MANUFACTURE OF STEEL IN CONVERTER BY UTILIZING CARBONACEOUS MATERIAL FOR HEAT SOURCE

摘要

PURPOSE:To increase the extent of gasification and desulfurization by estimating the time when the potential of oxygen blown into a converter especially by top blowing at a temp. close to the ignition point becomes a specified range from the transition of decarburization or the occurrence of gasification and desulfurization corresponding to the potential and by adding a carbonaceous material for a heat source from the top of the converter at the time. CONSTITUTION:Operation is carried out in a low molten iron ratio in a converter provided with at least top oxygen blowing lance as a blowing means. In the operation, the time when the potential PO2 of oxygen blown into the conveter especially by top blowing at a temp. close to the ignition point becomes 10<-4>-10<-8> atm. is estimated from the transition of decarburization or the occurrence of degasification and desulfurization corresponding to the potential. A carbonaceous material for a heat source is added from the top of the converter at the time. Thus, steel can be manufactured while reducing the pickup of S.