Technical concept of metallurgical refractory

Refractory materials for metallurgical kilns are the key auxiliary materials supporting the production and operation of iron and steel. Magnesia carbon brick manufacturers are mainly reflected in the following points: magnesia brick

(1) As a material in contact with molten steel, abnormal damage or excessive erosion of functional refractory may cause molten steel leakage and even serious accidents. For example, steel leakage caused by excessive erosion of breathable elements, splashing of molten steel caused by abnormal fracture during the use of submerged nozzle, flow control failure caused by excessive erosion of plug rod, steel leakage caused by functional failure of side seal plate, etc.

(2) Production efficiency, refractory used in metallurgical kiln is the key link of iron and steel production, and its performance has an important impact on iron and steel production efficiency. The ventilation element and sliding plate will be replaced offline in case of damage and function failure, so as to reduce the turnover times of ladle; Submerged water table, stopper and side seal plate are one of the key control links of the number of continuous casting furnaces. Excessive erosion, scouring and abnormal fracture of materials will reduce the number of continuous casting furnaces, and then affect the production efficiency of iron and steel.

(3) The function of refractories used in metallurgical kilns is very important for billet quality. Whether they play their role or not has an important impact on billet quality.

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The stirring action of the air permeable element has an important influence on the uniformity of liquid steel composition and temperature and the promotion of alloying; Long nozzle and submerged nozzle protect molten steel from secondary oxidation. At the same time, the function of submerged nozzle to control the flow field of mold plays an important role in promoting the floating of inclusions, reducing slag entrapment and stabilizing the flow field; The silicon free and carbon free submerged nozzle with anti blocking function can not reduce the carbon and silicon increase of molten steel, but also avoid the adhesion of alumina in the nozzle and reduce the introduction of large inclusions in the billet; Magnesium carbon submerged nozzle avoids the introduction of alumina inclusion in molten steel, which is conducive to improving the quality of cord steel.

Setting reasonable turbulence controller in tundish, optimizing weir dam combination and using air curtain retaining wall to reduce dead zone can optimize liquid steel flow path, promote inclusion floating and improve billet quality; Optimize the shape of stopper head, improve the sensitivity of molten steel flow control, reduce the fluctuation of liquid level in the mold and reduce the possibility of slag entrapment; The argon channel is set at the head of the integral stopper rod, which can also reduce the adhesion of alumina and improve the quality of billet.

Therefore, the performance and service behavior of refractory materials used in metallurgical kilns have an important impact on the performance and efficiency of steel production and steel production.