A method of processing 3105 aluminum alloy sheet

Abstract

This invention provides a processing method for 3105 aluminum alloy sheet, belonging to the field of aluminum alloy processing technology. The processing method for 3105 aluminum alloy sheet of this invention includes steps such as batching, smelting, refining, casting, rolling, quenching, annealing, and cold rolling. This invention uses a casting-rolling process instead of a hot rolling process, shortening the production and processing time of 3105 rust-resistant aluminum alloy and reducing the processing cost of 3105 aluminum alloy sheet. Simultaneously, this invention employs a double quenching treatment, effectively eliminating residual stress and significantly improving the strength and hardness of the aluminum alloy, enabling the sheet produced from the casting-rolled billet to achieve the performance standards of the hot-rolled billet, thus meeting application requirements.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy processing technology, and in particular to a processing method for 3105 aluminum alloy sheet. Background Technology

[0002] 3105 aluminum alloy belongs to the Al-Mn-Mg series of aluminum alloys. It has high strength, good plasticity, and corrosion resistance, making it a widely used general-purpose alloy. Manganese and magnesium are the main alloying elements in 3105 aluminum alloy. Manganese is prone to crystal segregation and can significantly increase the recrystallization temperature. The manganese content is generally controlled between 0.3% and 0.8%. Magnesium can improve the strength of the alloy and refine the recrystallized structure, but it will reduce the surface gloss of the annealed product. The magnesium content is generally controlled between 0.2% and 0.8%. This alloy has high strength and good corrosion resistance, and is widely used in roofing, wall cladding, and other construction projects, as well as interior decoration. It can also be combined with various coating processes to make the building appearance more colorful and corrosion-resistant.

[0003] 3105 aluminum alloy has good elongation, corrosion resistance and good processing performance. It can be smelted and processed into alloy materials of different hardness according to different application requirements.

[0004] Chinese patent CN115383067A discloses a production process for 3105 aluminum alloy coated sheet and strip substrate for architectural decoration. The process involves steps such as furnace cleaning, batching, loading, ladle turning, melting and slag removal, primary refining and slag removal and composition adjustment, composition adjustment, secondary refining and slag removal, furnace turning, refining and slag removal in a holding furnace, modification treatment, online rotary degassing, online filtration, front box liquid level control, continuous casting and rolling of the substrate, cold rolling, rewinding, edge trimming, and packaging to produce a 3105 aluminum alloy sheet. However, the above method requires multiple refining and slag removal processes, making the process complex. Therefore, there is a need to provide a processing method for 3105 aluminum alloy sheets that further simplifies the manufacturing process and reduces production costs. Summary of the Invention

[0005] In view of this, the present invention provides a processing method for 3105 aluminum alloy sheet, which simplifies the processing steps and reduces costs by adjusting the order of each step and the parameters of heat treatment.

[0006] The processing method of the 3105 aluminum alloy sheet of the present invention includes the following steps:

[0007] (1) The raw materials are batched and smelted at a temperature of 760-800℃, and then refined to obtain molten aluminum; the molten aluminum comprises the following elements by weight percentage:

[0008] Si≤0.6wt%, Fe≤0.7wt%, Mn 0.3~0.8wt%, Cr≤0.2wt%, Cu≤0.3wt%, Ti≤0.1wt%, Zn≤0.4wt%, Mg 0.2~0.8wt%, other single ≤0.05wt%, other total ≤0.15wt%, balance is aluminum;

[0009] (2) The aluminum liquid is continuously cast at a pouring temperature of 710-735℃ to obtain a cast-rolled coil with a thickness of 5.5-10.5mm;

[0010] (3) Cool the cast-rolled coil to room temperature and then perform cold rolling to obtain a cold-rolled coil with a thickness of 2.5-5.5 mm;

[0011] (4) The cold-rolled coil is subjected to quenching treatment; the quenching includes a first quenching and a second quenching;

[0012] (5) After quenching, the cold-rolled coil is kept at 350-400℃ for 1-3 hours for annealing.

[0013] (6) Cool the annealed cold-rolled coil to room temperature and then perform cold rolling to obtain the 3105 aluminum alloy sheet.

[0014] Preferably, the refining temperature in step (1) is 765-770°C.

[0015] Preferably, after refining in step (1), the process further includes steps of adjusting composition, degassing and slag removal, and removing alkali metals, so as to ensure accurate element content.

[0016] Preferably, the first quenching in step (4) involves heating the cold-rolled coil to 550-600°C, holding it at that temperature for 5-8 hours, and then quenching it. The second quenching involves straightening the cold-rolled coil after the first quenching, then heating it to 500-550°C, holding it at that temperature for 3-4 hours, and then quenching it.

[0017] Preferably, the cold rolling in step (6) is performed in multiple passes, with each pass having a deformation of more than 20%.

[0018] Preferably, the thickness of the 3105 aluminum alloy sheet in step (6) is 0.5 to 3 mm.

[0019] Compared with existing technologies, the present invention has the following advantages: The present invention provides a processing method for 3105 aluminum alloy sheet, using a casting-rolling process instead of a hot-rolling process, shortening the production and processing time of 3105 rust-proof aluminum alloy and reducing the processing cost of 3105 aluminum alloy sheet. Furthermore, the present invention employs a double quenching treatment to eliminate residual stress, improve the strength and hardness of the aluminum alloy, and enable the sheet produced from the casting-rolled billet to achieve the performance standards of the hot-rolled billet, meeting application requirements. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments.

[0021] Example 1

[0022] A processing method for 3105 aluminum alloy sheet, comprising the following steps:

[0023] (1) The above raw materials are smelted at a controlled temperature of 760-800℃, then refined at 765℃, and the composition is adjusted, degassing, slag removal, and alkali metal removal are performed to obtain aluminum liquid with accurate elemental content; the composition of the aluminum liquid is shown in Table 1:

[0024] (2) The aluminum liquid is continuously cast at a pouring temperature of 715°C to obtain a cast-rolled coil with a thickness of 6 mm.

[0025] (3) Cool the cast-rolled coil to room temperature and then cold roll it to obtain a cold-rolled coil with a thickness of 3.2 mm;

[0026] (4) The cold-rolled coil is subjected to quenching treatment; the quenching includes a first quenching and a second quenching; the first quenching is to heat the cold-rolled coil to 550°C, hold it for 6 hours and then quench it; the second quenching is to straighten the cold-rolled coil after the first quenching, then heat it to 520°C, hold it for 3 hours and then quench it.

[0027] (5) After quenching, the cold-rolled coil is kept at 360°C for 2 hours for annealing.

[0028] (6) Cool the annealed cold-rolled coil to room temperature and then perform cold rolling to obtain a 3105 aluminum alloy sheet with a thickness of 1.2 mm. The cold rolling is performed in multiple passes, and the deformation of each pass is greater than 20%.

[0029] Example 2

[0030] A processing method for 3105 aluminum alloy sheet, comprising the following steps:

[0031] (1) The above raw materials are smelted at a controlled temperature of 760-800℃, then refined at 766℃, and the composition is adjusted, degassing, slag removal, and alkali metal removal are performed to obtain aluminum liquid with accurate elemental content; the composition of the aluminum liquid is shown in Table 1:

[0032] (2) The aluminum liquid is continuously cast at a pouring temperature of 710°C to obtain a cast-rolled coil with a thickness of 7.5 mm;

[0033] (3) Cool the cast-rolled coil to room temperature and then cold roll it to obtain a cold-rolled coil with a thickness of 3.5 mm;

[0034] (4) The cold-rolled coil is subjected to quenching treatment; the quenching includes a first quenching and a second quenching; the first quenching is to heat the cold-rolled coil to 600°C, hold it for 7 hours and then quench it; the second quenching is to straighten the cold-rolled coil after the first quenching, then heat it to 510°C, hold it for 4 hours and then quench it.

[0035] (5) After quenching, the cold-rolled coil is kept at 360°C for 2 hours for annealing.

[0036] (6) Cool the annealed cold-rolled coil to room temperature and then perform cold rolling to obtain a 3105 aluminum alloy sheet with a thickness of 1.3 mm. The cold rolling is performed by multiple passes, and the deformation of each pass is greater than 20%.

[0037] Example 3

[0038] A processing method for 3105 aluminum alloy sheet, comprising the following steps:

[0039] (1) The above raw materials are smelted at a controlled temperature of 770℃, and then refined at 770℃, with steps including adjusting the composition, degassing, removing slag, and removing alkali metals, to obtain aluminum liquid with accurate elemental content; the composition of the aluminum liquid is shown in Table 1:

[0040] (2) The aluminum liquid is continuously cast at a pouring temperature of 720°C to obtain a cast-rolled coil with a thickness of 8.5 mm;

[0041] (3) Cool the cast-rolled coil to room temperature and then cold roll it to obtain a cold-rolled coil with a thickness of 3.5 mm;

[0042] (4) The cold-rolled coil is subjected to quenching treatment; the quenching includes a first quenching and a second quenching; the first quenching is to heat the cold-rolled coil to 580°C, hold it for 7 hours and then quench it; the second quenching is to straighten the cold-rolled coil after the first quenching, then heat it to 500°C, hold it for 4 hours and then quench it.

[0043] (5) After quenching, the cold-rolled coil is kept at 360°C for 3 hours for annealing.

[0044] (6) Cool the annealed cold-rolled coil to room temperature and then perform cold rolling to obtain a 3105 aluminum alloy sheet with a thickness of 1.5 mm. The cold rolling is performed by multiple passes, and the deformation of each pass is greater than 20%.

[0045] Example 4

[0046] A processing method for 3105 aluminum alloy sheet, comprising the following steps:

[0047] (1) The above raw materials are smelted at a controlled temperature of 760-800℃, then refined at 768℃, and the composition is adjusted, degassing, slag removal, and alkali metal removal are performed to obtain aluminum liquid with accurate elemental content; the composition of the aluminum liquid is shown in Table 1:

[0048] (2) The aluminum liquid is continuously cast at a pouring temperature of 725°C to obtain a cast-rolled coil with a thickness of 10.3 mm;

[0049] (3) Cool the cast-rolled coil to room temperature and then cold roll it to obtain a cold-rolled coil with a thickness of 5.5 mm;

[0050] (4) The cold-rolled coil is subjected to quenching treatment; the quenching includes a first quenching and a second quenching; the first quenching is to heat the cold-rolled coil to 580°C, hold it for 6 hours and then quench it; the second quenching is to straighten the cold-rolled coil after the first quenching, then heat it to 510°C, hold it for 4 hours and then quench it.

[0051] (5) After quenching, the cold-rolled coil is kept at 375°C for 2 hours for annealing.

[0052] (6) Cool the annealed cold-rolled coil to room temperature and then perform cold rolling to obtain a 3105 aluminum alloy sheet with a thickness of 2.5 mm. The cold rolling is performed in multiple passes, and the deformation of each pass is greater than 20%.

[0053] Table 1

[0054]

[0055] The performance of the 3105 aluminum alloy sheets prepared in Examples 1-3 was tested, and the results are shown in Table 2:

[0056] Table 2

[0057]

[0058] As can be seen from Tables 1 and 2, the 3105 aluminum alloy sheet prepared by this invention meets the requirements of GB / T38802-2012 standard in terms of tensile strength and specified non-proportional elongation strength. This invention simplifies the preparation process of 3105 aluminum alloy sheet, reduces the preparation cost, and maintains the good performance of 3105 aluminum alloy sheet.

[0059] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for processing 3105 aluminum alloy sheet, characterized in that, Includes the following steps: (1) The raw materials are batched and smelted at a temperature of 760~800℃, and then refined to obtain molten aluminum; the molten aluminum contains the following elements by weight percentage: Si≤0.6wt%, Fe≤0.7wt%, Mn 0.3~0.8wt%, Cr≤0.2wt%, Cu≤0.3wt%, Ti≤0.1wt%, Zn≤0.4wt%, Mg 0.2~0.8wt%, other single ≤0.05wt%, other total ≤0.15wt%, balance is aluminum; (2) The aluminum liquid is continuously cast at a pouring temperature of 710~735℃ to obtain a cast-rolled coil; (3) Cool the cast-rolled coil to room temperature and then perform cold rolling to obtain a cold-rolled coil with a thickness of 2.5-5.5 mm; (4) The cold-rolled coil is subjected to quenching treatment; the quenching includes a first quenching and a second quenching; (5) After quenching, the cold-rolled coil is kept at 350~400℃ for 1~3 hours for annealing treatment; (6) Cool the annealed cold-rolled coil to room temperature and then perform cold rolling to obtain the 3105 aluminum alloy sheet; The first quenching in step (4) involves heating the cold-rolled coil to 550~600℃, holding it at that temperature for 5~8 hours, and then quenching it. The second quenching involves straightening the cold-rolled coil after the first quenching, then heating it to 500~550℃, holding it at that temperature for 3~4 hours, and then quenching it.

2. The processing method of 3105 aluminum alloy sheet according to claim 1, characterized in that, The refining process in step (1) is carried out at a temperature of 765~770℃.

3. The processing method for 3105 aluminum alloy sheet according to claim 1, characterized in that, Step (1) after refining also includes steps of adjusting composition, degassing and slag removal, and removing alkali metals, so as to ensure accurate element content.

4. The processing method of 3105 aluminum alloy sheet according to claim 1, characterized in that, The cold rolling in step (6) is performed in multiple passes, with each pass having a deformation of more than 20%.

5. The processing method of 3105 aluminum alloy sheet according to claim 1, characterized in that, The thickness of the 3105 aluminum alloy sheet in step (6) is 0.5~3mm.

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