研究了攀钢新钢钒公司生产帘线钢72A过程中钢中氮含量变化对钢中TiN夹杂析出的影响。研究发现,随着钢中氮含量的升高,钢中析出的TiN夹杂数量变多,尺寸变大。热力学研究表明,在帘线钢中TiN一般只能在固相区形成,考虑元素偏析对凝固前沿元素富集的影响,凝固过程中TiN能在固液两相区析出。在帘线钢生产过程中,为了控制钢中TiN的析出,除了控制钛含量,控制钢中氮含量及氮偏析更加重要。理论计算结果表明,当钢中钛的质量分数控制在0.000 3%～0.000 5%区间时,将钢中氮的质量分数控制在0.001 7%～0.002 9%区间内能显著降低乃至杜绝帘线钢中TiN的析出。攀钢将帘线钢中钛、氮的质量分数分别控制在0.000 5%以下和0.002%以下,显著减少了钢中TiN的析出,个别炉次中没有发现尺寸大于2μm的TiN夹杂。 The effect of nitrogen content in steels of 72A produced by Panzhihua Iron and Steel Company on the precipitation of TiN in steel was studied. The study found that with the increase of nitrogen content in steel, TiN precipitated in the steel increased the number of inclusions, the size becomes larger. Thermodynamic studies show that TiN can only be formed in the solid phase in cord steel. The influence of elemental segregation on the element enrichment in the solidification front is considered. TiN precipitates in the solid-liquid two-phase region during solidification. In the process of cord steel production, in order to control TiN precipitation in steel, in addition to controlling the titanium content, it is more important to control the nitrogen content and nitrogen segregation in the steel. The theoretical calculation results show that when the mass fraction of titanium in steel is controlled in the range of 0.000 3% to 0.000 5%, the mass fraction of nitrogen in steel can be reduced or even eliminated in the range of 0.001 7% -0.002 9% TiN precipitation. In Pangang Steel, the content of titanium and nitrogen in the cord steel was controlled below 0.0005% and below 0.002%, respectively, which significantly reduced the precipitation of TiN in the steel. No TiN inclusions larger than 2μm in individual furnaces were found.