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Refractory materials for metallurgical kiln are key auxiliary materials to support efficient operation of iron and steel production, mainly reflected in the following points:
(1) Safety of production. As a material in contact with molten steel, abnormal damage or excessive erosion of functional refractory materials may cause molten steel leakage, or even cause serious safety accidents. For example, steel leakage caused by excessive erosion of breathable elements, external splashing of molten steel caused by abnormal fracture during the use of immersion water outlet, flow control failure caused by excessive erosion of plug rod, steel leakage caused by functional failure of side sealing plate, etc.
(2) Production efficiency, refractory material for metallurgical kiln is the key link of iron and steel production, its performance has an important impact on iron and steel production efficiency.
Ventilating element, slide board damage, function failure will be replaced offline, reduce ladle turnover.
Submerged water, plug rod and side seal plate are one of the key control links of the number of continuous casting furnaces. Excessive erosion, erosion and abnormal fracture of materials will reduce the number of continuous casting furnaces, and thus affect the production efficiency of iron and steel.
(3) Billet quality, the function of refractory materials used in metallurgical kiln is particularly important, its role has an important impact on the billet quality.
The stirring effect of the breathable element has an important effect on the uniform composition and temperature of the liquid steel and promoting the alloying. Long spout and immersion spout protect molten steel from secondary oxidation. Meanwhile, the function of controlling the flow field of the mold by immersion spout plays an important role in promoting the inclusions to float, reducing the slag and stabilizing the flow field.
The non-silicon and non-carbon immersion nozzle with anti-clogging function can not only reduce the carburizing and silicifying of molten steel, but also avoid the adhesion of alumina in the nozzle and reduce the introduction of large inclusions in the billet. The magnesia-carbon immersion nozzle avoids alumina inclusion in the molten steel and is beneficial to improving the quality of cord steel.
The flow path of liquid steel can be optimized by setting turbulence controller with reasonable structure, optimizing combination of weir and dam, and using air curtain retaining wall to reduce dead zone, which can promote inclusions floating up and improve billet quality.
Optimize the shape of the plug rod head, improve the sensitivity of the flow control of molten steel, reduce the fluctuation of the liquid level in the mold, and reduce the possibility of slag rolling; Argon gas channel can also reduce alumina adhesion 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 safety and efficiency of steel production, especially on the production of high-quality steel.