85 t VOD精炼超纯铁素体不锈钢的脱氮工艺及效果

分析了85 t VOD精炼时相关工艺参数对超纯铁素体不锈钢00Cr18Mo2和00Cr17Mo终点氮含量的影响。结果表明,随初始碳含量增加,初始氮含量降低,钢水温度提高,适当增加脱氮时间,VOD钢水终点氮含量降低;当控制钢水初始碳含量0.4%～0.9%、处理温度≥1 590℃、真空度≤70 Pa、脱氮时间15～20 min、吹氩搅拌强度8～15 L/(min·t)、初始氮含量≤0.017 0%,VOD终点钢水氮含量为0.006 4%～0.009 5%。

Denitriding Process for Ultra-pure Ferrite Stainless Steel in 85t VOD Refining and Its Effect

Effect of relative process parameters of an 85 t VOD refining unit on end nitrogen content in ultra-pure ferrite stainless steel 00Crl8Mo2 and 00Crl7Mo is analyzed. Results show that with increasing initial carbon content, decreasing initial nitrogen content, increasing temperature of liquid steel and properly increasing denitriding time, the end nitrogen in liquid steel decreases； and with controlling initial carbon content in liquid steel- 0. 4% ~0. 9% , treading temperature ≥ 1590 °C , vacuum ≤70 Pa, denitriding time 15 ?20 min, blowing argon rate for stirring 8 ~ 15 L/(min ? t) and initial nitrogen content in liquid steel ≤0.017 0% , the end nitrogen content in liquid steel is 0. 006 4% ~ 0.009 5% .