铈和钙处理对NM450钢中夹杂物的影响  

Effects of cerium and calcium treatment on the inclusions in NM450 steel

作　　者：郭树豪 刘金瑞 高军[2] 樊立峰[3] 崔衡 GUO Shuhao;LIU Jinrui;GAO Jun;FAN Lifeng;CUI Heng(Collaborative Innovation Center of University of Science and Technology Beijing,Beijing,100083,China;Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Monolia,China;School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,Inner Monolia,China)

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]内蒙古包钢钢联股份有限公司制造部,内蒙古包头014010 [3]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《钢铁钒钛》2025年第1期158-164,共7页Iron Steel Vanadium Titanium

基　　金：中央引导地方科技发展资金(2022ZY0001)。

摘　　要：通过配置有AZtecFeature自动夹杂物分析模块的扫描电镜-能谱仪(SEM-EDS)和Factsage热力学计算,研究了国内某厂稀土NM450钢生产过程中的Ca处理和Ce处理对钢中夹杂物的演化过程的影响。结果表明:经过0.0015%Ce处理,钢液中主要夹杂物xCaO·yAl_(2)O_(3)被改性为低熔点xCaO·yAl_(2)O_(3)·zCe_(2)O_(3)、CeAlO_(3)+xCaO·yAl_(2)O_(3)、CeAlO_(3)+xCaO·yAl_(2)O_(3)+CaS和低熔点xCaO·yAl_(2)O_(3)·zCe_(2)O_(3)+CaS夹杂物。Ce处理20 min后,钢中约53%夹杂物被去除。钢液中[Ce]扩散进入xCaO·yAl_(2)O_(3)形成低熔点xCaO·yAl_(2)O_(3)·zCe_(2)O_(3)夹杂物。钢液中的xCaO·yAl_(2)O_(3)与[Ce]反应产生CeAlO_(3),进而生成CeAlO_(3)+xCaO·yAl_(2)O_(3)夹杂物。二次Ca处理后,含Ce夹杂物种类没有发生改变,尽管部分夹杂物转化为液态夹杂物,但同时导致了夹杂物总体数量上升,且CaS成为了主要夹杂物。这表明现行Ce处理协同双Ca处理的精炼工艺存在钙处理过量的问题。The effects of Ca treatment and Ce treatment on the steel inclusions during the steelmaking process of Ce-contented NM450 steel were studied.The evolution process of inclusions in steel was analyzed by Scanning electron microscope-energy dispersive spectrometer(SEM-EDS)equipped with AZtecFeature automatic inclusion analysis module and Factsage thermodynamic calculation.After 0.0015%Ce treatment,the main inclusions in the molten steel are modified from xCaO·yAl_(2)O_(3) into complex inclusions such as low melting point xCaO·yAl_(2)O_(3)·zCe_(2)O_(3),CeAlO_(3)+xCaO·yAl_(2)O_(3),CeAlO_(3)+xCaO·yAl_(2)O_(3)+CaS and low melting point xCaO·yAl_(2)O_(3)·zCe_(2)O_(3)+CaS.About 53%of the inclusions in the steel were removed after Ce treatment for 20 minutes.[Ce]diffuses into xCaO·yAl_(2)O_(3) to form low melting point xCaO·yAl_(2)O_(3)·zCe_(2)O_(3) inclusions in the molten steel.xCaO·yAl_(2)O_(3) in the molten steel reacts with[Ce]to produce CeAlO_(3),which in turn generates CeAlO_(3)+xCaO·yAl_(2)O_(3) inclusions.After the secondary Ca treatment,the Ce inclusion species did not change.Although some of the inclusions were converted into liquid inclusions,the overall number of inclusions increased,and CaS became the dominant inclusion.It indicates that there is a problem of excessive calcium treatment in the current Ce treatment combined with double Ca refining treatment processes.

关 键 词：非金属夹杂物 Ce处理 Ca处理 NM450钢 夹杂物改性 

分 类 号：TF76[冶金工程—钢铁冶金] TG115[金属学及工艺—物理冶金]