Method for preventing rare earth steel continuous casting nozzle from being blocked

Abstract

The invention belongs to the technical field of continuous casting equipment, and particularly relates to a method for preventing a rare earth steel continuous casting nozzle from being blocked. The method comprises the following steps that 1, a stopper rod is heated at the beginning of continuous casting, and the heating temperature is kept higher than the temperature of tundish molten steel; meanwhile, a submersed nozzle is heated, and the heating temperature is kept higher than the temperature of tundish molten steel; 2, when the position of the stopper rod rises, namely, the nozzle is nodulated or blocked, the heating temperature of the stopper rod and the submersed nozzle is increased, and if the stopper rod continues rising, the heating temperature of the stopper rod and the submersed nozzle continues to be increased; and 3, after the stopper rod returns, the stopper rod and the submersed nozzle are cooled and adjusted back to the initial set temperature. According to the method,the easily-blocked parts of the nozzle and the stopper rod can be heated, the temperature of the parts is increased, the viscosity of rare earth inclusions is reduced, the fluidity of the rare earthinclusions is improved, and a good effect of improving nozzle nodulation and blockage is achieved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting equipment, and in particular relates to a method for preventing the clogging of a rare earth steel continuous casting nozzle. Background technique [0002] In the process of steel smelting, rare earth can play the role of microalloying, interaction with harmful elements, desulfurization and deoxidation, hydrogen capture, dispersion hardening and deformation inclusions. At the same time, rare earth has an important impact on the properties of steel. However, in the smelting process of rare earth-containing steel, rare earth can modify oxygen and sulfide inclusions, that is, generate rare earth oxysulfide, such as rare earth Ce in bearing steel will generate CeAlO 3 、Ce 2 o 2 S. Ce 2 o 3 、Ce 3 o 4 , the MnS inclusions in the steel will transform into rare earth sulfide composite inclusions, and the overall inclusions are spherical in shape and smaller in size. These rare earth oxid...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that nozzle nodules and clogging are prone to occur in continuous casting when producing rare earth-containing steel grades, the present invention provides a method for preventing the clogging of the rare earth steel continuous casting nozzle, and better solves the problem of the continuous casting nozzle clogging of the rare earth steel. Improve production efficiency and ensure smooth production

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