OK, so back in the day, blast furnaces were used to refine the iron ore? Iron ore concentrate is mechanically and magnetically refined ore ? Refining usually happens at mines, or somewhere around there. Ore concentrate goes to blast furnace and then you get pig iron. Why not steel? I don't understand why converter steelmaking must be used (basic oxygen process) to make steel. Why not steel out of blast furnace? Or pure iron (let's say almost pure iron something like 99.90%) I'm kind of baffled by this What exactly is so brilliant about the basic oxygen process converter? I should ask, what is the brilliance behind the principle. I can understand that you can quickly make steel but... Blast furnace uses oxygen... Converter uses oxygen, why not steel out from blast furnace?