LF炉精炼AISI410不锈钢吹氮合金化研究

Study on Alloying by Nitrogen Blowing During AISI410 Stainless Steel Refining with LF

研究了40 t LF炉精炼AISI410不锈钢时,在常压下吹氮气增氮工艺(吹氮流量、吹氮时间及钢液温度)对AISI410不锈钢氮含量的影响,建立了AISI410不锈钢氮溶解度热力学计算模型。结果表明:钢中氮含量随着吹氮时间、氮气流量的增加而增大;常压下吹氮10 min,钢液含氮量可达到0.05%;随着氮流量增加钢液达到饱和的时间缩短,氮的溶解度随着钢液温度的降低而升高。应用热力学模型进行了分析,不同吹氮条件下氮溶解度实测值与热力学模型计算值较吻合。为LF炉精炼含氮不锈钢控制氮含量提供了理论依据。

The effects of nitrogen blowing time, nitrogen flow rate and liquid steel temperature under normal atmospheric condition on nitrogen content were tested and studied during AISI410 stainless steel refining with the 40 t LF and the control model of nitrogen alloying during LF refining was established. The experimental results show that with inerease in nitrogen blowing time and nitrogen flow rate, the nitrogen content in liquid steel increased ; the nitrogen content in liquid steel was more than 0.05% in the ease of nitrogen blowing for 10 min under normal atmosphere; with increase in nitrogen flow rate, the time for saturation of nitrogen in liquid steel was shortened and with decrease in liquid steel temperature, the solubility of nitrogen increased. The analysis on nitrogen solubility was carried out by thermodynamic model and the nitrogen content so calculated agrees quite well with the measured one, which provides reference for controlling nitrogen content by blowing nitrogen gas during stainless steel refining with LF.