超低碳铝脱氧钢中FeOx对水口结瘤的影响  

Effect of FeO_x in an ultra-low carbon Al-killed steel on nozzle clogging

作　　者：黄日康 张立峰 姜仁波 郭银涛 周秋月 段豪剑 HUANG Ri-kang;ZHANG Li-feng;JIANG Ren-bo;GUO Yin-tao;ZHOU Qiu-yue;DUAN Hao-jian(School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Lab of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China;Tangshan Stainless Steel Co.,Ltd.,Tangshan 063100,Hebei,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]燕山大学亚稳材料科学技术国家重点实验室,河北秦皇岛066004 [3]唐山不锈钢有限责任公司,河北唐山063100

出　　处：《钢铁》2021年第1期43-50,84,共9页Iron and Steel

基　　金：国家自然科学基金资助项目(U1860206,51725402)。

摘　　要：为研究含FeOx结瘤物的形成和演变,使用扫描电子显微镜-能量色散光谱仪对超低碳铝脱氧含钛IF钢的水口结瘤物进行分析。结瘤物分为凝钢层和主体层。由于氧化物形貌和成分的差异,结瘤物主体层呈现出明显的分层现象,从水口本体至钢液方向依次为呈交织网状的细长条状Al2O3、点状分布的单颗粒Al2O3、连绵成片的FeOx-Al2O3和点状分布的单颗粒Al2O3。凝钢边缘存在主要成分为FeOx、Al2O3和FeO·Al2O3的FeOx-Al2O3复合物薄层。FeOx-Al2O3薄层中,靠近凝钢的部分其Al2O3含量较高,相对远离凝钢的部分其FeOx含量较高。热力学计算结果表明,1 536 oC钢液中[O]质量分数大于0.041 0%时,钢液中可以生成FeO和FeO·Al2O3。当水口内部钢液发生二次氧化时,钢滴会先生成FeOx-Al2O3复合氧化物,然后FeOx与钢滴内部的[Al]反应生成Al2O3,同时FeOx-Al2O3复合氧化物会黏附外部的Al2O3。FeOx在水口结瘤中起到黏结剂的作用。The nozzle clogging of an ultra-low carbon Al-killed steel was analyzed using scanning electron microscopy-energy dispersive spectrometer to study the formation and evolution of FeOxcontaining clogs.Clogs were divided into the frozen steel layer and the main layer.Due to the difference in morphology and composition of oxides,the main layer of clogs presented obvious stratification phenomenon and varied from the matrix of the nozzle to the molten steel as follow:a network formed by elongated strips of Al2O3,single particles of Al2O3 distributed in a dotted pattern,continuous sheets of FeOx-Al2O3 and dot-like particles of Al2O3.There was a thin layer of FeOx-Al2O3 at the edge of frozen steels with the main components of FeOx,Al2O3 and FeO·Al2O3.In the FeOx-Al2O3 layer,the part near the frozen steel had a higher content of Al2O3,while the part relatively far from the frozen steel had a higher content of FeOx.Thermodynamic calculation results show that when the content of[O]in the molten steel at 1 536℃is greater than 0.041 0%,FeO and FeO·Al2O3 can be generated in the molten steel.When oxidation occurs,composite oxides of FeOx-Al2O3 form first.Then FeOx will react with[Al]in the steel drop and Al2O3 will be formed,while the external Al2O3 will adhere to the composite oxide of FeOx-Al2O3.FeOx acted as a binder in the nozzle clogging.

关 键 词：超低碳铝脱氧IF钢 水口结瘤 FeOx 形貌与成分 热力学计算 

分 类 号：TF703[冶金工程—钢铁冶金]