超低碳钢新型连铸保护渣的开发

采用BN替代碳质材料 ,作为连铸保护渣的骨架粒子 ,研究开发出一种新型的超低碳钢连铸保护渣·新型连铸保护渣在绝热保温性能、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·新型连铸保护渣 ,可以彻底解决超低碳钢结晶器内钢液增碳和铸坯表面渗碳问题 ,而且不会发生超低碳钢结晶器内钢液增硼和铸坯表面渗硼问题·新型骨架粒子BN可以使连铸保护渣JRBW增大、熔化速度降低、粘度减小、Al2 O3 吸收速率增大、熔化温度降低、凝固温度降低、结晶温度降低

Development of New Mold Powder in Continuous Casting of Ultra-Low Carbon Steel

A new mold powder was developed in continuous casting production. Being skeleton particles in the mold powder,carbon particles were replaced by BN particles. The new mold powder was similar to the conventional mold powder in thermal insulation, melting characteristics,viscous characteristics,inclusion absorption ability and crystallization property. New mold powder can solve the problem of surface carbonization and carbon pick-up of the mold for ULC steel. The new powder has no problems of surface boronization of the mold and boron pick-up for ULC steel. BN particles can increase JRBW and Al 2O 3 absorption rate,and can decrease melting rate,viscosity,melting temperature,and solidification temperature,crystallization temperature of the mold powder.