Smelting method for decreasing blockage probability of high-aluminum molten steel gap

Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a smelting method for decreasing the blockage probability of a high-aluminum molten steel gap. The smelting method comprises the steps that scrap molten iron and steel is loaded into a converter; a converter blowing process is conducted, specifically, in the converter blowing process, the carbon content at the end point of the converter is controlled to be 0.01%-0.07%, and the oxygen activity at the end point of the converter is controlled to be 400-1000 ppm; RH deep decarbonization treatment is conducted, specifically, in an RH deep decarbonization treatment process, the oxygen activity before deoxidation is reserved to be 300-1000 ppm; a continuous casting process is conducted; and tapping and slag pouring are conducted. According to the smelting method, the phenomenon of blockage of the high-aluminum molten steel gap is avoided by controlling the oxygen activity of the converter blowing process, ladle slag does not need to be modified, the cost is saved, inclusion modifiers such as calcium modifiers or rare earth modifiers do not need to be added into the molten steel, thus on the one hand, the cost is saved, on the other hand, the situation that molten steel gap nodulation is aggravated due to mismatching of the dosage of the inclusion modifiers and molten steel compositions is avoided, and the process effect is more stable.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a smelting method for reducing the clogging probability of a high-aluminum steel nozzle. Background technique [0002] During the smelting process of high-alumina steel, due to its high aluminum content, it is easy to react with oxygen to form alumina inclusions. Without special and effective treatment, it is easy to cause nodulation and blockage at the nozzle, resulting in poor casting quality. , In serious cases, continuous pouring cannot be performed, affecting normal production. [0003] The existing solutions are basically to add inclusion modifiers such as calcium or rare earth to the molten steel. On the one hand, the smelting cost is increased, and on the other hand, the nozzle is often blocked due to the mismatch between the amount of the inclusion modifier and the composition of the molten steel. Aggravated, the process effect is very unstable. Content...

AI Technical Summary

Problems solved by technology

[0002] During the smelting process of high-alumina steel, due to its high aluminum content, it is easy to react with oxygen to form alumina inclusions. Without special and effective treatment, it is easy to cause nodulation and blockage at the nozzle, resulting in poor quality of the billet In severe cases, continuous pouring cannot be performed, affecting normal production

[0003] The existing solutions are basically to add inclusion modifiers such as calcium or rare earth to the molten steel. On the one hand, the smelting cost is increased, and on the other hand, the nozzle is often blocked due to the mismatch between the amount of the inclusion modifier and the composition of the molten steel. Aggravated, the process effect is very unstable

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