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Aluminum alloy plate with high natural aging stability and high baking hardening performance

An aluminum alloy sheet and natural aging technology, which is applied in the field of sheet and its manufacturing, can solve the problems of low cost, affecting appearance, undisclosed effect of natural aging stability of aluminum alloy for automobile body panels, etc., to improve strength and reduce free space Concentration, the effect of promoting the age hardening process

Inactive Publication Date: 2018-06-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The 5000-series aluminum alloy is non-heat-treatable and strengthened aluminum alloy, and its cost is lower than that of the 6000-series aluminum alloy. However, because it is easy to produce Stretcher Strain mark (that is, stretching strain mark) during drawing forming, which affects the appearance, it is mainly used for the inner plate of the cover
However, this patent document does not disclose the natural aging stability effect of the aluminum alloy for automobile body panels, and the baked yield strength of the aluminum alloy for automobile body panels is ≤ 210 MPa

Method used

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  • Aluminum alloy plate with high natural aging stability and high baking hardening performance
  • Aluminum alloy plate with high natural aging stability and high baking hardening performance
  • Aluminum alloy plate with high natural aging stability and high baking hardening performance

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Experimental program
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Effect test

Embodiment 1-8 and comparative example 1-3

[0052] The aluminum alloy plates of Examples 1-8 and Comparative Examples 1-3 were prepared by the following steps:

[0053] (1) Cast ingots by semi-continuous casting method according to the percentage distribution of each chemical element in Table 1. During semi-continuous casting, rapidly cool from liquidus temperature to solidus temperature at a cooling rate of not less than 100°C / min ;

[0054] (2) Homogenization of the ingot: Carry out two-stage homogenization: the ingot is first kept at 450-480°C for 3-8h, and then at 520°C-570°C for 3-16h. ;

[0055] (3) Hot rolling: hot rolling includes rough rolling and finish rolling, wherein the rough rolling temperature is 400-500°C, the finish rolling temperature is 220-300°C, and the total pass reduction rate of hot rolling is greater than 75%;

[0056] (4) Cold rolling: cold rolling reduction rate is 60-90%;

[0057] (5) Solution treatment and pre-aging treatment are completed on the continuous heat treatment line: the solut...

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Abstract

The invention discloses an aluminum alloy plate with high natural aging stability and high baking hardening performance. The aluminum alloy plate is prepared from, by mass percent, 0.4% to 1.0% of Mg,0.7% to 1.5% of Si, 0.02% to 0.3% of Ge, 0.2% to 0.5% of Mn+Cr, 0.01% to 0.15% of Ti, not larger than 0.5% of Fe, not larger than 0.2% of Zn and the balance Al and other inevitable impurities. Accordingly, the invention further discloses a manufacturing method of the aluminum alloy plate. The natural aging stability of the aluminum alloy plate is enhanced by reasonably optimizing the alloy ingredients of the aluminum alloy plate, the separation rate of the beta phase in the baking process is increased, and therefore the baking hardening performance of a material and the strength of a final part are improved. In addition, the aluminum alloy plate has good ductility.

Description

technical field [0001] The invention relates to a plate and a manufacturing method thereof, in particular to an aluminum alloy plate and a manufacturing method thereof. Background technique [0002] Faced with the pressure of saving energy and reducing environmental pollution, major automakers are increasingly paying attention to the lightweight of automotive materials. Due to its low density, high specific strength, and excellent corrosion resistance, formability and impact energy absorption, aluminum alloy has become the material of choice for lightweight vehicles. Therefore, the application of aluminum alloy sheets in covering parts such as automobile hoods, trunk lids and car doors is becoming more and more common. [0003] At present, automotive aluminum sheets mainly include 5000 series and 6000 series. The 5000-series aluminum alloy is non-heat-treatable and strengthened aluminum alloy, and its cost is lower than that of the 6000-series aluminum alloy. However, beca...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C21/08C22F1/043C22F1/047
CPCC22C21/02C22C21/08C22F1/002C22F1/043C22F1/047
Inventor 苑锡妮刁可山曾渝李言波徐世伟石磊蒋浩民
Owner BAOSHAN IRON & STEEL CO LTD
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