低碳低合金钢塞棒侵蚀机理研究及改进  

Research on stopper rod corrosion mechanism and improvement for low-carbon and low-alloy steel

作　　者：赵家七 麻晗 马建超 蔡小锋 李解 ZHAO Jiaqi;MA Han;MA Jianchao;CAI Xiaofeng;LI Jie(Institute of Research of Iron and Steel,Jiangsu/Shasteel,Zhangjiagang 215625,China;Converter Steelmaking Plant,Shasteel Co.,Ltd.,Zhangjiagang 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625 [2]江苏沙钢集团有限公司转炉炼钢厂,江苏张家港215625

出　　处：《炼钢》2022年第4期71-77,88,共8页Steelmaking

摘　　要：针对SAE系列低碳低合金钢在浇铸过程中出现塞棒头异常侵蚀问题,通过塞棒的物相分析及元素分布,研究塞棒的侵蚀机理,并提出相应的改进措施。结果表明,塞棒头中的碳含量高,与钢水中的氧反应,形成塞棒头表层脱碳层。钢水中高SiO_(2)组分的夹杂附着在塞棒头表层,与塞棒头本体耐材中的MgO、MgO·Al_(2)O_(3)反应,生成Mg_(2)SiO_(4)类的低熔点相,在钢水冲刷作用下被带入钢水,造成塞棒头侵蚀。通过选用低碳、高致密度且含适量SiC的塞棒头,提高炉渣碱度和降低钢水氧含量,塞棒头侵蚀问题显著改善,中包连浇炉数由8~10炉提高至15炉以上。In view of stopper rod abnormal erosion of SAE series low-carbon and low-alloy steel during casting process,stopper rod erosion mechanism and corresponding improvement measures were proposed through phase analysis and element distribution.The results show that the high carbon component in stopper rod reacts with the oxygen in molten steel to form a decarburized layer on the surface of stopper rod.The inclusions with high SiO_(2) component in molten steel adhere to the surface of stopper rod,react with MgO,MgO·Al_(2)O_(3),and form low melting point phase of Mg_(2)SiO_(4) type,which is brought into molten steel under the action of molten steel,causing corrosion of stopper rod.The abnormal corrosion of stopper rod was significantly improved by selecting stopper rod with low carbon,high density and appropriate amount of SiC,increasing basicity of slag and reducing oxygen content in molten steel,and the number of tundish continuous casting furnaces increased from 8-10 furnaces to more than 15 furnaces.

关 键 词：低碳低合金钢 塞棒侵蚀机理 钢水可浇性 

分 类 号：TF777.1[冶金工程—钢铁冶金]