中碳钢钙处理夹杂物变性的“液相窗口”控制模型  

Model of “Liquid Window” by Calcium Treatment in Medium Carbon Steel

作　　者：马志飞[1] 孙彦辉[1] 曾亚南[1] 艾西[1] 刘瑞宁 刘泳 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]石家庄钢铁(集团)公司,河北石家庄050000

出　　处：《钢铁》2013年第11期37-42,共6页Iron and Steel

摘　　要：系统研究了国内某钢厂生产的中碳钢Q345B钙处理前后夹杂物类型的变化,从热力学上分析铝脱氧钢中Al2O3夹杂物变性机制及夹杂物中CaS合理控制的条件,确立了夹杂物变性的“液相窗口”模型.热力学计算表明,温度为1873K,w（[Al]）为0.016％时,Al2O3转变为液态钙铝酸盐需要使钢中w（[Ca]）为0.0017％～0.0102％.生产实践表明,钙喂入量在0.0014％～0.0017％时,钙处理可以将钢中高熔点Al2O3的夹杂物转化为低熔点的12CaO· 7Al2O3和CaO·Al2O3夹杂物,MnS基本转化为CaS,且无单独CaS析出.The variations of inclusion types in Q345B steel was investigated before and after calcium treatment. The modification mechanism of alumina and the condition of the precipitation of calcium sulfide were analyzed by thermodynamics. Meanwhile, the model of ＂liquid window＂ regarding the modification of inclusions was established. Thermodynamic calculations show that ： in order to modify the alumina inclusions to liquid calcium aluminate, the content of calcium in steel from 0. 001 7 %to 0.010 2 % is needed when the aluminum in steel is 0. 016% at 1 873 K. The result of industrial production reveals that alumina can be modified into 12CaO· 7Al2O3 or CaO · Al2 O2 inclusion when the content of calcium in steel is between 0. 0014% and 0. 001 7%. While MnS just can be partially modified into CaS and no single precipitation of CaS occurred.

关 键 词：钙处理 钙铝酸盐 硫化钙 液相窗口 变性 

分 类 号：TF703.8[冶金工程—钢铁冶金]