A356.2 cast aluminum alloy and its pre-furnace adding titanium method

Abstract

The invention discloses A356.2 casting aluminum alloy and a method for adding titanium into a pre-furnace for the A356.2 casting aluminum alloy. The method comprises the steps of 1, preheating a titanium agent; 2, heating A356.2 electrolytic raw molten aluminum to the temperature not lower than 840 DEG C; 3, pumping the A356.2 electrolytic raw molten aluminum obtained in step 2 into the pre-furnace through a siphon, and meanwhile, supplying the titanium agent obtained after preheating of step 1 into the pre-furnace so that titanium-added molten aluminum can be obtained; and 4, smelting the titanium-added molten aluminum so that the A356.2 casting aluminum alloy can be obtained. Compared with the traditional A356.2 casting aluminum alloy smelting operation titanium agent adding process, bymeans of the method, the temperature raising process implemented before the titanium agent is added is omitted; the phenomenon that the titanium agent is not molten completely, so that the titanium agent sinks to the bottom is reduced; fluctuation of the titanium element is reduced; and the casting yield of the titanium agent is increased by 10%, and energy and time are saved.

Description

technical field [0001] The invention belongs to the field of aluminum alloy preparation, specifically, the invention relates to A356.2 cast aluminum alloy and a method for adding titanium in a pre-furnace. Background technique [0002] Titanium is a commonly used additive element in A356.2 cast aluminum alloy, and it is added in the form of Al-Ti or Al-Ti-B master alloy. Titanium and aluminum form TiAl 2 phase, which becomes the non-spontaneous core during crystallization, and plays a role in refining the cast structure and weld structure. In production practice, the titanium agent is added into the furnace in the form of titanium agent. Since the titanium agent needs to be fully melted at a relatively high temperature, it is necessary to ensure that the titanium agent is fully melted and has a high yield when the temperature in the furnace reaches above 820°C. Rate. Usually, after the electrolytic aluminum liquid is completely poured into the smelting furnace, it is nece...

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Problems solved by technology

Usually, after the electrolytic aluminum liquid is completely poured into the smelting furnace, it is necessary to heat up the furnace, and when the temperature reaches above 820°C, the titanium agent is then put into the furnace. This addition method has the following disadvantages: (1) Before adding the titanium agent, it needs to consume a lot of energy to heat up the molten aluminum in the furnace, which increases the cost; (2) the heating process prolongs the production time and reduces the efficiency; (3) after the titanium agent is added into the furnace, it needs to be fully stirred. Ensure uniform melting of the titanium agent and increase the labor load; (4) When the temperature is not enough and the stirring is insufficient, the unmelted titanium agent is easy to sink to the bottom. When the next batch of A356.2 cast aluminum alloy is produced, if the melting If the temperature is higher than the upper limit, the titanium agent that sinks to the bottom will melt, causing the titanium content of the furnace to increase, and resulting in large fluctuations in the titanium element in multiple batches of A356.2 cast aluminum alloy products; (5) The titanium agent is actually received The rate is low, and the cost of titanium agent is high, resulting in an increase in product cost

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