工程科学学报，第40卷，第8期：937-944,2018年8月 Chinese Journal of Engineering,Vol.40,No.8:937-944,August 2018 DOI:10.13374/j.issn2095-9389.2018.08.007;http://journals.ustb.edu.cn 增氮析氮法去除硅锰脱氧钢中夹杂物的研究 张杰)，刘建华)，闫柏军2)，李康伟)，刘洪波)，俞赛健) 1)北京科技大学工程技术研究院.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:liujianhua@metall.usth.edu.cm 摘要以硅锰脱氧的SWH82B热轧盘条为实验钢种，研究增氨析氮法对硅锰脱氧钢中夹杂物的去除效果，并设置0.02、 0.035,0.05,0.065和0.08MPa五组增氨压力进行热态实验.实验结果表明：在1873K的温度下，钢液经过增氮20min、真空处 理30min后，不同炉次钢中T[0]均下降至1×10-5以下，最低为4×10-6，T[N]均下降至5×106以下，最低为2×106，夹杂 物去除率均为40%以上，T[0]去除率均大于78%，表明该技术对硅锰脱氧钢中的夹杂物及T[0]有良好的去除效果.此外， 随着增氮压力的升高，钢中T[0]与夹杂物去除率均有所升高，当充氮压力为0.08MPa时，T[0]与夹杂物去除率分别达到 89.2%和87.4%.理论分析表明，随着增氨压力的升高，气泡形核率增大、钢中生成气泡数量增多、钢中气泡的密度增加，从而 提升气泡去除夹杂物的效率 关键词硅锰脱氧钢；增氨析氮法；增氮压力；夹杂物去除：T[0]去除率 分类号TF769.4 Nonmetallic inclusion removal of Si-Mn deoxidized steel by nitrogen absorption and release method ZHANG Jie,LIU Jian-hua,YAN Bo-jun2),LI Kang-wei,LIU Hong-bo,YU Sai-jian) 1)Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China 2)School of Metallurgical and Ecological Engineering,University of Seience and Technology Beijing,Beijing 100083.China Corresponding author,E-mail:liujianhua@metall.ustb.edu.cn ABSTRACT The micro nonmetallic inclusion and oxygen content in steel significantly affect its performance,and removing the inclu- sion involves a difficult process.A nitrogen absorption and release method has been developed with which nonmetallic inclusions and T[O]were efficiently removed from bearing steel.However,the inclusions in bearing steel are highly different from those in Si-Mn deoxidized steel,and the effect of the nitrogen absorption and release method on the Si-Mn deoxidized steel remains unclear.Based on this,a thermal experiment was carried out in this study to investigate the removal of nonmetallic inclusions from Si-Mn deoxidized steel by nitrogen absorption and release method,where SWRH82B hot rolled wire coil was used as the experimental steel,and five groups of increasing nitrogen pressure (0.02,0.035,0.05,0.065 and 0.08 MPa)were set up.The results show that for all groups,the T[] and T[N]in the steel reduce to below 1x10-and 5x10,respectively,after the molten steel is subjected to 20 min of increasing nitrogen and 30 min of vacuum treatment.The lowest T[O]and T[N]in the steel is 4x10and 2x10,respectively,and the in- clusion removal rates for all the groups are more than 40%.The T[O]removal rates for all the groups are more than 78%.This result proves that nitrogen absorption and release method is efficient in removing inclusions and T[O]in Si-Mn deoxidized steel.Further- more,the removal rate of inclusion and T[O]in the steel increases with the nitrogen pressure.When the nitrogen pressure is 0.08 MPa,the removal rates of T[]and the inclusions are 89.2%and 87.4%,respectively.Theoretical analysis shows that the nucleation 收稿日期：2017-09-05 基金项目：十三五重点研发计划资助项目(2017YFB0304905)工程科学学报,第 40 卷,第 8 期:937鄄鄄944,2018 年 8 月 Chinese Journal of Engineering, Vol. 40, No. 8: 937鄄鄄944, August 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 08. 007; http: / / journals. ustb. edu. cn 增氮析氮法去除硅锰脱氧钢中夹杂物的研究 张 杰1) , 刘建华1) 苣 , 闫柏军2) , 李康伟1) , 刘洪波1) , 俞赛健1) 1) 北京科技大学工程技术研究院, 北京 100083 2) 北京科技大学冶金与生态工程学院, 北京 100083 苣 通信作者, E鄄mail: liujianhua@ metall. ustb. edu. cn 摘 要 以硅锰脱氧的 SWRH82B 热轧盘条为实验钢种,研究增氮析氮法对硅锰脱氧钢中夹杂物的去除效果,并设置 0郾 02、 0郾 035、0郾 05、0郾 065 和0郾 08 MPa 五组增氮压力进行热态实验. 实验结果表明:在1873K 的温度下,钢液经过增氮20 min、真空处 理 30 min 后,不同炉次钢中 T[O]均下降至 1 伊 10 - 5以下,最低为 4 伊 10 - 6 ,T[N]均下降至 5 伊 10 - 6以下,最低为 2 伊 10 - 6 ,夹杂 物去除率均为 40% 以上,T[O]去除率均大于 78% ,表明该技术对硅锰脱氧钢中的夹杂物及 T[O]有良好的去除效果. 此外, 随着增氮压力的升高,钢中 T[O]与夹杂物去除率均有所升高,当充氮压力为 0郾 08 MPa 时,T[O]与夹杂物去除率分别达到 89郾 2% 和 87郾 4% . 理论分析表明,随着增氮压力的升高,气泡形核率增大、钢中生成气泡数量增多、钢中气泡的密度增加,从而 提升气泡去除夹杂物的效率. 关键词 硅锰脱氧钢; 增氮析氮法; 增氮压力; 夹杂物去除; T[O]去除率 分类号 TF769郾 4 收稿日期: 2017鄄鄄09鄄鄄05 基金项目: 十三五重点研发计划资助项目(2017YFB0304905) Nonmetallic inclusion removal of Si鄄鄄Mn deoxidized steel by nitrogen absorption and release method ZHANG Jie 1) , LIU Jian鄄hua 1) 苣 , YAN Bo鄄jun 2) , LI Kang鄄wei 1) , LIU Hong鄄bo 1) , YU Sai鄄jian 1) 1) Institute of Engineering Technology, 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 苣 Corresponding author, E鄄mail: liujianhua@ metall. ustb. edu. cn ABSTRACT The micro nonmetallic inclusion and oxygen content in steel significantly affect its performance, and removing the inclu鄄 sion involves a difficult process. A nitrogen absorption and release method has been developed with which nonmetallic inclusions and T[O] were efficiently removed from bearing steel. However, the inclusions in bearing steel are highly different from those in Si鄄鄄 Mn deoxidized steel, and the effect of the nitrogen absorption and release method on the Si鄄鄄Mn deoxidized steel remains unclear. Based on this, a thermal experiment was carried out in this study to investigate the removal of nonmetallic inclusions from Si鄄鄄Mn deoxidized steel by nitrogen absorption and release method, where SWRH82B hot rolled wire coil was used as the experimental steel, and five groups of increasing nitrogen pressure (0郾 02, 0郾 035, 0郾 05, 0郾 065 and 0郾 08 MPa) were set up. The results show that for all groups, the T[O] and T[N] in the steel reduce to below 1 伊 10 - 5 and 5 伊 10 - 6 , respectively, after the molten steel is subjected to 20 min of increasing nitrogen and 30 min of vacuum treatment. The lowest T[O] and T[N] in the steel is 4 伊 10 - 6 and 2 伊 10 - 6 , respectively, and the in鄄 clusion removal rates for all the groups are more than 40% . The T[O] removal rates for all the groups are more than 78% . This result proves that nitrogen absorption and release method is efficient in removing inclusions and T[O] in Si鄄鄄 Mn deoxidized steel. Further鄄 more, the removal rate of inclusion and T[O] in the steel increases with the nitrogen pressure. When the nitrogen pressure is 0郾 08 MPa, the removal rates of T[O] and the inclusions are 89郾 2% and 87郾 4%, respectively. Theoretical analysis shows that the nucleation