铝耗及终脱氧氧位对IF钢水口结瘤的影响  

Effect of aluminum consumption and oxygen potential at final deoxidation on nozzle clogging of IF steel

作　　者：李翔[1] 包燕平[1] 王敏[1] 林路[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《工程科学学报》2015年第6期700-705,共6页Chinese Journal of Engineering

基　　金：中国博士后科学基金资助项目(2014M560890)

摘　　要：通过对IF钢水口结瘤物各层成分及形貌的分析,得出造成水口结瘤的主要原因是Al2O3夹杂物在水口内壁不断聚集和烧结.比较了不同铝耗对塞棒杆位的影响,铝耗较高时,塞棒杆位明显上涨,当铝耗超过3.5 kg·t-1时,可能导致钢水断浇等生产事故.对平均铝耗及平均终脱氧氧位作了定义,随着平均铝耗的增加,单支下水口浇铸时间呈下降趋势,当平均铝耗超过3.5 kg·t-1时,单支下水口浇铸时间低于50 min.铝耗随终脱氧氧位提高呈增加趋势,当终脱氧氧位在600×10-6以上时,铝耗可能超过3.0 kg·t-1;而平均终脱氧氧位超过600×10-6时,单支下水口浇铸时间可能低于50 min.By analyzing the composition and morphology of each layer IF steel clogs on the nozzle, it is found that aggregation and sintering of Al2O3 inclusions is the main reason for nozzle clogging. The effects of different aluminum consumptions on the stopper pole position were compared. When the quantity of aluminum consumption is large, the stopper pole position rises significantly. It may cause the casting accident of molten steel breakout while the quantity of aluminum consumption is more than 3.5 kg. t-1. The average aluminum consumption and average oxygen potential at final deoxidation were defined. As the average aluminum consumption increa- ses, the casting time decreases when a single submerged nozzle is used. When the quantity of average aluminum consumption is over 3.5 kg·t - 1, the casting time is less than 50 rain with a single submerged nozzle used. The aluminum consumption tends to increase with the improvement of oxygen potential at final deoxidation. When the oxygen potential at final deoxidation is more than 600× 10^ -6, the aluminum consumption may exceed 3.0 kg. t-1. While the average oxygen potential at final deoxidation is more than 600 × 10^-6, the casting time with a single submerged nozzle is probably less than 50 min.

关 键 词：浇铸 水口 结瘤 影响因素 氧化铝夹杂物 

分 类 号：TF775[冶金工程—钢铁冶金]