针对表面活性元素影响钢液吸氮机理进行了研究，并提出了“表面结构模型”。结合Ｆｅ－Ｓ合金熔体，该模型认为：表面活性元素硫在表面富集，其表面层除了有Ｓ、Ｆｅ原子以外，还有ＦｅＳ、ＦｅＳ２分子存在。结合有关表面活性元素影响钢液吸氮热态实验结果进行了讨论，研究说明了氧、硫对钢液吸氮有大的阻碍作用 Aiming at the effect of surface active elements on the nitrogen absorption mechanism of molten steel, a “surface structure model” was proposed. In combination with the Fe-S alloy melt, the model states that the surface active element sulfur is enriched on the surface, and besides the S and Fe atoms in the surface layer, FeS and FeS2 molecules exist. The results of experiments on the influence of surface active elements on the nitrogen absorption of nitrogen in liquid steel are discussed. The results show that oxygen and sulfur have a great impediment to the nitrogen absorption of molten steel