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Aluminum alloy plate for automobile body and preparation method of aluminum alloy plate

A technology for aluminum alloy sheets and automobile bodies, applied in the field of aluminum alloy materials, can solve problems such as insignificant effect, unfavorable sheet metal stamping, high yield strength, etc., to improve the strength of baking paint, high bake hardening performance, and improve bake hardening performance Effect

Active Publication Date: 2020-12-18
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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  • Aluminum alloy plate for automobile body and preparation method of aluminum alloy plate
  • Aluminum alloy plate for automobile body and preparation method of aluminum alloy plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition of the aluminum alloy is calculated by mass percentage: Si: 0.8wt.%; Mg: 0.8wt.%; Zn: 0.4wt.%; Cu: 0.2wt.%; Mn: 0.1wt.%; Zr: 0.1wt.% ; Fe: ≤0.2wt.%, the balance is Al and normal impurities.

[0036]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 550°C and the temperature is kept for 10 hours. After that, the temperature is lowered to 520°C for hot rolling, and the rolling is to 6mm thick. The final rolling temperature is 260°C; three passes of cold Roll to 3.3mm, then perform intermediate annealing and cold rolling at 440°C×5h to obtain a cold-rolled sheet with a thickness of 1mm, keep the cold-rolled reduction rate of the sheet afte...

Embodiment 2

[0038] The composition of aluminum alloy is calculated by mass percentage: Si: 1.0wt.%; Mg: 0.55wt.%; Zn: 0.6wt.%; Cu: 0.3wt.%; Mn: 0.1wt.%; Zr: 0.1wt.% ; Fe: 0.18wt.%, the balance is Al and normal impurities.

[0039] 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 milled, and the homogenization temperature is 550°C, and the temperature is kept for 10 hours ; After cooling down to 500°C for hot rolling and starting rolling, rolling to 5mm thick, the final rolling temperature is 270°C; cold rolling to 1.43mm, and then 430°C×5h intermediate annealing and cold rolling to obtain a 1mm thick cold-rolled sheet, keep the annealed The plate is cold-rolled to the final thickness. The cold-rolling reduction rate of the plate is 30%, followed by solution treatment. The solution treatment temperature is 550°C, and the holding time is 90s. After that, it is...

Embodiment 3

[0041] The composition of aluminum alloy is calculated by mass percentage: Si: 1.2wt.%; Mg: 0.3wt.%; Zn: 0.8wt.%; Cu: 0.1wt.%; Mn: 0.1wt.%; Zr: 0.1wt.% ; Fe: 0.18wt.%, the balance is Al and normal impurities.

[0042] 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 milled, and the homogenization temperature is 550°C, and the temperature is kept for 10 hours ; After cooling down to 500°C, hot rolling starts rolling, rolling to 6mm thick, and final rolling temperature at 260°C; cold rolling to 4mm, and then 440°C×4h intermediate annealing and cold rolling to obtain a 1mm thick cold-rolled sheet, keep the sheet after annealing The cold rolling reduction rate of cold rolling to the final thickness of the plate is 80%, followed by solution treatment, the solution treatment temperature is 560 ° C, the holding time is 60s, and then cooled, and the stra...

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Abstract

The invention discloses an aluminum alloy plate for an automobile body and a preparation method of the aluminum alloy plate. The aluminum alloy plate comprises 0.8wt.%-1.2wt.% of Si, 0.3wt.%-0.8wt.% of Mg, 0.4wt.%-0.8wt.% of Zn, 0.1wt.%- 0.3wt.% of Cu, 0.05wt.%-0.2wt.% of Mn, smaller than or equal to 0.3wt.% of Fe, 0.05wt.%-0.15wt.% of Zr , and the balance of Al and impurities with the content lower than 0.05wt.%. The preparation method comprises the steps: casting, homogenization, hot rolling, cold rolling, intermediate annealing, solid solution, straightening, primary pre-aging and secondaryaging. The alloy has higher bake hardening performance, the baking varnish strength of the plate can be remarkably improved on the premise of guaranteeing relatively low initial yield strength of theplate, and meanwhile the edge covering performance and the surface quality of the plate can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy materials, in particular to an aluminum alloy plate for 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 automotive body outer panels 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 baking process, so as to...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22F1/043
CPCC22C21/02C22F1/002C22F1/043
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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