摘要
超低碳IF钢RH精炼过程脱氧夹杂物的调控是影响连铸板坯质量的关键因素。通过对RH精炼-连铸过程夹杂物性质进行评估,根据Factsage软件热力学计算Fe-Al-Ti-O组分平衡相图;通过改进卧滴法测定不同w(Al)/w(Ti)成分钢液与氧化铝基板之间的界面特性,并在实验室统计不同w(Al)/w(Ti)对钢液中夹杂物数量分布。结果发现,生产中存在大型簇状氧化铝夹杂物,且活泼元素Ti、Mg等会附着在氧化铝表面形成Mg-Ti-O膜;相图计算结果表明,Ti质量分数为0.06%时,Al质量分数大于0.12%时才能完全抑制含Ti氧化膜的形成;钢液Al和Ti分别从0.017%和0.028%增加至0.0785%和0.045%,氧化铝与钢液之间的接触角从110.93°分别增加至133.73°和减小至101.49°;提高w(Al)/w(Ti)可以有效提高钢液纯净度。
The control of deoxidized inclusions in RH refining process of ultra-low carbon IF steel is a key factor affecting the quality of continuous casting slab. In this paper, the properties of inclusions in the actual RH refining and continuous casting process are evaluated, and the equilibrium phase diagram of the Fe-Al-Ti-O component is calculated based on the thermodynamics of Factage software. The interface characteristics between different w(Al)/w(Ti) composition steel liquid and an alumina substrate were measured by improving the horizontal drop method, and the number distribution of inclusions in molten steel for different w(Al)/w(Ti) was counted in the experiment. The results show that there are large clusters of alumina inclusions in actual production, and active elements such as Ti and Mg could adhere to the surface of alumina to form a Mg-Ti-O film. And, the phase diagram calculation results show that the formation of Ti-containing oxide films can be completely inhibited when the Ti content is 0.06% and the Al content is greater than 0.12%. Furthermore, the Al and Ti concentration in molten steel increased from 0.017% and 0.028% to 0.0785% and 0.045%, respectively, and the contact angle between alumina and molten steel increased from 110.93° to 133.73° and decreased to 101.49°, respectively;the purity of molten steel can effectively improve by increasing w(Al)/w(Ti).
作者
赵如
龙乾
王万林
ZHAO Ru;LONG Qian;WANG Wanlin(Technology Center of Liangang,Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417000,Hunan,China;School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China)
出处
《连铸》
2023年第6期62-69,共8页
Continuous Casting
基金
国家重点研发计划资助项目(2021YFB3702401)
国家自然科学基金重点资助项目(52130408)
湖南省科技资助项目(2020WK2003)。
关键词
Al脱氧
Ti合金化
界面特性
接触角
洁净度
Al deoxidation
Ti alloying
interface characteristics
contact angle
cleanliness
