不同脱氧方式对钢中夹杂物的影响  

Effect of deoxidation methods on inclusions in steel

作　　者：邓志银[1] 朱苗勇[1] 钟保军 高新亮[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819 [2]邢台钢铁有限责任公司技术中心,邢台054027

出　　处：《北京科技大学学报》2012年第11期1256-1261,共6页Journal of University of Science and Technology Beijing

基　　金：教育部基本科研业务费专项(N100102001)

摘　　要：为控制钢液中氮含量,实验了两种不同脱氧方式:(Ⅰ)出钢过程加Al进行强脱氧;(Ⅱ)出钢时不加Al,加入Si--Mn合金进行弱脱氧,在LF进站再喂入Al线进行强脱氧.借助气体分析仪和扫描电镜对不同脱氧方式下钢中氧氮含量和夹杂物进行了分析.两种不同脱氧方式得到最终产品的全氧含量几乎一致,但方式(Ⅱ)对控制氮含量更为有利,可以使氮的质量分数降低约5×10-6;两种不同脱氧方式对最终产品中夹杂物的类型和尺寸影响不大,均为球状的CaS和CaO--MgO--Al2O3夹杂物.文中还推断出了采用Si--Mn弱脱氧时钢中夹杂物的生成过程.In order to control the nitrogen content of liquid steel,two different deoxidation methods were applied：（Ⅰ） Al blocks were added for deoxidation when tapping;（Ⅱ） Si-Mn alloys without Al were added for deoxidation at first when tapping,and then Al wires were fed at the LF station.The oxygen content,nitrogen content and inclusions in steel deoxidized by the two methods were analyzed by gas analyzer and scanning electron microscopy（SEM）.It is found that the total oxygen content of the final product is almost the same with the two deoxidation methods,while the method（Ⅱ） is more advantageous to control the nitrogen content and by using the deoxidation method the nitrogen content can decrease by about 5×10^-6.Both the deoxidation methods affect little the type and size of inclusions in the final product,and most of the inclusions are globular CaS and CaO-MgO-Al2O3 inclusions.The formation process of inclusions during Si-Mn deoxidation was inferred according to SEM observations and thermodynamics.

关 键 词：炼钢 脱氧 夹杂物 氮 热力学 

分 类 号：TF704.1[冶金工程—钢铁冶金]