摘要
为明确转炉→LF精炼→连铸工艺条件下生产40Cr钢浸入式水口结瘤分层结构的形成机理,采用扫描电镜、阴极发光仪以及FactSage 7.1热力学软件,对40Cr钢水口结瘤形貌及分层结构进行了研究。结果表明,浸入式水口结瘤物分为水口脱碳层、凝钢层、夹杂物堆积层、凝钢层和表面疏松层。分析了40Cr钢在连铸过程中钢中Al2O3、Al2O3-CaO(SiO2)和Al2O3-MgO尖晶石在水口内壁上的分层沉积现象。结合现场工艺,研究了双凝钢层的形成机理,并通过热力学计算解释了结瘤物的形成机理。
In order to clarify the formation mechanism of the layered structure of 40 Cr steel submerged entry nozzle clogging under the conditions of BOF→LF refining→continuous casting process.The morphology and layered structure of 40 Cr steel nozzles were analyzed comprehensively by scanning electron microscopy,cathodoluminescence and FactSage7.1 thermodynamics software.The research shows that the submerged entry nozzle clogging from the nozzle side to the molten steel side is divided into a nozzle decarburization layer,a condensation steel layer,an inclusion accumulation layer,a condensation steel layer and a surface loose layer.The layered deposition of Al2O3,Al2O3-CaO(SiO2)and Al2O3-MgO spinel in the inner wall of 40 Cr steel in continuous casting process is revealed.Combined with the production process,the formation mechanism of the double-condensed steel layer was studied,and the formation mechanism of the clogging was explained by thermodynamic calculation.
作者
季莎
罗艳
张国锋
贾文军
任英
张立峰
JI Sha;LUO Yan;ZHANG Guo-feng;JIA Wen-jun;REN Ying;ZHANG Li-feng(1.School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Technology Center,Lingyuan Iron and Steel Co.,Ltd.,Lingyuan 122500,Liaoning,China)
出处
《钢铁》
CAS
CSCD
北大核心
2019年第8期124-131,201,共9页
Iron and Steel
基金
国家重点研发计划专项资助项目(2016YFB0300102)
中央高校基本科研业务费专项资金资助项目(FRF-TP-17-001C2)
关键词
水口结瘤
分层结构
夹杂物
热力学计算
nozzle clogging
layered structure
inclusion
thermodynamics calculation
