增氮析氮法去除硅锰脱氧钢中夹杂物的研究  

Nonmetallic inclusion removal of Si-Mn deoxidized steel by nitrogen absorption and release method

作　　者：张杰 刘建华 闫柏军[2] 李康伟 刘洪波 俞赛健 ZHANG Jie;LIU Jian-hua;YAN Bo-jun;LI Kang-wei;LIU Hong-bo;YU Sai-jian(Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[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

出　　处：《工程科学学报》2018年第8期937-944,共8页Chinese Journal of Engineering

基　　金：十三五重点研发计划资助项目(2017YFB0304905)

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0.02、0.035、0.05、0.065和0.08 MPa五组增氮压力进行热态实验.实验结果表明：在1873 K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1×10^-5以下,最低为4×10^-6,T[N]均下降至5×10^-6以下,最低为2×10^-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0.08 MPa时,T[O]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.The micro nonmetallic inclusion and oxygen content in steel significantly affect its performance,and removing the inclusion 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 SWRH82 B 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[O]and T[N] in the steel reduce to below 1×10^-5 and 5×10^-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 4×10^-6 and 2×10^-6,respectively,and the inclusion 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.Furthermore,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[O] and the inclusions are 89.2% and 87.4%,respectively.Theoretical analysis shows that the nucleationrate,number,and density of bubble in molten steel increase with pressure,the efficiency of the inclusions removal can be promoted.

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：TF769.4[冶金工程—钢铁冶金]