以添加微量稀土元素Ce的洁净钢为例,研究了Ce在洁净钢中变质夹杂物的行为,并对稀土夹杂物进行了热力学理论分析和吉布斯自由能计算。研究结果表明:在低氧、低硫的钢液体系下,Ce的脱氧、脱硫效果显著,脱氧率和脱硫率分别达到了44%和40%;稀土夹杂物以Ce_2O_2S和CeAlO_3为主。 Taking the clean steel with addition of trace rare earth element Ce as an example, the behavior of Ce in inclusions in clean steel was studied. The thermodynamic theory analysis and Gibbs free energy calculation of rare earth inclusions were also carried out. The results show that under the condition of low oxygen and low sulfur, the deoxidation and desulfurization effects of Ce are remarkable, and the deoxidation rate and desulfurization rate reach 44% and 40% respectively. The rare earth inclusions are dominated by Ce_2O_2S and CeAlO_3.