ABSTRACT
With reference to Chapter 5, better cleanliness and removal of deoxidation products can be achieved if the following points are kept in mind:
1. Carryover slag from the furnace into the ladle does not directly cause “dirtiness” in steel. However, it should be deoxidized well. Otherwise, FeO and MnO, and to some extent SiO
present in it, will keep transferring oxygen into the melt. It is especially serious for aluminum-killed grades for the continuous casting route. Besides lowering aluminum yield, the slag also requires the addition of CaO and CaF
for proper
desulfurization
(see Chapter 7). Hence, in modern steelmaking practice, as much attention as possible is paid toward the prevention of slag carryover.
