工程科学学报，第41卷，第6期：757-762,2019年6月 Chinese Journal of Engineering,Vol.41,No.6:757-762,June 2019 DOI:10.13374/j.issn2095-9389.2019.06.007:http://journals.ustb.edu.cn 超低碳钢精炼过程中Fe一A1Ti0类复合氧化物夹杂 的演变与控制 顾超”，赵立华四，甘鹏” 1)北京科技大学钢铁治金新技术国家重点实验室，北京100083 2)北京科技大学治金与生态工程学院，北京100083 ☒通信作者，E-mail:15210951549@sina.cn 摘要超低碳钢是一种重要的汽车用钢材料，钢中通常添加钛元素，使其形成析出物，提高钢材的深冲性.然而钛元素作为 一种脱氧能力较强的元素，进入钢液中通常首先形成氧化物.为了减少含钛氧化物夹杂的生成，基于“转炉一H一连铸”的超 低碳钢生产流程，对RH精炼过程进行系统取样，分析了铝脱氧剂加入后及合金化元素钛加入后的氧、氮气体含量变化及夹杂 物特征变化，并使用FactSage热力学计算软件对Fe一AlTi0夹杂物稳定相图进行计算.研究结果显示，含钛类氧化物夹杂通 常以A山，0，类夹杂物作为形核质点，对其形成包裹状夹杂物.若避免含T夹杂物的生成，当钢中T质量分数为0.1%时，钢中 溶解A1质量分数应在0.01%以上.对含钛氧化物的生成及长大流程进行研究，通过对A山0，夹杂物及T,03夹杂物粗化率的 计算及附着功的比较可知，Ti,0,夹杂物在1600℃时的熟化生长速率较A山，03较大且Ti,0夹杂物与A山，03夹杂物相比不容 易相互碰撞融合并从钢液中去除.若提高精炼过程中的氧化物夹杂物去除率，应严格控制含钛氧化物类夹杂物的生成 关键词超低碳钢：RH精炼：A山203夹杂物：T,0,夹杂物 分类号TF769.2 Revolution and control of Fe-Al-Ti-O complex oxide inclusions in ultralow-earbon steel during refining process GU Chao),ZHAO Li-hua?),GAN Peng) 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083.China 2)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:15210951549@sina.cn ABSTRACT Ultralow-earbon steel is an important material for automobile production.Titanium is usually added in this steel grade to form a precipitant and improve the deep drawing property of the steel.However,due to the deoxidation capacity of Ti,Ti addition will directly generate Ti-bearing oxide inclusions instead of the precipitant.To reduce the amount of Ti-bearing oxide inclusions,samples were collected during the RH refining based on the basic oxygen furnace-Ruhrstahl-Heraeus reactor-continuous casting (BOF- RH-CC)ultralow-earbon steel production process,and the oxygen content and inclusion characterization after Al addition and Ti ad- dition were analyzed.The thermodynamics calculation software FactSage was adopted to calculate the Fe-Al-Ti-O inclusion stability phase diagram.The results show that the Al2O,inclusion usually acts as the nucleation point of the Ti-bearing oxide inclusion,which wraps the Al,O,inclusion to form the Al-Ti-O complex inclusion.To avoid the generation of the Ti-bearing oxide inclusions,the mass fraction of dissolved Al in the molten steel should be greater than 0.01%when the Ti mass fraction is 0.1%.Furthermore,the genera- tion and growth behavior of the Ti-bearing oxide inclusion were also studied.Based on the calculation of the growth rate and the com- 收稿日期：2018-12-20 基金项目：国家自然科学基金资助项目(5157419)工程科学学报，第 41 卷，第 6 期: 757--762，2019 年 6 月 Chinese Journal of Engineering，Vol． 41，No． 6: 757--762，June 2019 DOI: 10． 13374 /j． issn2095--9389． 2019． 06． 007; http: / /journals． ustb． edu． cn 超低碳钢精炼过程中 Fe--Al--Ti--O 类复合氧化物夹杂 的演变与控制 顾 超1) ，赵立华2) ，甘 鹏1) 1) 北京科技大学钢铁冶金新技术国家重点实验室，北京 100083 2) 北京科技大学冶金与生态工程学院，北京 100083 通信作者，E-mail: 15210951549@ sina． cn 摘 要 超低碳钢是一种重要的汽车用钢材料，钢中通常添加钛元素，使其形成析出物，提高钢材的深冲性． 然而钛元素作为 一种脱氧能力较强的元素，进入钢液中通常首先形成氧化物． 为了减少含钛氧化物夹杂的生成，基于“转炉—ＲH—连铸”的超 低碳钢生产流程，对 ＲH 精炼过程进行系统取样，分析了铝脱氧剂加入后及合金化元素钛加入后的氧、氮气体含量变化及夹杂 物特征变化，并使用 FactSage 热力学计算软件对 Fe--Al--Ti--O 夹杂物稳定相图进行计算． 研究结果显示，含钛类氧化物夹杂通 常以 Al2O3 类夹杂物作为形核质点，对其形成包裹状夹杂物． 若避免含 Ti 夹杂物的生成，当钢中 Ti 质量分数为 0. 1% 时，钢中 溶解 Al 质量分数应在 0. 01% 以上． 对含钛氧化物的生成及长大流程进行研究，通过对 Al2O3 夹杂物及 Ti2O3 夹杂物粗化率的 计算及附着功的比较可知，Ti2O3 夹杂物在 1600 ℃ 时的熟化生长速率较 Al2O3 较大且 Ti2O3 夹杂物与 Al2O3 夹杂物相比不容 易相互碰撞融合并从钢液中去除． 若提高精炼过程中的氧化物夹杂物去除率，应严格控制含钛氧化物类夹杂物的生成． 关键词 超低碳钢; ＲH 精炼; Al2O3 夹杂物; Ti2O3 夹杂物 分类号 TF769. 2 收稿日期: 2018--12--20 基金项目: 国家自然科学基金资助项目( 5157419) Ｒevolution and control of Fe--Al--Ti--O complex oxide inclusions in ultralow-carbon steel during refining process GU Chao1) ，ZHAO Li-hua2)  ，GAN Peng1) 1) State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China 2) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China Corresponding author，E-mail: 15210951549@ sina． cn ABSTＲACT Ultralow-carbon steel is an important material for automobile production． Titanium is usually added in this steel grade to form a precipitant and improve the deep drawing property of the steel． However，due to the deoxidation capacity of Ti，Ti addition will directly generate Ti-bearing oxide inclusions instead of the precipitant． To reduce the amount of Ti-bearing oxide inclusions，samples were collected during the ＲH refining based on the basic oxygen furnace—Ｒuhrstahl-Heraeus reactor—continuous casting ( BOF— ＲH—CC) ultralow-carbon steel production process，and the oxygen content and inclusion characterization after Al addition and Ti ad￾dition were analyzed． The thermodynamics calculation software FactSage was adopted to calculate the Fe--Al--Ti--O inclusion stability phase diagram． The results show that the Al2O3 inclusion usually acts as the nucleation point of the Ti-bearing oxide inclusion，which wraps the Al2O3 inclusion to form the Al--Ti--O complex inclusion． To avoid the generation of the Ti-bearing oxide inclusions，the mass fraction of dissolved Al in the molten steel should be greater than 0. 01% when the Ti mass fraction is 0. 1% ． Furthermore，the genera￾tion and growth behavior of the Ti-bearing oxide inclusion were also studied． Based on the calculation of the growth rate and the com-