Water gap lining layer material for continuous casting

Abstract

The invention discloses a water gap lining layer material for continuous casting. The material is prepared from the following components in percent by weight: 20-60 percent of corundum, 0-30 percent of electrofusion zirconium mullite, 0-40 percent of fused silica, 3-40 percent of ceramic hollow sphere, 1-10 percent of light burning alumina, 2-6 percent of sintering assistant, 2-6 percent of phosphate bonding agent and 4-8 percent of solid phenolic resin bonding agent. A water gap for continuous casting produced by adopting the material is suitable for cold casting, and a lining basically has no nodule blocking phenomenon; the lining has high strength and does not have phenomena of chambering and abnormal erosion; a water gap has long service life; and the continuous casting production efficiency is improved.

Description

Technical field: [0001] The invention relates to an inorganic non-metallic refractory material, in particular to an inner liner material of continuous casting nozzles such as submerged nozzles, long nozzles, lower nozzles and upper nozzles used in continuous casting steel production. Background technique: [0002] In the continuous casting process, in order to protect pouring and prevent secondary oxidation of molten steel, carbon-containing nozzles are mainly used at home and abroad, mostly aluminum-carbon, aluminum-carbon-zirconium and aluminum-carbon-magnesium submerged nozzles, long nozzles and other open nozzles. , the binder is mainly phenolic resin carbon bonded system. It is a known fact that during the steel casting process, this carbon-containing refractory material will decarburize and cause deposits on the inner wall of the nozzle (Al 2 o 3 Clusters) accumulate and block the nozzle, especially the submerged nozzle, the nodulation and blockage of the upper nozzl...

AI Technical Summary

Problems solved by technology

[0004] 1. Magnesium-aluminum spinel (60-90wt%) is used to make carbon-free and silicon-free lining, but 3-6% graphite is still introduced to improve the formability. When casting steel with high oxygen content, due to oxygen and Graphite reaction in the lining material, the lining material will cause loose structure and not resistant to erosion and erosion, and the service life is short

[0005] 2. The lining is composed of zircon, silicon nitride and alumina, and ZrO is obtained after high-temperature sintering 2 The particles are evenly distributed in the Sialon matrix to resist deposition, but its ability to resist erosion and molten steel erosion is poor

[0006] 3. The inner lining is made of aluminum zirconium-magnesium aron series materials, and the newer magnesium aron high-grade refractory raw materials are introduced. The biggest problem with the use of silicon nitride, sialon or aron materials is that the low temperature strength is not high. And the working atmosphere is demanding

[0007] 4. Form a loose carbon-free layer on the inner wall of the nozzle, and then dip-coat a carbon-free slurry to densify the carbon-free layer. The main defect of this scheme is that the carbon-free layer is relatively loose, and the time for resisting molten steel erosion is relatively short, and it is resistant to immersion. The coating process has strict requirements