Cr: 0.03%, Ni: 0.004%, Ti: 0.018%, Mn: 0.404%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0046] Melting temperature is 746℃, refining temperature is 738℃. CFF filtration + deep bed filtration is used, and the casting temperature is 678℃. The sawing amount of the ingot head in the sawing and milling surface is 365mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 500℃, and the holding time is 3 hours. First hot rough rolling, hot rough rolling 21 times, and then hot continuous rolling in 5 stands to the finished product thickness of 2.5mm, the final rolling temperature is 325℃. Six cold rolling passes, middle trimming, cold rolling single stand four passes, single stand five passes, single stand six passes, cold rolling mill pass distribution and process parameters are shown in Table 3.

[0047] Table 3

[0048]

[0049] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.7% and a cleaning temperature of 65°C; the cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material DA1.

[0050] Comparative Example 2

[0051] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.057%, Fe: 0.26%, Cu: 0.092%, Mg: 4.829%, Zn: 0.005%, Cr: 0.03%, Ni: 0.004%, Ti: 0.018%, Mn: 0.404%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0052] Melting temperature is 746℃, refining temperature is 732℃. CFF filtration + deep bed filtration is used, and the casting temperature is 682℃. The sawing amount of the ingot head in the sawing and milling surface is 365mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 500℃, and the insulation time is 3 hours. First hot rough rolling, hot rough rolling 21 times, and then hot continuous rolling in 5 stands to the finished product thickness of 2.5mm, the final rolling temperature is 327℃. Six cold rolling passes, three cold rolling, middle trimming, four cold rolling passes on a single stand, five passes on a single stand, six passes on a single stand, the cold rolling pass distribution and process parameters are shown in Table 4.

[0053] Table 4

[0054]

[0055] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.7% and a cleaning temperature of 65°C; the cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material DA2.

[0056] The performance indicators and production indicators of A1-A2 and DA1-DA2 are shown in Table 5.

[0057] Table 5

[0058]

[0059]

[0060] It can be seen from Table 5 above that the aluminum alloy can cover materials prepared in Example 1 and Example 2 have equivalent mechanical properties to those prepared in Comparative Example 1 and Comparative Example 2, and other indicators meet the requirements, the number of production passes is reduced, the efficiency is improved, and the production cost is reduced.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing 5 series aluminum alloy can cover material, characterized in that: The preparation method comprises: batching, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening and packaging; The hot rolling conditions include: firstly hot rough rolling, the hot rough rolling is 21-23 passes, then five-stand hot continuous rolling is carried out until the hot rolled product thickness is 2.1-2.2mm, and the final rolling temperature is 315-335℃; The cold rolling conditions include: first three-stand cold rolling to 0.32-0.36mm, and then single-stand preparation, the cold rolled product thickness is 0.218-0.224mm.

2. The preparation method according to claim 1, characterized in that: The cold rolling conditions also include: the processing rates of three-stand cold rolling are 55-58%, 40-42% and 36-38% respectively, and the processing rate of a single stand is 33-39%.

3. The preparation method according to claim 1, characterized in that: The components and their weight percentages in the aluminum alloy can cover material are: Si content ≤0.12%, Fe content is 0.20-0.30%, Cu content is ≤0.12%, Mg content is 4.75-4.90%, Zn content is ≤0.03%, Cr content is 0.02-0.04%, Ni content is ≤0.05%, Ti content is 0.008-0.02%, Mn content is 0.35-0.45%, single impurity content is ≤0.05%, total impurity content is ≤0.15%, and the balance is Al.

4. The preparation method according to claim 1, characterized in that: The smelting conditions include: smelting temperature is 720-760°C; The refining conditions include: the refining temperature is 710-760°C.

5. The preparation method according to claim 1, characterized in that: The filtration adopts plate type CFF filtration first, and then deep bed filtration or tubular filtration.

6. The preparation method according to claim 1, characterized in that: The casting conditions include: the casting temperature is 665-705°C.

7. The preparation method according to claim 1, characterized in that: The heating conditions include: heating time of 2-3 hours, and heating metal temperature of 500-520°C.

8. Aluminum alloy can cover material prepared by the preparation method according to any one of claims 1 to 7.

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