铝脱氧钢中Al_(2)O_(3)夹杂物与Al_(2)O_(3)-C质水口耐材的粘附机理研究  

Study on the adhesion mechanism of Al_(2)O_(3)inclusions on Al_(2)O_(3)-C refractory in Al-killed steel

作　　者：于会香[1] 霍文聪 邱光元 郝丽霞 刘春阳 YU Huixiang;HUO Wencong;QIU Guangyuan;HAO Lixia;LIU Chunyang(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Qian’an Iron&Steel Co.,Ltd.,Beijing Shougang Co.,Ltd.,Qian’an 064404,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京首钢股份有限公司迁安钢铁公司,河北迁安064404

出　　处：《炼钢》2024年第1期59-67,共9页Steelmaking

基　　金：国家自然科学基金资助项目(52274315)。

摘　　要：铝脱氧钢连铸过程中的水口堵塞一直是困扰生产的难题,弄清水口堵塞的形成机理对解决该问题非常重要。研究首先在实验室制备了含有单一、量多的Al_(2)O_(3)夹杂物的钢液,然后与Al_(2)O_(3)-C质耐材棒反应不同时间,研究了钢中Al_(2)O_(3)夹杂物与耐材棒的粘附行为,在此基础上探讨了铝脱氧钢连铸过程水口堵塞的形成机理。研究发现,耐材棒与钢液反应一段时间后,在耐材棒表面由内向外逐渐形成两层Al_(2)O_(3),第1层致密平滑,厚度较薄;第2层松散粗糙,厚度较厚。水口堵塞的形成机理为,耐材插入钢液一段时间内,因温度升高,耐材表面区域的SiO_(2)、Al_(2)O_(3)与C反应生成的SiO、Al_(2)O气体向钢液扩散,在耐材表面分别与钢液中的[Al]、耐材中的SiO_(2)反应生成Al_(2)O_(3);耐材棒表面的SiO_(2)也会与钢液中的[Al]反应生成Al_(2)O_(3);三者共同作用形成第1层致密的Al_(2)O_(3)。第1层Al_(2)O_(3)层形成后,钢液中的Al_(2)O_(3)夹杂物易于在其上面附着,形成第2层松散的Al_(2)O_(3)。随着时间的延长,Al_(2)O_(3)层变厚,水口堵塞逐渐形成。第1层Al_(2)O_(3)形成机理以化学反应为主,增长缓慢;第2层以钢中夹杂物粘附为主,增长较快。The nozzle clogging during continuous casting process of Al-killed steel is a difficult problem.It is very important to make clear the formation mechanism of the nozzle clogging to solve the problem.In this study,molten steel containing a single type of Al_(2)O_(3)inclusions was prepared firstly in laboratory,then a Al_(2)O_(3)-C refractory rod was dipped into it and reacted for different times to study the adhesion behavior of Al_(2)O_(3)inclusions on the refractory rod.Based on the experimental results,the formation mechanism of nozzle clogging during continuous casting of Al-killed steel was explored.It was found that after a period of time,two layers of Al_(2)O_(3)were gradually formed on the surface of the refractory rod from inside to outside.The first layer was dense and smooth with smaller thickness,and the second layer was loose and rough with larger thickness.The formation mechanism of nozzle clogging was explored as follows,after the refractory rod was dipped into molten steel for a certain time,the SiO_(2),Al_(2)O_(3)and C in the surface area of refractory reacted and SiO,Al_(2)O gases was generated due to the rise of temperature.Then the gases diffused to the liquid steel,and reacted with Al in steel and SiO_(2) in refractory respectively at the interface between the refractory and steel to generate Al_(2)O_(3).At the same time,SiO_(2) on the surface of the refractory rod would also react with Al in molten steel to form Al_(2)O_(3).After the first Al_(2)O_(3)layer was formed,the Al_(2)O_(3)inclusions in liquid steel were easily attached to it,then the second layer of loose Al_(2)O_(3)was formed.With the extension of time,the Al_(2)O_(3)layer became thicker,and the nozzle clogging was developed gradually.The formation of the first Al_(2)O_(3)layer was due to chemical reaction and grew slowly;the second Al_(2)O_(3)layer was mainly due to the adhesion of inclusions in steel on the first layer and grew faster.

关 键 词：铝脱氧钢 连铸 水口堵塞 Al_(2)O_(3)夹杂物 粘附机理 

分 类 号：TF777[冶金工程—钢铁冶金]