NITROGEN ALLOYING OF LIQUID-CRYSTAL BY GAS INJECTION IN THE LADLE ANDOR CONVERTER/

Trials of nitrogen alloying of liquid steel by bottom nitrogen-gas inj ection during the post-blow stir in the converter, and in the steel la dle at atmospheric pressure and under vacuum were performed in the ste el plant of the AG der Dillinger Huttenwerke. A unified model, valid f or both converter and steel ladle was developed to describe nitrogen p ickup in liquid steel by gas injection, By a tailored nitrogen stirrin g in the converter and/or ladle, it is possible to reach an aimed nitr ogen range with good accuracy.