Method for improving castability of high-aluminum non-oriented silicon steel during thin slab continuous casting production

Abstract

The invention discloses a method for improving the castability of high-aluminum non-oriented silicon steel during thin slab continuous casting production. The method can improve the continuous casting heat number of the high-aluminum non-oriented silicon steel from 10 heats to 16 heats on the basis of ensuring smooth production and stable quality, and has obvious effects in the aspects of improving the hourly yield and reducing the production cost.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for improving the castability of high-alumina non-oriented silicon steel produced by continuous casting of thin slabs. Background technique [0002] Thin slab continuous casting and rolling production line is a short-process process. Compared with conventional processes, it has the advantages of simplicity, high efficiency, energy saving and environmental protection. However, due to the characteristics of thin slab continuous casting, the inner diameter of the tundish nozzle used in continuous casting is small, and the "specific surface area" in contact with the inner wall of the nozzle during the casting process is greatly increased. It is a major problem; while the main inclusions in aluminum-killed steel are aluminum-based inclusions. Under the condition of large "specific surface area", the probability of nodulation on the inner wall of the nozzle is greatly incr...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of thin slab continuous casting, the inner diameter of the tundish nozzle used in continuous casting is small, and the "specific surface area" in contact with the inner wall of the nozzle during the casting process is greatly increased. It is a major problem; while the main inclusions in aluminum-killed steel are aluminum-based inclusions. Under the condition of large "specific surface area", the probability of nodulation on the inner wall of the nozzle is greatly increased, and in severe cases, it can lead to production interruption; Therefore, the castability problem of aluminum killed steel is more prominent in the production process of thin slab continuous casting process

[0003] Among the Al-killed steels that have been developed by the thin slab continuous casting process, due to the characteristics of vacuum smelting of high-alumina non-oriented silicon steel, the total amount of fine inclusions in the molten steel is more than that of the conventional ladle refining process; as the casting process progresses, the inner wall of the nozzle The nodules will show a gradual increase process, and the castability will become poor, so that the number of continuous casting furnaces can not be effectively improved; in view of the castability of high-alumina non-oriented silicon steel, we try to improve the castability of high-aluminum non-oriented silicon steel by referring to the conventional aluminum-killed steel calcium treatment method , the effect is unstable, and the final product after the calcium treatment process denatures the inclusions will affect the performance and surface quality of the finished board

Images