Engineering process for producing low-iron low-silicon 3004 alloy by directly cast-rolling electrolytic aluminium liquid

Abstract

The invention relates to an engineering process for producing a low-iron low-silicon 3004 alloy by directly cast-rolling electrolytic aluminium liquid. The process comprises the procedures of alloy aluminium melting, ingredient adjusting, on-line refining for three times, standing, outgassing, grain refining, filtering, tilting cast-rolling, homogenizing, cold rolling, intermediate annealing, another cold rolling, full annealing, recoiling and packaging. The refining comprises powder spraying refining in a melting furnace and combined refining of on-line argon and carbon tetrachloride introducing. The annealing comprises high-temperature quick annealing, the intermediate annealing and the full annealing. During the cast-rolling, the temperature in a front box is 710-720 DEG C, and the cast-rolling speed is 600-900 mm / min. The product is the low-iron low-silicon 3004 alloy. The low-iron low-silicon 3004 alloy comprises 0.06-0.14 wt% of Si, 0.25-0.43 wt% of Fe, 0.012-0.14 wt% of Cu, 1.0-1.2 wt% of Mn, 0.8-1.0 wt% of Mg, at most 0.02 wt% of Zn, 0.015-0.03 wt% of Ti and the balance of Al. The invention has the characteristics of simple procedure, energy saving, emission reduction, goodalloy performance and low earring rate.

Description

technical field [0001] The invention belongs to the technical field of aluminum processing, and in particular relates to a new process for producing 3004 alloy by direct casting and rolling of electrolytic aluminum liquid. Background technique [0002] 3004 alloy is an aluminum alloy that is not strengthened by heat treatment. It combines the advantages of Al-Mn binary alloys and Al-Mg binary alloys, and has aging softening phenomenon. At present, the technology of producing 3004 alloy by hot rolling billet supply is very mature. The method of (Dc) casting is mostly used at home and abroad to produce ingots first, then hot rolling and heat treatment, and finally made into cans. The hot rolling process is: aluminum ingot remelting → ingot casting → sawing → homogenization → face milling → hot rolling → cold rolling → partial annealing → mild cold rolling → complete annealing → cold rolling → packaging. 3004H produced by hot rolling 19 The extra-thin plate has good mechanica...

AI Technical Summary

Problems solved by technology

If considering the waste products produced in the ingot casting process and the hot rolling process, the comprehensive yield is only 80%, so it has the disadvantages of large investment, many processes, and high operating costs.

[0003] 3004 aluminum alloy is mainly used for pop-top cans. The casting and rolling method is rarely used in the existing technology. Because of the uniqueness of the casting and rolling process, it is difficult to meet the mechanical properties of the casting and rolling materials such as tensile strength, elongation, and lug rate. The production requirements of deep drawing parts, there are technical problems such as easy cracking during deep drawing

[0009] Although the above-mentioned patents all involve the production process of 3004 alloy, US4517034, US4526625 and their patents of the same family GB2123319 disclose a continuous casting process, US3930895 discloses a cold casting process, and US5714019 discloses a cast-rolling method, but not electrolytic aluminum Liquid direct casting and rolling production process; CN200810123258.5 adopts conventional casting and rolling, adds conventional annealing process, and does not involve high temperature rapid annealing; and JP150283 discloses the direct continuous casting and rolling process of horizontal twin rolls, but does not consider casting and rolling The relationship between the gravity and stress of the molten aluminum during the process leads to uneven crystallization of the upper and lower parts of the alloy billet, which affects the subsequent cold rolling process

At the same time, the shortcomings of all the above-mentioned patents are that the purification rate of the aluminum alloy is low, and the impurity content is too high, which directly affects the microstructure and stamping performance of the alloy, and a large number of problems such as cracked edges and high ear-making rate occur during the deep drawing process of the tank body. , so that the production process cannot be carried out stably, resulting in low efficiency and cost waste

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