Crystallizer liquid level static state type casting method for improving quality of high-quality casting blank

Abstract

The invention discloses a crystallizer liquid level static state type casting method for improving the quality of a high-quality casting blank. The static state type casting method comprises the following steps that a tundish (1) is lifted by using a servo hydraulic cylinder, the tundish (1) performs molten steel casting by using a submersed nozzle (3), the molten steel liquid level of any crystallizer (2) is stabilized at a constant position, and the tundish and the servo hydraulic cylinder are controlled to make the depth of the submersed nozzle (3) inserted in the molten steel descend or ascend at constant speed. By adopting the method, automatic adjustment of the inserting depth of the submersed nozzle in the casting state of molten steel can be ensured, unstable state operations suchas adjustment fluctuation of the crystallizer liquid level are avoided, heat dissipation, solidification and slag film uniformizing of molten steel in a crystallizer are ensured, and the uniform distribution of surface quality of casting blanks of a continuous casting machine is achieved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgical continuous casting, and in particular relates to a static casting method on the liquid surface of a crystallizer that provides high-quality billet quality. Background technique [0002] With the advancement and rapid development of green manufacturing in the steel industry, low-cost, high-efficiency, and high-quality manufacturing have become the main research topics. At the same time, keeping up with the formation of new metallurgical technology ESP continuous casting and continuous rolling technology, it is particularly important to provide good rolling mill billets. In the long-term continuous production environment, the stability of the core parameters of the process is the best way to obtain qualified billets. The crystallizer is the core component of the solidification of molten steel in steelmaking. Due to the influence of other factors such as the life of continuous casting refr...

AI Technical Summary

Problems solved by technology

This process has more frequency of unsteady operation of molten steel during casting, solidification and crystallization, resulting in large fluctuations in mold liquid level and casting speed and disordered crystallizer flow, which increases the flow of molten steel slag or large-grained inclusions in mold bends. The probability of the lunar surface being adsorbed by the primary slab shell directly leads to surface peeling or even substandard performance of the final product during the casting slab rolling process

[0003] At the same time, the liquid level of the mold was repeatedly adjusted at the first slag line and the second slag line, and the submerged nozzle of the tundish was seriously eroded at the two positions, resulting in a short service life of the nozzle and increasing the abnormal operation of the molten steel casting process , which is not conducive to the stability of the quality of cast slabs and rolled products

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