40 t钢包双透气砖底搅拌物理模拟研究与应用  

Physical modeling research and application on double argon blowing of 40 t ladle

作　　者：周同军[1] ZHOU Tongjun(Baosteel Special Steel Co., Ltd., Shanghai 200940, Chin)

机构地区：[1]宝钢特钢有限公司,上海200940

出　　处：《宝钢技术》2018年第1期28-33,共6页Baosteel Technology

摘　　要：以40 t双透气砖钢包为原型,基于相似原理建立模型与原型尺寸比为1∶2的钢包底吹氩物理模拟系统,研究吹气流量、双透气砖位置对钢包混匀时间的影响规律,以便提升钢包搅拌效率。研究表明,双透气砖最佳吹气位置为0.70R-0.70R(R为钢包半径),当双透气砖支路吹气流量相等时,钢包混匀时间随双透气砖与包底中心距离的增加而缩短,随吹气流量的增大而逐渐减少;当模型吹气量超过56 L/min(原型吹气量达到112 L/min)后,混匀时间随吹气量的增加并未减少,反而有所增加;当吹气总流量相等但双透气砖支路流量不同时,支路流量比为1∶3的混匀时间比支路流量比为1∶1的混匀时间长。工业试验表明,通过优化脱氧制度、改进底搅拌工艺以及采用氩气保护浇注等技术,可降低轴承钢氧含量,其中轴承钢氧的质量分数为7×10^(-4)%以下炉数占比达60%以上,氧的质量分数10×10^(-4)%以下炉数占比达100%,提升了夹杂物控制水平和产品品质。Based on the similarity theory,a 1：2 physical modeling system has been established for 40 t ladle with double argon blowing bricks,and the relationship between the ladle mixing uniform time and blowing flow rate,different double argon blowing bricks ＇ position has been discussed,in order to improve the ladle ＇s argon blowing efficiency. Studies show that the best position of double argon bricks is 0. 7 R-0. 7 R（ R is the ladle radius）,and when the double agron bricks＇ s flow is the same,the ladle mixing time decreases as the argon blowing brick distance increases and it decreases as the argon blowing flow increases in a reasonable range,but the mixing time increases as the model flow beyond 56 L/min（ corresponding 40 t ladle blowing rate 112 L/min）. The mixing time with 1：3 branch flow is longer than that with 1：1 branch flow as the double agron bricks ＇ flow is different. Industries experiments show that optimizing deoxidation system,improving ladle blowing process,and using argon protection technology during ingot casting can decrease the oxygen content and improve the level of inclusion controlling and product quality,in which the percentage of oxygen content ≤ 7 × 10^-4% and ≤ 10 × 10^-4% are more than 60% and100% respectively.

关 键 词：物理模拟 钢包 混匀时间 氧含量 

分 类 号：TF769.2[冶金工程—钢铁冶金]