Q Bop
Modified Basic Oxygen Furnace in which the oxygen and other gases are blown in from the bottom, rather than from the top. While the Q BOP stirs the metal bath more vigorously, allowing for faster processing, the design produces essentially the same steel grades as the top blowing basic oxygen furnace. Today's state of the art furnace design combines the previous technologies: 60% of the oxygen is blown from above, with the rest blown through the bottom of the vessel.
