80t BOF-LF-RH流程GCr15钢超深脱硫的生产实践

Production Practice of Ultra Deep Desulphurization of Steel GCr15 by 80t BOF-LF-RH Process

通过实践表明,生产轴承钢时,转炉出钢温度≥1 650℃、出钢[0]≤300×10-6,18 kg/t的渣料可实现出钢过程50%的脱硫效率;同时,转炉出钢采用"挡渣锥+滑板挡渣"双挡的模式,实现将硫再降低0.000 5%;采取"铝在转炉出钢时加入+LF精炼使用硅铁粉脱氧"模式,以及控制炉渣二元碱度在5~6,可实现50%以上的脱硫效率的同时,也能够稳定浇铸性能,达到成品硫≤0.001 5%。

Through the practice show that,it can be seen the production of bearing steel,the converter tapping temperature≥1 650 ℃,tapping oxygen ≤300 ×10-6,and 18 kg/t slag can achieve 50% desulfurization efficiency in the tapping process.At the same time,the mode of "slag retaining cone+slide plate slag retaining" is adopted in converter tapping to reduce sulfur by another 0.000 5%;the mode of aluminum adding in BOF tapping+LF refining to deoxidize with ferrosilicon powder and controlling the binary basicity of slag to be 5~6 can achieve more than 50% desulfurization effect and stabilize the casting performance to get finished product sulfur conterct≤0.001 5%.