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High-forming baking-resistant 5xxx series aluminum alloy plate and preparation method thereof

A kind of aluminum alloy sheet material, baking-resistant technology, applied in the direction of metal rolling, process efficiency improvement, coating, etc., can solve the problems that are difficult to balance formability, baking resistance and mechanical properties, and achieve significant baking hardening Ability, improve work hardening ability, avoid softening or insufficient mechanical properties

Pending Publication Date: 2022-05-27
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a highly formable and bake-resistant 5xxx series aluminum alloy plate and its preparation method to solve the problem that the 5xxx series aluminum alloy plate in the prior art is difficult to balance formability, bake resistance and mechanical properties

Method used

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  • High-forming baking-resistant 5xxx series aluminum alloy plate and preparation method thereof
  • High-forming baking-resistant 5xxx series aluminum alloy plate and preparation method thereof
  • High-forming baking-resistant 5xxx series aluminum alloy plate and preparation method thereof

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preparation example Construction

[0039] As described in the background of the present invention, there is a problem in the prior art that 5xxx series aluminum alloys are difficult to take into account formability, baking resistance and mechanical properties. In order to solve the above problems, in a typical embodiment of the present invention, there is provided a method for preparing a 5xxx series aluminum alloy sheet with high forming and baking resistance, including the following steps: step S1, mixing raw materials of 5xxx series aluminum alloy and mixing Melting and casting the ingot to obtain an aluminum alloy ingot; wherein, by weight percentage, the aluminum alloy composition is: Mg 5.0-7.5wt.%, Cu 0.15-0.6wt.%, Si≤0.1wt.%, Fe 0.1-0.4wt% %, Mn 0.05~0.15wt.%, Cr≤0.05wt.%, Ti≤0.1wt.%, the sum of inevitable impurities≤0.15wt.%, the balance is Al; step S2, the aluminum alloy ingot is carried out Double-stage homogenization treatment. In the double-stage homogenization treatment, the temperature is first r...

Embodiment 1

[0056] The aluminum alloy composition in mass percentage is: Mg 6.0wt.%, Cu 0.3wt.%, Si 0.08wt.%, Fe0.12wt.%, Mn 0.05wt.%, Cr 0.01wt.%, Ti 0.05wt.% , and the rest are Al.

[0057] The above alloy components are cast into slabs by semi-continuous casting. The ingot is homogenized by a two-stage homogenization process. First, the temperature is raised to 440°C at 30°C / h, and kept for 2 hours, and then heated to 500°C at 30°C / h, kept for 10 hours, and then taken out for air cooling. The ingot after milling was heated to 500°C for 3 hours for hot rolling, and the final rolling temperature was 300°C. Cold-rolling and intermediate annealing are performed on the plate, and box-type annealing is used for intermediate annealing, the temperature is 280° C., and the temperature is kept for 3 hours. Then, the plate after intermediate annealing is cold-rolled, and the cold rolling reduction rate is 50%. The cold-rolled sheet is continuously annealed, the annealing temperature is 530°C, a...

Embodiment 2

[0059] The aluminum alloy composition in mass percentage is: Mg 7.1wt.%, Cu 0.15wt.%, Si 0.08wt.%, Fe0.10wt.%, Mn 0.12wt.%, Cr 0.01wt.%, Ti 0.10wt.% , and the rest are Al.

[0060] The above alloy components are cast into slabs by semi-continuous casting. The ingots were homogenized using a two-stage homogenization process. First, the temperature was raised to 440°C at 30°C / h, and kept for 4 hours, and then heated to 540°C at 25°C / h, kept for 8 hours, and then taken out for air cooling. The ingot after milling was heated to 500°C for 3 hours for hot rolling, and the final rolling temperature was 330°C. Cold rolling and intermediate annealing are carried out on the plate, and the intermediate annealing adopts box annealing, the temperature is 350° C., and the temperature is kept for 3 hours, and then the plate after intermediate annealing is cold-rolled, and the cold rolling reduction rate is 50%. The cold-rolled sheet is continuously annealed, the annealing temperature is 54...

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Abstract

The invention provides a high-forming baking-resistant 5xxx series aluminum alloy plate and a preparation method thereof. Comprising the following steps: sequentially carrying out ingot casting, two-stage homogenization treatment, hot rolling, intermediate annealing, cold rolling and final annealing on aluminum alloy raw materials comprising 5.0-7.5 wt% of Mg, 0.15-0.6 wt% of Cu, less than or equal to 0.1 wt% of Si, 0.1-0.4 wt% of Fe, 0.05-0.15 wt% of Mn, less than or equal to 0.05 wt% of Cr, less than or equal to 0.1 wt% of Ti, less than or equal to 0.15 wt% of inevitable impurities and the balance of Al, and carrying out different homogenization processes on materials with different Mn contents to obtain the high-forming baking-resistant 5xxx series aluminum alloy plate. Through adjustment of aluminum alloy components and cooperation of a preparation process, the plate has good forming performance, baking resistance and mechanical performance, YPE is 0, and the comprehensive performance is obviously superior to that of an existing 5-series high-strength aluminum alloy material.

Description

technical field [0001] The invention relates to the field of non-ferrous metals, in particular, to a high-forming and baking-resistant 5xxx series aluminum alloy sheet and a preparation method thereof. Background technique [0002] With the continuous advancement of lightweight in the automotive field, aluminum alloys have become the most ideal material for lightweight transportation due to a series of excellent characteristics such as high specific strength, good corrosion resistance, good processing performance, and extremely high recycling performance. 5xxx series aluminum alloys have good formability and high strength, and can be used to manufacture parts with complex shapes, and have great potential for application in automobiles. Compared with traditional steel, the difficulty of popularizing and applying aluminum alloy automobile sheet is that the cost of parts is much higher than that of traditional steel, the formability is not as good as that of steel plate, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C21/08B05D7/16B21B1/02B21B3/00
CPCC22C1/026C22C21/08B21B1/026B21B3/00B05D7/16B21B2001/028B21B2003/001Y02P10/20
Inventor 纪艳丽赵丕植潘琰峰任毅斌宋小雨刘贞山赵经纬
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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