Automatic slag line changing system of slab caster based on molten steel temperature control

Abstract

The invention relates to an automatic slag line changing system of a slab caster based on molten steel temperature control. The system comprises a steel ladle, a tundish and a crystallizer from top to bottom, wherein a long nozzle is arranged below the steel ladle, an immersed nozzle is arranged below the tundish, and an automatic slag line control system is arranged between the tundish and the crystallizer. The automatic slag line control system controls the tundish to drive the immersed nozzle to move up and down in the crystallizer, so that the function of automatically changing the slag line is achieved, and particularly, a continuous temperature thermocouple is additionally arranged in the tundish, the automatic slag line control system is in control connection with the continuous temperature thermocouple, the molten steel temperature measured by the continuous temperature thermocouple is returned to the automatic slag line control system, and the position of the tundish is adjusted according to the current superheat degree of the molten steel so as to drive the immersed nozzle to be inserted into the molten steel of the crystallizer by a depth; and the problem of longitudinal cracks on the surface of a casting blank due to unreasonable insertion depth of the immersed nozzle into the molten steel is effectively solved, the service life of the immersed nozzle is prolonged, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an automatic slag changing line system for a slab continuous casting machine based on molten steel temperature control. By controlling the insertion depth of the submerged nozzle, the invention not only improves the service life of the submerged nozzle in the traditional automatic control method of the submerged nozzle insertion depth, but also effectively improves the casting billet quality of abnormal molten steel. Background technique [0002] In order to prevent the secondary oxidation of molten steel during continuous casting, the molten steel is generally protected from the tundish to the crystallizer by submerged nozzle + mold slag. This method greatly reduces the secondary oxidation of molten steel. However, mold slag The erosion of the submerged nozzle refractory material by the liquid slag layer and the steel slag interface has greatly shortened the se...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing automatic slag-changing line system of slab continuous casting machine does not consider the influence of the insertion depth of the submerged nozzle on the quality of the slab, and it is easy to cause longitudinal cracks on the surface of the slab or slag rolling on the liquid surface of the mold. Problem, to provide an automatic slag changing line system based on molten steel temperature control for slab continuous casting machine

Images