Novel aluminum alloy and method for manufacturing aluminum foil with high deep-drawing performance by continuous cast-rolling

Abstract

The invention relates to the field of processing and manufacturing of metal materials and particularly relates to a novel aluminum alloy and a method for manufacturing an aluminum foil with high deep-drawing performance by continuous cast-rolling. The novel aluminum alloy contains the following components in percentage by mass: 0.1-0.3% of Si, 1.0-1.5% of Fe, 0.3-0.6% of Mn, not greater than 0.05% of Ti and the balance of Al. According to the novel aluminum alloy and the method for manufacturing the aluminum foil with high deep-drawing performance by continuous cast-rolling, which are provided by the invention, cast-rolled aluminum coils are pre-processed by increasing the content of Mn and Fe in a blank and optimizing a continuous cast-rolling process, so that defects that the aluminum foil produced by the cast-rolling blank is low in plasticity and insufficient in deep-drawing performances are overcome; the produced aluminum foil can achieve and can even exceed performances of the hot-rolled blank aluminum foil, and can solve a universality problem of the fin aluminum foil and a thinning problem of the deep-drawing aluminum foil very well.

Description

technical field [0001] The invention relates to the field of metal material processing and manufacturing, in particular to a novel aluminum alloy and a method for manufacturing high-drawability aluminum foil by continuous casting and rolling. Background technique [0002] Aluminum foil has the characteristics of light weight, beautiful appearance, easy processing, no pollution, recyclability, and excellent thermal conductivity. It is widely used in electromechanical, packaging, construction and other fields. In my country's aluminum foil consumption, aluminum foil for heat exchanger fins (hereinafter referred to as fin aluminum foil) accounts for the largest proportion, accounting for 48%, followed by the packaging field accounting for 17%. According to statistics, in 2011, the output of air conditioners in my country was as high as 139 million units, and the heat exchanger fins consumed about 480,000 tons of aluminum foil (calculated on the basis of 3.5kg of aluminum foil f...

AI Technical Summary

Problems solved by technology

[0005] (1) Fully annealed O-state and H22-state aluminum foils with high deep drawability, high flange and high flanging properties still cannot meet the needs of high-end customers;

[0006] (2) There are many kinds of alloys;

[0007] (3) The performance of ECO and CB high-speed molding methods with both high strength and high plasticity fluctuate greatly

[0018] (1) Strong crystalline texture and poor deep drawability: The continuous casting and rolling method has the characteristics of rapid solidification and directional crystallization, and the grain structure of the cast-rolled plate presents a "herringbone" directional arrangement in the longitudinal section to form a strong crystalline texture ,like figure 1 As shown, the coarse primary axis orientation arrangement is not easy to be fully broken during cold rolling, and the texture of the cold-rolled sheet is particularly strong, and the isotropic performance is uneven, so the aluminum foil punched products produced by continuous casting and rolling blanks have a high lug rate and a streamlined deformation. It is also obvious that the deep drawing performance is poor, and it is not easy to be used as a deep drawing product.

[0019] (2) High strength and low plasticity: Due to the large supersaturation of alloying elements in the continuous casting and rolling method, after the aluminum foil is rolled by the continuous casting and rolling billet, under the same state, the strength of the aluminum foil is higher than that of the aluminum foil within the comparable thickness range. Billet rolled aluminum foil with lower elongation

[0033] (3) Insufficient deep drawing performance of aluminum foil

At present, whether it is hot rolling or continuous casting and rolling, aluminum foil suppliers have not been able to solve this problem well.

[0036] (4) The challenge of the development trend of finned aluminum foil

However, the casting and rolling process also has many disadvantages: (1) The production speed is much lower than the theoretical production speed; (2) It is only suitable for alloys with a narrow solidification range, and alloys with a wide solidification range can hardly be produced, such as the 7××× series , 2××× series and some 5××× series alloys with high magnesium content, this method limits the production range of the alloy; (3) due to the limitation of the process, the deformation of the material is relatively insufficient, and the performance of the material is very poor. It is difficult to compare with materials produced by ingot metallurgy, and the products are mainly suitable for medium and low-end application markets

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