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采用BN替代碳质材料,研究BN对IF钢连铸保护渣理化性能的影响,在此基础上设计开发出IF钢新型连铸保护渣。新型连铸保护渣在熔化特性、粘性特征、夹杂物吸收能力和结晶性能等方面与传统连铸保护渣十分接近。新型骨架粒子BN可以使连铸保护渣熔化温度、熔化速度、粘度和结晶温度减小、Al2O3吸收速率增大。采用新型连铸保护渣可以彻底解决IF钢的结晶器内增碳问题,不会发生IF钢增硼问题,而在非稳态浇注条件下可能发生增硼反应。
The effect of BN on the physical and chemical properties of IF continuous casting powder was studied by using BN instead of carbonaceous material. Based on this, the new continuous casting powder for IF steel was designed and developed. The new continuous casting mold fluxes are very close to the traditional continuous casting mold fluxes in terms of melting characteristics, viscous characteristics, inclusion absorption capacity and crystallinity. The new skeleton particles BN can make continuous casting mold flux melting temperature, melting speed, viscosity and crystallization temperature decreases, Al2O3 absorption rate increases. Adopting a new type of continuous casting powder can completely solve the problem of carbon in the mold of IF steel, and it does not occur the problem of adding boron in IF steel. Boron-adding reaction may occur under the condition of unsteady pouring.