A scour-resistant carbon-free long-life submerged nozzle and its preparation process

Abstract

The invention discloses an erosion-resistant carbon-free long-lifetime immersion type water gap, which is manufactured by adopting the following raw materials in parts by weight: 46 to 48 parts of corundum, 23 to 25 parts of electric fused zirconia mullite, 9 to 11 parts of electric fused light-roasted alumina, 3 to 5 parts of silicon carbide, 2 to 4 parts of silicon metal powder, 0.6 to 1.4 parts of carbon black and 10 to 12 parts of white corundum. The erosion-resistant carbon-free long-lifetime immersion type water gap disclosed by the invention is continuously cast in a furnace for 8 times, so problem of steel slab recarburization is reduced, the carbon content is less than 0.003 percent, the standard requirement of steel product quality is met and smooth conduction of continuous casting production is guaranteed; and the erosion-resistant carbon-free long-lifetime immersion type water gap is particularly suitable for smelting non-oriented silicon steel which is silicon iron soft magnetic alloy steel with low carbon content, and mainly achieves the effects of improving the resistance of a steel plate, reducing iron losses and decreasing magnetocrystalline anisotropy.

Description

technical field [0001] The invention belongs to the technical field of high-temperature functional ceramic materials for metallurgy, and particularly relates to an erosion-resistant carbon-free long-life submerged nozzle for smelting non-oriented silicon steel and a preparation process thereof. Background technique [0002] With the continuous improvement of smelting technology and the requirements of production and life, the quality index of functional refractory submerged nozzles is getting higher and higher in actual production. When pouring, the submerged nozzle is required to be resistant to erosion and corrosion, so as to prevent impurities such as carbon oxides, aluminum oxide, and silicon dioxide in the nozzle from polluting the purity of the molten steel, thereby affecting the quality and service life of the steel. In the long-term production and use process, there are three prominent problems that often appear: 1. Due to the low porosity of the product, the high de...

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Problems solved by technology

In the long-term production and use process, there are three prominent problems that often appear: 1. Due to the low porosity of the product, the high density and poor thermal shock resistance, the product will burst during the baking process before use in the steel factory; 2. Influenced by baking conditions, the gas supply is unstable, and the baking flame is sometimes large and sometimes small, which cannot meet the nozzle baking conditions and bursts; 3. In use, especially during the first steel pouring process of the first furnace If there is a large temperature contrast, the quality of the product is slightly poor or the nozzle is not baked well, it will burst or break, and a slight burst will cause the molten steel to leak from the wall of the nozzle, causing dangerous accidents