E355S含硫钢水口堵塞分析和工艺改善  

Analysis of Nozzle Plugging of E355S Sulfur Bearing Steel and Process Improvement

作　　者：陈镱 彭其春[1] 李建立[1] 刘合萍[2] 彭自胜[2] 肖鸿光[2] Chen Yi;Peng Qichun;Li Jianli;Liu Heping;Peng Zisheng;Xiao Hongguang(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081;Technology Center,Hengyang Hualing Steel Tube(Group)Co Ltd,Hengyang 421001)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081 [2]衡阳华菱钢管有限公司技术中心,衡阳421001

出　　处：《特殊钢》2020年第1期43-47,共5页Special Steel

摘　　要：针对钢厂生产含硫钢(0.10%~0.21%C,0.010%~0.050%S)出现的水口堵塞问题,利用SEM和EDS对各关键工艺流程钢样和水口堵塞样进行全面分析,结果表明:各流程钢样中粒径小于10μm的夹杂物均占94%以上,单位面积夹杂物个数随工艺流程的进行呈先降低后增加的趋势。夹杂物类型主要有CaS、CaO-MgO、MnS、MgO-Al2O3、Al2O3、CaO-Al2O3、CaO、CaO-MgO-Al2O3复合夹杂物等;水口堵塞物主要由FeO、Al2O3、MgO·Al203、CaO·Al203、CaO·2Al203组成。通过电弧炉出钢前向钢液喷吹一定量的焦炭粉,控制精炼渣中(FeO)≤1.50%、碱度2.0~4.0以及采取合适的钙处理和分阶段吹氩操作,需控制喂硫线速度在50~150 m/min;清扫中间包以及使用含硫钢专用保护渣等措施,减少了水口堵塞,控制硫化物级别≤3,减少钢液二次氧化和避免连铸事故。For the problem of nozzle blockage in the production of sulfur-containing steel(0.10%~0.21%C,0.010%~0.050%S)in a steel plant,a comprehensive analysis of the steel samples and nozzle plugging samples of each key process has been carried out by SEM and EDS.The results show that the inclusions with particle size less than 10μm in each process steel are more than 94%,the number of inclusions per unit area decreases first and then increases with the process flow.The types of inclusions are mainly CaS,CaO-MgO,MnS,MgO-Al2O3,Al2 O3,CaO-Al2 O3,CaO,CaOMgO-Al2O3 composite inclusions;the nozzle plug is mainly composed of FeO,Al2O3,MgO·Al203,CaO·Al2 O3,CaO·2 Al2O3.With blowing a certain amount of coke powder to the molten steel before EAF the tapping;controlling the refined slag(FeO)≤1.50%,basicity 2.0~4.0 and taking appropriate calcium treatment and staged argon blowing operation;to control the feeding speed of the sulphur wire in the range of 50~150 m/min;and cleaning the tundish and using special slag for sulfur-containing steel etc process measures,the nozzle blockage decreases,the sulfide rating is≤3,the secondary oxidation of liquid reduces,and the casting accident is avoided.

关 键 词：SEM EDS 水口堵塞 改善措施 

分 类 号：TF777[冶金工程—钢铁冶金]