High-strength 6xxx-series aluminum alloy plate for automobile body and preparation method of high-strength 6xxx-series aluminum alloy plate

A technology for aluminum alloy sheets and automobile bodies, applied in the field of aluminum alloy materials, can solve the problems of insignificant effects, unfavorable sheet stamping forming, high yield strength, and achieve the effects of high surface quality, elimination of paint brush lines, and excellent hemming performance.

Inactive Publication Date: 2021-01-08
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in terms of how to improve the bake hardening performance of alloys, patents CN201010199924.0, CN201410283404.6, CN201410064892.1 etc. achieve high paint hardening effects by adding alloy elements such as Cu and Zn to conventional 6xxx series aluminum alloys; patent CN200810194841.5 , CN200710190078.4 and patent CN201711217322.1, by controlling the preheating process after solid solution water quenching of the plate, the bake hardening performance of the plate is improved, but the effect is not obvious; in the CN201480008337.5 patent, it is mentioned that a The ratio of the total number of Mg and Si atoms in the measured atomic clusters to the total number of solute atoms in the matrix is ​​controlled at 10%-30%, so that the strength before baking and the BH response are simultaneously improved.
The specific method is to carry out the first-stage reheating treatment at 100-250°C for about 2 minutes after solution quenching, and then carry out the second-stage heating at 70-130°C for several hours. Larger improvement, but the initial yield strength is higher, which is not conducive to sheet metal stamping

Method used

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  • High-strength 6xxx-series aluminum alloy plate for automobile body and preparation method of high-strength 6xxx-series aluminum alloy plate
  • High-strength 6xxx-series aluminum alloy plate for automobile body and preparation method of high-strength 6xxx-series aluminum alloy plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The composition of the aluminum alloy is calculated by mass percentage: Si: 0.4wt.%; Mg: 0.6wt.%; Zn: 0.02wt.%; Cu: 0.15wt.%; Mn: 0.05wt.%; Fe: 0.22wt.% ; Ti: 0.01wt.%, the balance is Al and normal impurities.

[0037]The alloy is melted according to the above ratio, and the melt is refined (filtered by a 50ppi filter plate with a pore size, degassed with argon gas online, and the hydrogen content is controlled to 0.13ml / 100g Al), and then the ingot is cast by semi-continuous casting equipment; After the ingot is cut and face milled, it is homogenized. The homogenization temperature is 570°C, and it is kept for 4 hours; after that, the temperature is lowered to 520°C for hot rolling, and the rolling is to 8mm thick, and the final rolling temperature is 270°C; Roll to 5mm, then carry out intermediate annealing and cold rolling at 420°C×2h to obtain a cold-rolled sheet with a thickness of 1mm, keep the cold-rolled reduction rate of the sheet after annealing to 80% after c...

Embodiment 2

[0039] The composition of aluminum alloy is calculated by mass percentage: Si: 0.45wt.%; Mg: 0.8wt.%; Zn: 0.02wt.%; Cu: 0.05wt.%; Mn: 0.1wt.%; Fe: 0.18wt.% ; Ti: 0.02wt.%, the balance is Al and normal impurities.

[0040] The alloy is melted according to the above ratio, and the melt is refined (filtered by a 50ppi filter plate with a pore size, degassed with argon gas online, and the hydrogen content is controlled to 0.12ml / 100g Al), and then the ingot is cast by semi-continuous casting equipment; After the ingot is cut and face milled, it is homogenized. The homogenization temperature is 560°C, and the temperature is kept for 6 hours; after that, the temperature is lowered to 520°C for hot rolling, and the rolling is to 5mm thick, and the final rolling temperature is 260°C; cold rolling to 4mm , and then carry out intermediate annealing and cold rolling at 440°C for 3 hours to obtain a cold-rolled sheet with a thickness of 1mm. 550℃, holding time is 90s, then cooling, and s...

Embodiment 3

[0042] The composition of aluminum alloy is calculated by mass percentage: Si: 0.6wt.%; Mg: 0.4wt.%; Zn: 0.02wt.%; Cu: 0.25wt.%; Mn: 0.2wt.%; Fe: 0.22wt.% ; Ti: 0.03wt.%, the balance is Al and normal impurities.

[0043] The alloy is melted according to the above ratio, and after the melt is refined, the ingot is cast by semi-continuous casting equipment; the ingot is homogenized after being cut and face milled, and the homogenization temperature is 560°C, and the temperature is kept for 8 hours After that, the temperature was lowered to 510°C for hot rolling, rolling to 5mm thickness, and the final rolling temperature was 240°C; cold rolling to 3.3mm, and then 420°C×4h intermediate annealing and cold rolling to obtain a 1mm thick cold-rolled sheet, which was maintained after annealing The plate is cold-rolled to the final thickness. The cold-rolling reduction rate of the plate is 70%, and then solution treatment is performed. The solution treatment temperature is 550°C, and t...

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Abstract

The invention discloses a high-strength 6xxx-series aluminum alloy plate for an automobile body and a preparation method of the high-strength 6xxx-series aluminum alloy plate. The plate comprises thefollowing components in percentages by mass: 0.4wt.%-1.2wt.% of Si, 0.3wt.%-0.8wt.% of Mg, less than or equal to 0.3wt.% of Zn, 0.05wt.%-0.25wt.% of Cu, 0.05wt.%-0.2wt.% of Mn, less than or equal to 0.3wt.% of Fe, 0.01wt.%-0.03wt.% of Ti, and the balance of Al and impurities with the content being less than 0.05wt.%. The aluminum alloy prepared by the method has excellent mechanical properties andsurface quality, especially has high bake hardening performance, and is especially suitable for an outer plate of a covering part for the automobile body.

Description

technical field [0001] The invention relates to the field of aluminum alloy materials, in particular to a 6xxx series aluminum alloy plate for high-strength automobile body and a preparation method thereof. Background technique [0002] Automobile lightweight is not only a more economical and effective means to achieve energy saving and emission reduction, but also helps to improve safety performance and driving performance. As a good lightweight material, the application of aluminum alloy sheets in automobiles is gradually increasing. [0003] In addition to good surface quality (no paint brush line defects), flanging performance, and mechanical properties, the 6xxx series aluminum alloys used for the outer panels of automobile bodies also require high bake hardening properties. This is because the high bake hardening performance can ensure that the material rapidly rises from the low yield strength at the time of delivery to the high yield strength during the coating and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22F1/047C22C1/03C21D9/00C22F1/043C22C21/02B21C37/02
CPCB21C37/02C21D9/0081C22C1/026C22C1/03C22C21/02C22C21/08C22F1/043C22F1/047
Inventor 曹以恒赵丕植刘贞山赵经纬
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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