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Aluminum alloy and preparation method thereof

A technology of aluminum alloy and alloy plate, which is applied in the field of alloy, can solve the problems of unfavorable alloy, insufficient strength, strength and dent resistance that cannot meet the requirements of body panels, etc.

Inactive Publication Date: 2013-08-14
ZHEJIANG GKO ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the 5XXX series aluminum alloys used for automobile body panels belong to non-heat-treatable strengthening alloys, and their strength is slightly insufficient and their impact resistance is poor; the 5XXX series aluminum alloys produced in the prior art not only cannot meet the requirements of body panels in terms of strength and dent resistance , and a series of new steps or jagged deformation bands on the surface of the product are usually produced during the deep drawing process, which seriously affects the surface quality and softens after baking, which makes it unfavorable to be used as an alloy for automobile body panels

Method used

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  • Aluminum alloy and preparation method thereof
  • Aluminum alloy and preparation method thereof

Examples

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preparation example Construction

[0055] The invention provides a method for preparing an aluminum alloy, comprising the following steps:

[0056] Melting and casting the components of the aluminum alloy described in the above technical solution to obtain an ingot;

[0057] Homogenizing, hot rolling and cold rolling the ingot;

[0058] Heating the cold-rolled alloy plate to 420°C to 530°C for 5 minutes and performing continuous annealing, the heating rate is not less than 5°C / s;

[0059] Cooling the alloy plate after continuous annealing to below 150°C, and then performing a leveling treatment, the cooling rate is not less than 10°C / s;

[0060] Heating the leveled alloy plate to 200°C to 300°C, curling it into a roll, and obtaining an aluminum alloy plate for automobile body after cooling.

[0061] The present invention melts and casts the components of the aluminum alloy described in the above technical solution to obtain an ingot. The present invention has no special limitation on the melting and casting ...

Embodiment 1

[0073] According to the aluminum alloy composition shown in Table 1, each raw material slab was heated to 480 ° C with the furnace and kept for 16 hours for conventional homogenization treatment. After the ingot is cut and face milled, it is reheated to 440°C and then hot-rolled, and the final hot-rolled thickness is 7mm. The hot-rolled plate is cold-rolled to 1.0mm, passed through a continuous annealing furnace, the cold-rolled plate is kept at 470°C for 1min, and then cooled by water quenching. After annealing and cooling, the plate is leveled, and then the obtained plate is heated to 250°C through a continuous annealing furnace, curled into a roll, and slowly cooled to obtain an aluminum alloy product for automobile body panels.

[0074] The present invention carries out tensile test on the aluminum alloy finished product that obtains at room temperature, obtains the stress-strain curve of aluminum alloy finished product, the result is as follows figure 1 as shown, figure...

Embodiment 2～4

[0079] According to the technical solution of Example 1, the components of Examples 2-4 listed in Table 1 were prepared to obtain finished aluminum alloys.

[0080] In the present invention, the obtained aluminum alloy is tested for mechanical properties and formability, and the results are shown in Table 2. Table 2 is the performance test results of the aluminum alloys obtained in the embodiments of the present invention and comparative examples;

[0081] The present invention carries out simulated baking paint test with the aluminum alloy finished product that obtains, and concrete process is as follows:

[0082] The sample is pre-stretched by 2%, then heated at 170° C. for 20 minutes, taken out, and subjected to a tensile test at room temperature after air-cooling. The results are shown in Table 2. Table 2 shows the performance of the aluminum alloys obtained in the embodiments of the present invention and comparative examples Test Results.

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Abstract

The invention provides aluminum alloy, which comprises the following components: 4.0-6.0wt% of Mg, 0.20-0.50wt% of Cu, 0.05-0.30wt% of Mn, 0.05-0.30wt% of Fe, 0.03-0.15wt% of Si, less than or equal to 0.10wt% of Cr, less than or equal to 0.10wt% of Zn, 0.01-0.10wt% of Ti and balance of Al and inevitable impurities. In the aluminum alloy, the Mg not only guarantees the strength of the aluminum, but also meets the requirements on plasticity and corrosion resistance when the aluminum alloy is used for making automobile body plates; and the Cu can further improve the strength of the prepared aluminum alloy and can enable the aluminum alloy to have better baking softening resistance and forming performance. Therefore, the aluminum alloy provided by the invention has good baking performance and forming performance.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum alloy and a preparation method thereof. Background technique [0002] The world's auto industry is facing three increasingly severe issues: energy, environmental protection, and safety. Reducing the weight of automobiles, reducing energy consumption, reducing environmental pollution, improving fuel economy of automobiles, and saving limited resources have become the focus of major automobile factories. [0003] Aluminum alloy has a series of excellent characteristics such as high specific strength, good corrosion resistance, good impact resistance, easy surface coloring, good processing formability, and high recycling and regeneration, making it an excellent choice for lightweight automobiles. The preferred material, with excellent properties unmatched by other alloys. [0004] Since the car body accounts for about 30% of the total vehicle weight, aluminum alloy is o...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22F1/047
Inventor 朱其柱丁荣辉茅海波齐基张超
Owner ZHEJIANG GKO ALUMINUM
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