针对ASP的IF钢冶炼工艺洁净度研究

来源期刊：钢铁钒钛2011年第1期

论文作者：岳峰 袁晓峰 李朋欢 肖超平 吴维双

文章页码：47 - 52

关键词：IF钢； 洁净度； 显微夹杂物； 大型夹杂物； 钙处理

Key words：IF steel； cleanliness； micro-inclusions； macro-inclusions； calcium treatment

摘    要：对ASP流程生产IF钢时T[O]、[N]和显微夹杂物的演变行为以及铸坯中大型夹杂物进行系统研究。结果表明,铸坯平均T[O]为29×10^-6,平均[N]为35.7×10^-6,増氮主要发生在钙处理环节。RH加铝1min后钢中生成块状、棒状氧化铝夹杂,并且夹杂物之间发生初步聚集,随后的1～2min内松散聚合团烧结转变为大尺寸的致密簇状夹杂物。加入钛铁后,钢中主要为Al-Ti-O系夹杂物,并且随着循环时间的延长逐渐球化。钙处理后钢中77%的夹杂物成分介于CaO·2Al₂O₃～CaO·6Al₂O₃之间。铸坯中除球状Ca-Al-Ti-O-S系复合夹杂外,还存在凝固过程中析出的方形或多齿状TiN类夹杂,大型夹杂物则主要来源于水口内壁沉积物、钢包引流砂和结晶器保护渣等。

Abstract: The total oxygen content,nitrogen content as well as evolution behavior of the inclusions during RH refining and continuous casting in IF steel production were investigated.The following results were found.Firstly,the average total oxygen content and nitrogen content in the slab were 29×10^-6 and 35.7×10^-6 respectively,and calcium treatment were responsible for nitrogen pick-up.Lumpy,bar-like single alumina inclusions and loose groups were observed in steel bath the first minute after Al addition,and the fluid flow enhanced the formation and densification of clusters within the next 1～2 min.The addition of Ti resulted in the formation of Al-Ti-O complex inclusions which were changed into sphere as time passed.77% of the inclusions were between CaO·2Al₂O₃ and CaO·6Al₂O₃ after the calcium treatment.In addition to spherical Ca-Al-Ti-O-S complex inclusions,rectangular or multi-dentate TiN inclusions precipitated during solidification were found in the slab.Ultimately,the macro-inclusions were mainly from entrapment of SEN deposits,ladle drainage sand,mold powder and so on.