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为了控制试验钢中TiN夹杂的析出,对TiN生成反应进行了热力学分析。结果表明,钢液在液相线温度以上不会自发生成TiN夹杂,在钢液凝固过程中,由于Ti、N元素在凝固前沿的富集,使得TiN夹杂的生成反应得以进行。在实际生产当中,为了减少TiN夹杂在两相区内的析出,应在控制钢中Ti、N含量的基础上,再适当加强连铸二冷速率,使钢液快速通过两相区(1 728～1 878 K)。同时,根据Scheil方程计算得到,试验钢在凝固过程中不析出TiN夹杂的条件为将钢中的钛氮浓度积控制在7.04×10-5以下。
In order to control the precipitation of TiN inclusions in the test steel, the thermodynamic analysis of TiN formation reaction was carried out. The results show that the molten steel does not spontaneously form TiN inclusions above the liquidus temperature. During the solidification of molten steel, TiN inclusions are formed due to the enrichment of Ti and N elements at the solidification front. In actual production, in order to reduce the precipitation of TiN inclusions in the two-phase zone, the secondary cooling rate of continuous casting should be further strengthened on the basis of Ti and N contents in the control steel so that the molten steel can rapidly pass through the two-phase zone (1 728 ~ 1 878 K). At the same time, calculated according to Scheil equation, the test steel in the solidification process does not precipitate TiN inclusions in the condition of the steel in the concentration of titanium and nitrogen controlled at 7.04 × 10-5 or less.