A method for preventing nozzle clogging of rare earth steel continuous casting

Abstract

The invention belongs to the technical field of continuous casting equipment, and specifically relates to a method for preventing the clogging of the rare earth steel continuous casting nozzle, which includes the following steps: Step 1: when the continuous casting starts, the stopper rod is heated, and the heating temperature is kept higher than that of the tundish The temperature of the molten steel; at the same time, heat the submerged nozzle to keep the heating temperature higher than the temperature of the molten steel in the tundish; Step 2: When the position of the stopper rises, that is, nodules or blockages occur at the nozzle, then increase the pressure on the stopper and the submerged nozzle. The heating temperature of the nozzle, if the stopper rod continues to rise, continue to increase the heating temperature of the stopper rod and the submerged nozzle; Step 3: After the stopper rod returns to its original position, lower the temperature of the stopper rod and the submerged nozzle to the initial setting temperature. The method can heat the nozzle and the easily blocked part of the stopper rod, increase the temperature of the part, reduce the viscosity of the rare earth inclusions, improve their fluidity, and obtain a good effect of improving nozzle nodules and blockage.

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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