镁碳砖中B的高温演变及对钢水的增B机制  

High temperature evolution of B in MgO-C brick of ladle slag line and its effect on axle steel

作　　者：齐江涛 李振[1] 李院高 徐镕杰 QI Jiangtao;LI Zhen;LI Yuangao;XU Rongjie(Technical Center of Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China;Shanxi Luweibao Taigang Refractories Co.,Ltd.,Taiyuan 030104,Shanxi,China)

机构地区：[1]山西太钢不锈钢股份有限公司技术中心,山西太原030003 [2]山西禄纬堡太钢耐火材料有限公司,山西太原030104

出　　处：《钢铁研究学报》2023年第8期982-988,共7页Journal of Iron and Steel Research

摘　　要：为探究钢包渣线镁碳砖中B的高温演变及其对车轴钢的增B机制,对镁碳砖使用前后B含量、物相组成以及显微结构分析。结合钢包温度先降后升和车轴钢铝脱氧特点,经过热力学计算分析后得到:钢包渣线耐材中含B_(2)O_(3)局部高温液相在温降时会析出9Al_(2)O_(3)·2B_(2)O_(3)(熔点1 965℃),导致液相B_(2)O_(3)含量升高,黏度降低;在浓度差和表面张力的驱动下,含B_(2)O_(3)局部高温液相沿着渣侵蚀耐火材料的路径逆向进入钢水;铝脱氧过程中,Al与含B_(2)O_(3)局部液相反应,生成单质B,进入钢水中造成增B。To investigate the high-temperature evolution of B in MgO-C bricks used in ladle slag line and its mechanism of increasing B in axle steel,the B content,phase composition,and microstructure of MgO-C bricks before and after used were analyzed.Based on the characteristics of ladle temperature decreasing first and then increasing,as well as aluminum deoxidation in axle steel,thermodynamic calculations and analysis have shown that the local high-temperature liquid phase containing B_(2)O_(3) in ladle slag line refractories will precipitate 9Al_(2)O_(3)·2B_(2)O_(3)(melting point of 1965℃)during temperature drop,leading to an increase in liquid B_(2)O_(3) content and a decrease in viscosity.Driven by concentration difference and surface tension,the local high-temperature liquid phase containing B_(2)O_(3) enters the molten steel in the reverse direction along the path of slag erosion of refractories.During the process of aluminum deoxidation,Al reacts with the local liquid phase containing B_(2)O_(3) to generate elemental B,which enters the molten steel and causes an increase in B.

关 键 词：钢包 镁碳砖 车轴钢 B高温演变 

分 类 号：TF769.2[冶金工程—钢铁冶金]