低硫非调质钢水口结瘤机理解析  

Analysis of nozzle clogging mechanism of low sulfur microalloyed medium carbon steel

作　　者：张璐 余大江 王梓菲 黎玉唐 付建勋 ZHANG Lu;YU Dajiang;WANG Zifei;LI Yutang;FU Jianxun(Center for Advanced Solidification Technology(CAST),School of Materials Science and Engineering,State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;Baosteel Central Research Institute,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院先进凝固技术中心省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]宝钢股份中央研究院,上海200444

出　　处：《炼钢》2024年第3期50-55,共6页Steelmaking

基　　金：国家自然科学基金资助项目(52074179,51874195)。

摘　　要：非调质钢含有较高的铝,经钙处理工艺后,易导致水口结瘤。采用X射线衍射仪、扫描电子显微镜分析了某厂低硫非调质钢连铸水口结瘤物试样,结合热力学计算分析,揭示水口结瘤的原因。研究表明:水口结瘤物主要为CaS,其在钢液凝固过程中从钢液中以直接、间接两种方式析出,钙添加过量是导致水口结瘤的主要原因,后续可通过优化钢液的钙铝比来保证连铸的顺行,消除结瘤现象。Microalloyed medium carbon steel contains high aluminum which is easy to cause nozzle clogging after calcium treatment process.In this paper,X-ray diffractometer and scanning electron microscope were used to analyze the samples of nozzle clogging in continuous casting of low sulfur microalloyed medium carbon steel in a factory.Combined with thermodynamic calculation and analysis,the causes of nozzle clogging were revealed.The results show that the nozzle clogging is mainly CaS,which precipitates from the molten steel in both direct and indirect ways during the solidification process of molten steel.Excessive calcium addition is the main reason for nozzle clogging.Subsequently,the ratio of calcium to aluminum in molten steel can be optimized to ensure the smooth operation of continuous casting and eliminate the phenomenon of clogging.

关 键 词：非调质钢 钙处理 水口结瘤 硫化钙 热力学分析 

分 类 号：TF775[冶金工程—钢铁冶金]