OXYGEN STEEL MAKING PROCESS USING IRON MANGANESE ORE AS MN SOURCE

摘要

PURPOSE:To increase the Mn content of metal at the time of blowing out without using expensive ferroalloy by adding iron manganese ore in refining under a small amt. of slag to reduce MnO in the ore to Mn in molten steel. CONSTITUTION:A first process for supplying gaseous O or a solid O source such as mill scale sintered ore to hot iron to desiliconize it and a second process for dephosphorizing and decarburizing the desiliconized iron are separately carried out. In the second process, iron manganese ore is added to reduce the Mn source in the ore to Mn in molten steel. Thus, effective refining using a cheap Mn source can be carried out without using expensive ferromanganese.