Parabola type long-service-life continuous casting submersed nozzle

Abstract

The invention discloses a parabolic long-life continuous casting submersed nozzle which comprises a nozzle body, the top of the nozzle body is a bowl opening portion, the lower portion of the nozzle body is provided with a slag line portion, and the nozzle body between the bowl opening portion and the slag line portion is composed of a cylindrical body on the upper portion and a parabolic body on the lower portion. 48-52% by mass of Al203 is contained in the cylinder body and the parabola-shaped body, wear-resistant coatings are arranged on the inner circumferential walls of the cylinder body and the parabola-shaped body respectively, the wear-resistant coatings are composed of 28-32% by mass of C + SiC mixture, 45-50% by mass of magnesium oxide is contained in the bowl opening part, a wear-resistant coating is arranged on the inner circumferential wall of the bowl opening part, and the wear-resistant coatings are composed of 20-30% by mass of magnesium oxide. A wear-resistant coating is arranged on the inner circumferential wall of the slag line part, the wear-resistant coating is composed of 15-20% by mass of a C + SiC mixture, 80-82% by mass of ZrO2 is contained in the slag line part, the wear-resistant coating is arranged on the inner circumferential wall of the slag line part, and the wear-resistant coating is composed of 18-22% by mass of a C + SiC mixture.

Description

technical field [0001] The invention relates to a novel structure of a tundish submerged nozzle of a continuous casting machine of a steel-making enterprise, in particular to a parabolic long-life continuous casting submerged nozzle. Background technique [0002] The main functions of continuous casting submerged nozzles are: to prevent secondary oxidation, nitridation and splashing of molten steel; to adjust the flow state and injection speed of molten steel; The floating plays an important role; it has a decisive influence on the yield of slab continuous casting and the quality of the slab. The continuous casting submerged nozzle is a statically formed aluminum carbon protective tube, which is used for the protection pouring of the steel flow between the continuous casting tundish and the mold, which can prevent the molten steel from oxidizing and absorb oxygen and nitrogen from the surrounding air. . [0003] The use conditions and performance requirements of the immers...

AI Technical Summary

Problems solved by technology

3. During casting, the flow rate of molten steel is high, and the mechanical impact force on the convection steel mouth and bottom is large

4. The high flow rate of molten steel also intensifies the erosion and erosion of the inner wall of the submerged nozzle

5. The continuous casting mold mold powder has the characteristics of low melting point, low viscosity and high melting speed, which makes the liquid slag easily penetrate into the pores of the submerged nozzle and accelerate the internal erosion of the nozzle, and the wall of the nozzle is very thin

[0004] The main problems existing in the traditional submerged nozzle: the inner wall of the continuous casting submerged nozzle is straight up and down in the shape of a cylinder, and the slag line has poor corrosion resistance to molten steel and slag, and the inner wall of the nozzle is prone to accumulation of inclusions during the pouring process. It will lead to the blockage of the nozzle, so that the continuous casting cannot be carried out smoothly

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