铝镇静钢中夹杂物形态对其去除的影响  

Effect of state of inclusions on removal in Al-killed liquid steel

作　　者：邓志银 周业连 朱苗勇 

机构地区：[1]东北大学冶金学院

出　　处：《钢铁》2018年第1期34-40,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(U1560208);中央高校基本科研业务费基金资助项目(N162504002)

摘　　要：为了研究夹杂物形态对其去除的影响,采用工业试验研究分析了钢中夹杂物的种类与全氧质量分数的关系,并通过水模型试验研究了夹杂物在钢-渣界面的去除行为,讨论了固态夹杂物和液态夹杂物的去除行为差异。试验结果表明,在RH精炼前对钢液进行钙处理会严重限制RH去除夹杂物的能力,因而这种方法并不适合于对全氧要求严格的钢种;夹杂物的形态对其在钢-渣界面的分离有重要的影响,相比固态夹杂物,液态夹杂物在钢-渣界面的分离需要更长的时间,在其未彻底分离之前很有可能会被钢液流动再次带回钢中,因而更难去除。为了获得更低的全氧质量分数,在铝镇静钢的精炼过程最好能使夹杂物保持固态并且与钢液不浸润。In order to study the effect of the state of inclusions on their removal in liquid steel,industrial trials were carried out to investigate the relationship between the total oxygen content and the types of inclusions,while water modelling in laboratory was also conducted to reveal the removal behaviors at the steel-slag interface.The difference between solid and liquid inclusions removal was discussed based on the industrial and laboratory results.It is found that the calcium treatment before RH would evidently limit the capacity of RH to remove inclusions,and this method is not suitable for steel grades that requires an ultra-low total oxygen content.The state of inclusions has an obvious effect on the separation behavior of inclusion at the steel-slag interface.Compared with solid inclusions,liquid inclusions are more difficult to be removed,for they need much longer time to separate from the interface,and usually will be brought back to liquid steel by the steel flow before their separation.To reduce total oxygen content as much as possible,solid and nonwetting inclusions are expected to form during the refining process of Al-killed steel grades.

关 键 词：夹杂物形态 液态夹杂物 固态夹杂物 夹杂物去除率 接触角 钢-渣界面 

分 类 号：TF703[冶金工程—钢铁冶金]