Abstract: In order to understand the vaporization behaviors of Mn in medium and high Mn steel grades during vacuum treatment, industrial experiments and thermodynamic calculations were carried out. The results indicate that Mn vaporization would lead to an obvious loss of Mn in steel, and the vaporization is strongly influenced by the steel temperature, Mn content and vacuum pressure. With the increase of temperature and Mn content in steel, the saturated vapor pressure of Mn increases, leading to an increasing vaporization of manganese. Meanwhile, lower vacuum pressure would also result in a stronger vaporization of dissolved Mn into gaseous Mn. The mass transfer of Mn in liquid steel would not be the controlling step of the vaporization process of Mn during VD and RH vacuum treatment.

摘要： 为了解释中高锰钢真空精炼过程中Mn的非氧化损失行为,进行了工业实验和热力学计算。研究结果表明,在真空条件下钢液中Mn会因气化而大量挥发损失。温度、钢中Mn含量以及精炼真空度对Mn的气化挥发行为有着很大的影响。随着温度的升高和钢液中Mn含量的增加,Mn在气相中的饱和蒸气压增加,Mn的气化挥发变得更加容易。同等条件下,真空度越低,钢液中的Mn越容易气化。在VD和RH真空精炼条件下,Mn在钢液中的传质不应是决定Mn气化挥发速率的限制性环节。

关键词: 中锰钢, 高锰钢, 气化挥发, 二次精炼, 真空处理