A smelting method for reducing the clogging probability of high aluminum steel nozzle

Abstract

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. The smelting method includes: loading molten steel scrap into a converter; converter blowing process: in the converter blowing process, the carbon content at the end of the converter is controlled according to 0.01%-0.07%, and the oxygen activity at the end of the converter is controlled according to 400-1000ppm Control; RH deep decarburization treatment: In the RH deep decarburization treatment process, the reserved oxygen activity before deoxidation is between 300-1000ppm; continuous casting process; tapping and slag dumping. Because the present invention improves the clogging phenomenon of the high-alumina steel nozzle by controlling the oxygen activity of the converter blowing process, it does not need to modify the ladle slag, saves costs, and does not need to add inclusions such as calcium or rare earths to the molten steel to modify it. Quality agent, on the one hand, saves cost, on the other hand, it avoids the aggravation of nodulation at the nozzle caused by the mismatch between the amount of inclusion modifier and the composition of molten steel, and the effect of this process 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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