无取向硅钢薄板坯连铸液面波动和水口结瘤控制  

Mold level fluctuation and submerged entry nozzle clogging control of thin slab continuous casting for non-oriented silicon steel

作　　者：李大鹏[1,2] 薛文辉 吴华章[1] 王海风[2] 

机构地区：[1]本溪钢铁(集团)有限责任公司,辽宁本溪117021 [2]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081

出　　处：《炼钢》2017年第6期37-41,共5页Steelmaking

摘　　要：不同于鼓肚导致的亚包晶钢液面波动,针对无取向硅钢薄板坯连铸结晶器液面严重波动的问题,通过研究浸入式水口结瘤对结晶器流场的影响、分析事故时操作与液位曲线的现场数据,可推断出结晶器液面波动的主要原因是大量未去除的脱氧产物所造成的浸入式水口结瘤。本溪钢铁(集团)有限责任公司炼钢厂的生产实践表明:通过采取精准控制转炉终点钢水w(O)至800×10-6以下、RH后期软吹氩流量从150~200 L/min减小到40~50 L/min、适当提高中间包钢水过热度在25~45℃等技术措施,无取向硅钢结晶器液面的波动幅度从±15 mm以上降低至±3 mm以内。As distinguished from the level fluctuation caused by bulging for hypo-peritectic steel, aiming at serious mold level fluctuation of thin slab continuous casting for non-oriented silicon steel, by means of researching the effect of the submerged entry nozzle clogging on mold flow field and analyzing the workshop data of accident operation and level curve, it was inferred that the main cause for level fluctuation was the submerged entry nozzle clogging resulted from a great deal of deoxidation products which had not been efficiently removed. The production practice at steelmaking plant of Bensteel indicated that mold level fluctuation range during non-oriented silicon steel casting had been dropped from more than - 15 mm to less than ＋ 3 mm through some techifical measures as controlling accurately blowing end-point oxygen mass fraction of molten steel below 800×10^-6, reducing argon flow rate from 150 - 200 L/rain to 40 - 50 L/min at the later stage of RH,and raising properly superheat to 25 - 45℃ of liquid steel in tundish.

关 键 词：无取向硅钢 液面波动 浸入式水口 结瘤 

分 类 号：TF777.7[冶金工程—钢铁冶金]