BOF converter upgraded to KOBM converter by Primetals Technologies started up at HBIS Group in Handan

In early November, a KOBM converter, upgraded from a former BOF converter by Primetals Technologies, was started up in the steel plant of HBIS Group Handan Iron and Steel in Handan, China. Compared to a BOF converter, the combined blowing from top and bottom in a KOBM converter results in a better bath mixing and metallurgical reactions are closer to the equilibrium. In addition, lime injection ensures fast slag formation and excellent process and slopping control. Therefore, this process is expected to shorten the blowing process, to lower the carbon-oxygen equilibrium of the steel at tapping, improve the yield by lowering slag amount and iron oxide content in the slag, and to produce cleaner steel with minimum inclusions and impurities. The improved steel quality especially fits requirements from the automotive industry. Furthermore, the new converter has the potential to save ladle additions during tapping as well as costs for lime additions.