稀土对HRB400E热轧钢筋连铸坯夹杂物的影响  

Influence of rare earth elements on inclusions of HRB400E hot-rolled rebar billet

作　　者：陆晓杰 李健 陆恒昌 杨边疆 徐德祥 董瀚[1,3] LU Xiaojie;LI Jian;LU Hengchang;YANG Bianjiang;XU Dexiang;DONG Han(School of Materials Science and Engineering,Shanghai University,Shanghai 201800,China;Shaanxi Steel Group Industrial Innovation Research Institute Co.,Ltd.,Hanzhong 723000,Shaanxi,China;Zhejiang Institute of Advanced Materials,Shanghai University,Jiaxing 314000,Zhejiang,China;Shanghai University New Materials(Taizhou)Research Institute,Taizhou 225500,Jiangsu,China)

机构地区：[1]上海大学材料科学与工程学院,上海201800 [2]陕钢集团产业创新研究院有限公司,陕西汉中723000 [3]上海大学(浙江)高端装备基础件材料研究院,浙江嘉兴314000 [4]上海大学新材料(泰州)研究院,江苏泰州225500

出　　处：《中国冶金》2024年第4期79-87,共9页China Metallurgy

基　　金：河北省重点研发计划资助项目(20311009D)。

摘　　要：为了探究稀土对HRB400E钢中非金属夹杂物的影响,采用扫描电镜(SEM)、夹杂物自动分析系统(OTS)对不加稀土连铸坯(S质量分数0.023%,O质量分数0.006%)和加稀土连铸坯(S质量分数0.027%,O质量分数0.011%,La+Ce质量分数0.0206%)中的夹杂物进行了对比分析。结果表明,加入稀土后硫化锰类(MnS)夹杂物数量所占比例约70%,变化不大,主要改性了二氧化硅-硫化锰类(SiO_(2)-MnS)、硅酸盐类(Silicate)和硅酸盐-硫化锰类(Silicate-MnS)夹杂物,使其比例分别从18.46%下降到2.86%,5.54%下降到0.40%和4.00%下降到1.15%,并生成了稀土复合氧化物-硫化锰类(REO-Oxide-MnS)、稀土复合氧化物类(REO-Oxide)等稀土夹杂物,所占比例分别为15.78%和5.88%。加入稀土后粒径为[1,10]μm夹杂物密度上升,粒径大于10μm的夹杂物密度下降,夹杂物总体密度从154个/mm^(2)上升到170个/mm^(2),平均尺寸从2.52μm略微上升到2.63μm,变化不明显。稀土的添加将最大尺寸夹杂物出现的位置从距内弧1/4处转移到中心,连铸坯上MnS和Silicate-MnS密度从边部到中心减少的趋势没有改变,而SiO_(2)-MnS、Silicate类夹杂物密度的变化趋势由从边部到中心减少变为增加,生成的稀土夹杂物密度从边部到中心先增加后减少。研究结果为利用稀土调控钢中夹杂物提供了依据。In order to explore the effect of rare earth on non-metallic inclusions in HRB400E steel,scanning electron microscope(SEM)and automatic inclusion analysis system(OTS)were used to compare and analyze the inclusions in the continuous casting billet without rare earth(w(S)is 0.023%,w(O)is 0.006%)and with rare earth(w(S)is 0.027%,w(O)is 0.011%,w(La+Ce)is 0.0206%).The results show that after the addition of rare earth,the proportion of manganese sulfide(MnS)inclusions is about 70%,and there is little change.Silica-manganese sulfide(SiO_(2)-MnS),silicate(Silicate)and silicate-manganese sulfide(Silicate-MnS)are mainly modified,and the proportion is reduced from 18.46%to 2.86%,5.54%to 0.40%and 4.00%to 1.15%,respectively.Rare earth inclusions such as rare earth composite oxide-manganese sulfide(REO-Oxide-MnS)and rare earth composite oxides(REO-Oxide)are formed,accounting for 15.78%and 5.88%,respectively.With the addition of rare earth elements,the density of inclusions with particle size of[1,10]μm increases,while the density of inclusions with particle size greater than 10μm decreases,the overall inclusion density increases from 154 pieces/mm^(2) to 170 pieces/mm^(2),and the average size increases slightly from 2.52μm to 2.63μm.With the addition of rare earth elements,the position of the maximum size inclusion is transferred from one-fourth of the distance from the arc to the center,the decreasing trend of MnS and Silicate-MnS density from edge to center on continuous casting billet is not changed,while the decreasing trend of SiO_(2)-MnS and silicate inclusion density from edge to center is changed to increasing trend,and the density of rare earth inclusion increases at first and then decreases from edge to center.The study results provide a basis for controlling inclusions in steel with rare earth.

关 键 词：非金属夹杂物 稀土元素 连铸坯 螺纹钢 自动扫描电镜分析 

分 类 号：TF777[冶金工程—钢铁冶金]