本文探讨了转炉顶底复合吹炼过程中[N]的行为。指出熔池氮含量变化可以用一种半经验模型来描述。它由脱氮反应和吸氮反应两部分构成。模型计算表明,起初熔池[N]下降,达到最低值以后,[N]即逐渐上升。模型对这一时期[N]变化趋势的估计可以作为依据,来选择用Ar或其他非氮气体切换N_2的适时点。 This paper explores the behavior of [N] during BOF blowing. It is pointed out that the variation of nitrogen content in the weld pool can be described by a semi-empirical model. It consists of denitrification and nitrogen absorption reaction of two parts. The model calculation shows that [N] drops gradually at the beginning, and [N] gradually increases after reaching the lowest value. The estimation of the model [N] during this period can be used as a basis to select the proper point of switching N 2 with Ar or other non-nitrogen gas.