热轧薄板坯生产中夹杂物控制区域的热力学分析  

Thermodynamic analysis for inclusions control area in hot rolled tinplate steel

作　　者：舒遗一 张丹阳[2] 温良英[2] 李斌 

机构地区：[1]重庆钢铁股份公司钢研所 [2]重庆大学材料科学与工程学院

出　　处：《重钢技术》2015年第3期31-35,共5页CISC Technology

摘　　要：为满足热轧薄板坯某钢种具有良好变形加工性能，要求成品钢液中碳含量在0．01％以下、硅含量在0．02％以下，脱氧基本上由铝来完成，产生的夹杂物主要是CaO—SiO2-A12O3系。本文通过Factsage热力学软件计算了CaO—SiO2—A12O3系夹杂物的低熔点区域，并对1873K时钢液与夹杂物间的平衡进行了计算，确定了该钢种在生产中，钢液中残余铝、氧和钙含量的控制范围。结果表明：夹杂物控制区域应在CaO-SiO2-A12O3系的低熔点区域2中；当钢液中铝含量为0．04％时，析出液态铝酸钙时钢液中氧含量为2．5～6．2ppm，残余钙含量为0．005％～0．02％。The carbon content is requested to be 0.01% or less, Si content 0.02% or less in the finished liquid steel to make some hot rolled sheet bar have a good deformation processing properties. The product of deoxidation in liquid steel is mainly CaO-SiO2-Al2O3 system in aluminum-killed. The low melting zones of CaO-SiO2-Al2O3 system are calculated using the Factsage thermodynamic software. Suggested the thermodynamic equilibrium between the inclusions and molten steel at 1873K, the appropriate content range of residual aluminum, oxygen and calcium is clear in the this tinplate manufacturing. The results indicate that the zone of inclusion should be controlled in the second low melting zone of the CaO-SiO2-Al2O3system . The content of dissolved aluminum in molten steel is 0.04%, the content of oxygen ranges from 2.5 to 6.2 ppm and the residue calcium is from 0.005% to 0.02% in the tinplate molten steel.

关 键 词：夹杂物 低熔点区域 热力学 CaO—SiO2-A12O3 

分 类 号：TF777.7[冶金工程—钢铁冶金]