Abstract: 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 10 fim 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, Al₂O₃, CaO~Al₂O₃, CaO, CaO- MgO-Al₂O₃composite inclusions; the nozzle plug is mainly composed of FeO, Al₂O₃ , MgO • A1₂O₃ , CaO • Al₂0₃, CaO • 2Al₂O₃. With blowing a certain amount of coke powder to the molten steel before EAF the tapping ； controlling the refined slag (FeO) ≤l.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.

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。