Large-size hollow ingot and ingot casting method

Abstract

The invention belongs to the technical field of aluminum alloy, and particularly relates to a large-size hollow ingot and an ingot casting method. The large-size hollow cast ingot comprises the following chemical components of, in percentage by mass, less than or equal to 0.4% of Si, less than or equal to 0.4% of Fe, less than or equal to 0.1% of Cu, 0.7%-1.1% of Mn, 5.5%-6.5% of Mg, less than orequal to 0.1% of Cr, less than or equal to 0.04% of Ni, less than or equal to 0.2% of Zn, less than or equal to 0.15% of Ti, 0.001%- 0.005% of Be, 0.05%-0.15% of Zr, less than or equal to 10 ppm of Na, less than or equal to 10 ppm of Ca, and the balance Al and inevitable impurity elements, wherein the mount of Fe is larger than that of Si, and m% (Fe-Si) equal to 0.06%-0.1%. The casting method comprises the steps of compounding ingredients, smelting purification, casting and homogenizing treatment. The method is characterized in that an optimal melt purification process is determined by researching a feeding structure, a smelting temperature, a refining medium, refining gas and an operation mode; a cracking tendency defect is overcome by selecting the optimal casting temperature and casting speed; through a two-stage homogenizing treatment process, the structure uniformity is ensured, the deformation uniformity is promoted, recrystallization is inhibited, and the final performance of the alloy is improved; and an electromagnetic coil is added to achieve transformation and upgrading of a casting tool, external field assistance is provided, and large-size casting rods are easy to cast and form.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a large-size hollow ingot and an ingot casting method. Background technique [0002] With the rapid development of aerospace, nuclear power, automobile, national defense industry, high-speed rail and rail transit and other industries, the demand for high-performance aluminum alloy seamless aluminum tubes is increasing year by year. The preparation of large-scale hollow ingots is the prerequisite for the preparation of high-end large-scale high-performance aluminum alloy profiles. However, the outer diameter of the large-scale hollow ingot ( the inside diameter of ) is often difficult to cast. Defects such as cracking, layering, cold shut, compounds, and segregation tumors often occur during the casting process, resulting in too many geometric waste products, and some defects cannot be processed by machining, so that the entire furnace ingot is scrapped . ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of eccentricity, cracks, and uneven composition in large-scale hollow ingots in the prior art, the present invention provides a large-scale hollow ingot and an ingot casting method to solve the above technical problems

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