钙处理过程夹杂物演变及热力学分析

通过检测分析钙处理前后钢中夹杂物的形貌和成分的变化,探讨钢液钙处理过程中夹杂物演变规律.利用热力学计算,优化钙处理工艺.结果表明,钙处理可以将钢液中不规则固态夹杂物改性为球形液态夹杂物;1873 K下,当[Al]为0.030%时,[O]控制在5×10^-617×10^-6,[Ca]控制在0.7×10^-630×10^-6,钢中夹杂物变性效果良好;当[Al]为0.030%时,[S]控制在6×10^-619×10^-6,既能使钢中Al₂O₃夹杂生成液态铝酸钙夹杂物,同时又可以减少CaS生成.

Evolution of inclusions during calcium treatment in liquid steel and its thermodynamic analysis

The morphologies and compositions of typical inclusions in liquid steel before and after calcium treatment were observed to study the evolution mechanism of non-metallic inclusions during calcium treatment. The process of calcium treatment could be modified by thermodynamic analysis. Results show that irregular solid inclusions finally change into spherical inclusions after calcium treatment. When the mass fraction of aluminum in liquid steel is 0.03% at 1873 K, the mass fractions of oxygen and calcium should be controlled in the range of 5×10^-6~17×10^-6 and 0.7×10^-6~30×10^-6, respectively. Inclusions in liquid steel can be modified effectively. When the mass fraction of sulfur in liquid steel at 1873 K is in the range of 6×10^-6~19×10^-6, liquid calcium aluminate inclusions can be formed via Al₂O₃, and the formation of CaS can be decreased.