Continuous casting nozzle inner wall coating

Abstract

The invention belongs to the technical field of continuous-casting functional refractory materials, and provides a continuous casting nozzle inner wall coating. The continuous casting nozzle inner wall coating is prepared from, by mass, 20%-40% of Bonite of which the particle size is larger than 0 mm and smaller than or equal to 1 mm, 40%-60% of a light porous material of which the particle size is larger than 0 mm and smaller than or equal to 1 mm, 5%-20% of alpha-Al2O3 of which the particle size is 325 meshes, 5%-20% of silica of which the particle size is 80 meshes, 5%-15% of a binding agent, 1%-5% of a thickening agent of which the particle size is 325 meshes and water, wherein the adding amount of the water accounts for 50%-100% of the total weight of the raw materials. A lining prepared from the coating has the lower size density and the reasonable pore structure, therefore, the heat conductivity of the lining is lower, the heat-insulating property is more excellent, the problem of matrix damage caused by mismatch of the thermal and mechanical properties does not exist, and the better social benefit and economic benefit are achieved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting functional refractory materials, and mainly relates to a coating for the inner wall of a continuous casting nozzle. Background technique [0002] The three major parts of continuous casting are important refractory materials for continuous casting, among which long nozzles and submerged nozzles (long nozzles and submerged nozzles are collectively referred to as continuous casting nozzles) are undoubtedly important functions for controlling the flow of molten steel, and their excellent thermal shock resistance It is one of its necessary main properties. Its thermal shock resistance can be guaranteed by increasing the carbon content or structural composite technology. A layer of low thermal conductivity lining material is compounded on the inner wall of the continuous casting nozzle to alleviate the thermal shock of the molten steel on the outer wall, and the outer wall usually plays the ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor thermal insulation performance brought by the lining composite process in the prior art and the limited improvement of the thermal shock resistance of the submerged nozzle, the tight combination of the lining and the outer wall may easily lead to mismatching of the thermomechanical properties of the composite layer. Problem, the purpose of this invention is to propose a continuous casting nozzle inner wall coating