复合脱氧方式对LG700钢中夹杂物的影响分析  

Analysis of influence of complex deoxidation on inclusions in LG700 steel

作　　者：肖爱达[1] 梁亮[1] 周剑丰[1] 谢世正[1] 张波 汪雄 XIAO Ai-da;LIANG Liang;ZHOU Jian-feng;XIE Shi-zheng;ZHANG Bo;WANG Xiong(Lianyuan Iron and Steel Corporation of Hunan Htuling,Loudi 417000,Hunan,China;Sclool of Metallurgical and Material Engincering,Hnan University of Technology,Zhuzhou 412007,Hunan,China)

机构地区：[1]湖南华菱涟源钢铁有限公司,湖南娄底417000 [2]湖南工业大学冶金与材料工程学院,湖南株洲412007

出　　处：《中国冶金》2020年第10期22-27,共6页China Metallurgy

基　　金：湖南省科技创新计划资助项目(2018XK2301);湖南省自然科学基金资助项目(2019JJ60062)。

摘　　要：为了研究钢中夹杂物的影响因素,采用两种不同的脱氧方法研究了合金加入顺序对LG700钢复合脱氧过程中夹杂物的影响。其中,方法Ⅰ为先加Al合金再加Si-Mn合金;方法Ⅱ为先加Si-Mn合金再加Al合金。通过对钢中氧氮含量及显微夹杂物进行分析,对脱氧产物生成过程进行推断。研究结果表明,转炉脱氧时合金加入顺序对钢水全氧含量不会有明显影响,但采用先加Si-Mn合金脱氧时,钢水中氮含量明显低于先加入Al脱氧的钢水;合金加入顺序对转炉初生夹杂的尺寸和成分均存在影响,导致其长大和去除速度存在差别,从而使得钢水中夹杂物的尺寸、成分以及粒径分布存在区别。根据试验结果,在采用方法Ⅱ脱氧时,更有利于钢中生成的Al2O3-MnO-SiO2复合夹杂而被去除,从而降低钢中大尺寸夹杂物数量。In order to study the influence factors of inclusions in steel,two different deoxidization methods were adopted to investigate the influence of alloy addition sequence on inclusions in LG700 steels during complex deoxidization. In methodⅠ, Al was added first followed by Si-Mn alloy. In method Ⅱ, Si-Mn alloy was added first followed by Al. Afterward, the contents of oxygen and nitrogen and the microscopic inclusions in the steel were analyzed and the formation process of deoxidized products was deduced. The results showed that the alloy addition sequence had no obvious effect on the total oxygen content of the molten steel, but the content of nitrogen content in the steel deoxidized by method Ⅱ was significantly lower than that by method Ⅰ. It had an influence on the size and composition of the initial inclusions, resulting in the difference of growth and removal capacity, which caused the difference of the size, composition and particle size distribution of inclusions in steel. According to the experimental results, when method Ⅱwas used for deoxidization, the composite Al2O3-MnO-SiO2 inclusions were more favorable to be removed, thus reducing the number of large inclusions in steel.

关 键 词：炼钢 复合脱氧 夹杂物 合金加入顺序 出钢过程 

分 类 号：TF704.1[冶金工程—钢铁冶金]