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

Abstract

The refractory material for the sliding tap-hole block consists of magnesite and / or magnesia alumina spinel refractory material 90-100 % with the rest being zirconia or titanium oxide refractory material. The sliding tap-hole block of the present invention has excellent mechanical performance, chemical stability, corrosion resistance, metal burn-out resistance and oxidation resistance at high temperature, and when it is used in smelting high-oxygen steel and calcium treated steel, it has long service life, light weight and low cost.

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. (2) Background technology: [0002] The sliding nozzle bricks currently used mainly include Al 2 O 3 -C (such as Japan Special Publication No. 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 in the steel is high, and FeO is high. Therefore, carbon-containing refractories and oxynitride materials are incompetent. It will cause oxidation and lead to material looseness, which is an important reason for affecting its longevity. Limited the application of carbon-containing materials and aluminum oxynitride; Al 2 O 3 Materials and zirconia materials are also refractory materials with poor resistance to FeO corrosion. 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