后搅工艺在100t转炉中的应用

Application of post-stirring process in 100 t converter

介绍了后搅工艺在100 t复吹转炉中的应用,当一次倒炉钢水w(P)<0.040%时,通过单纯后搅或后搅的同时添加少量矿石,后搅时间120～150 s,钢水w(P)能稳定控制在0.020%以下,平均脱碳质量分数为0.01%,LP提高46.8。单纯后搅和后搅同时添加矿石,钢水温降分别为10.2和31.4℃。试验表明,后搅时间达到120 s后,脱磷速度、温降趋于定值,合理的后搅时间是120～150 s。

The present paper introduces the post-stirring process in 100 t converter. Practice shows that when w（P） in the hot metal is less than 0. 040 % in a single tapping the w（P） in the hot metal can be constantly controlled in the limit of less than 0. 020 %, the quality fraction of average decarburization maintains at 0. 01% and Lp improved by 46. 8 by adoption of post-stirring exclusively or post-stirring plus addition of small a- mount of ore for 120 to 150 s. Temperature drop of the hot metal is 10. 2 and 31.4℃ by post-stirring exclusively and post-stirring plus addition of ore. Tests show that the de- phosporization speed and temperature drop tend to maintain at a fixed value as soon as the post-stirring time reaches 120 s and therefore the appropriate post-stirring time shall be 120 to 150 s.