Abstract: The change of inclusions in the VOD + LF refining process of 304 stainless steel was studied. Before and after the beginning and end of the smelting process of the second VOD furnace with continuous casting and continuous casting, before and after the beginning and end of the weak agitation process of the LF furnace, mid-term tundish casting, the continuous casting billet is sampled, and the use of chemical composition analysis, metallographic observation and electron microscopy were used to detect it. It is found that the T[O] production process of 304 stainless steel gradually decreases with the process. The number of inclusions is on the rise before LF weak agitation. Then the process flow is gradually reduced. The morphology of inclusions is dominated by oxides of Cr₂O₃ and MnO before the reduction process is carried out. After the reduction process, the main silicate inclusions are found. After the weak agitation of LF refining, the inclusions changed into spherical inclusions with calcium aluminate as the main inclusions. At the same time, the formation mechanism of inclusions was analyzed and studied.

摘要： 对304不锈钢采用VOD + LF精炼工艺流程的夹杂物的变化进行研究,分别在其连铸连浇第2炉 VOD炉冶炼开始前和结束后、LF炉弱搅拌工艺开始前和结束后、中间包浇铸中期、连铸坯进行取样,并利用化学成分分析、金相观察以及电镜能谱分析进行检测。研究发现304不锈钢生产过程T[O]随流程逐渐降低;夹杂物数量 在LF弱搅拌前呈上升趋势，随后工艺流程中逐渐降低;而夹杂物形态在进行还原工艺前以Cr₂O₃、MnO的氧化物为 主,还原工艺后以硅酸盐夹杂物为主;而LF精炼弱搅拌后，夹杂物变为以钙铝酸盐球形夹杂物为主。同时对夹杂 物的产生机理进行了分析和研究。

关键词: 304不锈钢, , VOD-LF-CC工艺流程, 夹杂物