Sliding sprue tile for smelting high-oxygen steel and calcium treated steel

Abstract

The invention relates to a sliding nozzle brick for high-oxygen steel and calcium-treated steel. The refractory material consists of 90-100% of one or both of the refractory materials of magnesia and aluminum-magnesium spinel in terms of weight percentage , and the balance is a refractory material of zirconia or titania. The sliding nozzle brick provided by the invention is a refractory material containing more than 90% of magnesia and aluminum-magnesium spinel, which has good mechanical properties at high temperature, high chemical stability, corrosion resistance, and strong resistance to molten metal and oxidation , for high-oxygen steel and calcium-treated steel, the sliding nozzle brick has a long life, and has the advantages of light weight and low price.

Description

(1) Technical field: [0001] The invention relates to a sliding nozzle brick, in particular to a sliding nozzle brick for high-oxygen steel and calcium-treated steel. (two) background technology: [0002] The sliding nozzle bricks currently used mainly include Al 2 o 3 -C (such as Japanese Patent Application Hei 11-36012), MgO-C and ZrO 2 -C and other carbon-containing refractory materials and aluminum oxynitride (such as China CN85109111A) materials. For high-oxygen steel, the total oxygen and FeO in the steel are high, so carbon-containing refractory materials and oxynitride aluminum materials are not competent. It will cause oxidation and lead to loose materials, which is an important reason affecting its longevity. Therefore Limits the application of carbonaceous materials and aluminum oxynitride; Al 2 o 3 Zirconia and zirconia materials are also poor refractory materials against FeO attack. For calcium-treated steel with 20-40ppm free [Ca] in the steel, materials c...

AI Technical Summary

Problems solved by technology

For high-oxygen steel, the total oxygen and FeO in the steel are high, so carbon-containing refractory materials and oxynitride aluminum materials are not competent. It will cause oxidation and lead to loose materials, which is an important reason affecting its longevity. Therefore Limits the application of carbonaceous materials and aluminum oxynitride; Al 2 o 3 materials and zirconia materials are also poor refractory materials against FeO attack

For calcium-treated steel with 20-40ppm free [Ca] in the steel, materials containing alumina, silica, and mullite are not competent, and it will cause serious damage due to the formation of low-melting materials, which limits the application of this type of material. Application: Although zirconia materials meet the requirements of calcium-treated steel, there are problems of heavy weight and high price