Relevance and Prospect of Refractory Materials Clean Steel Continuous Casting

Posted by refractory material on February 15th, 2017

In the production of clean steel, often use aluminum for deep deoxidation, resulting in high melting point of Al2O3, easy to remove, usually by refractory brick the shape of inclusions to purify the molten steel, the appropriate refractory material can achieve this purpose, such as refractory CaO can react with Al2O3 to produce compound compound Ca12Al14O3 with a melting point of about 1400, which can effectively remove Al2O3 inclusions in steel. At the beginning of the pouring, due to the use of refractory materials furnace refractory bricks and refractory material is molten steel melting and other reasons, may also lead to the formation of molten steel inclusions, and may cause carbon. In recent years, people have done a lot of research on the removal of inclusions in steel, such as optimizing tundish structure, using molten steel filter, slag weir, etc. to promote the floating of inclusions.
refractory material 1 and the relationship between the phosphorus in steel The phosphorus in the steel is too high, resulting in severe segregation in the solidification of the product brittle crisp and crisp, the presence of phosphorus in steel increased the low temperature brittleness of steel, the general requirements of phosphorus content of less than 0.035% , Requirements for low-temperature toughness requirements of blast furnace refractories phosphorus in the 0.005% or less. The relationship between refractory material and nitrogen in steel The effect of nitrogen on the deep drawing performance of cold-rolled steel is great, and the high content of nitrogen in steel will lead to the aging of steel. The hardness increases and the ductility decreases. Good processing performance, so the steel content of nitrogen should be as low as possible. Reduce the nitrogen content in steel First, low-nitrogen converter smelting, control the end of nitrogen, but the key is to prevent the secondary oxidation of molten steel nitrogen, slab continuous casting is concerned, the castables refractory largest amount of nitrogen occurred between the ladle and tundish The
The content of nitrogen in traditional refractory materials is very low. In recent years, the application of nitrides in refractories has attracted attention. The decomposition of nitrides such as SiAlON may cause nitrogen to the molten steel. Immersed water nozzle conventional aluminum carbon immersion into the water does not meet the clean steel, such as automotive ultra-low carbon steel, electrical steel and other production needs, there is steel by carbon, wall erosion serious, intolerant erosion and other issues. Studies have shown that the use of ordinary aluminum carbon immersion into the nozzle of ultra-low carbon steel average carbon increased by 3.810-6, while the use of carbon-free submersible pouring ultra-low carbon steel when the average carbon increased 1.110-6. For easy to cause carbon and silicon by the clean steel smelting, generally more use of composite refractories, that is, in contact with the molten steel part of the use of carbon-free and silicon-free refractory materials, and in its external use of seismic and anti-slag erosion performance Carbon and silicon containing refractories. Has developed a composite structure of the immersion nozzle, lined with non-carbon and non-silicon spinel material, tapping port composite spinel - siliceous materials, pouring ultra-low carbon high-oxygen steel, the effect is good. Spinel material does not react with MnO, FeO in steel, not only does not melt, but also forms a dense erosion-resistant layer on the working surface. The composite nozzle has been used in high manganese steel and high oxygen steel continuous casting, also applies to stainless steel, calcium treatment steel, easy cutting steel.

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