Origin of Nonmetallic Inclusions in Ladle Transition part of Continuously Cast Slabs

Abstract

In the continuous casting process, it is important to reduce the off-quality portion due to ladle exchange or variation in process parameters. In the present study, experimental investigation and thermodynamic calculation has been carried out for analysis origin of non-metallic inclusions in ladle transition part of continuously cast slabs.
The following results are obtained.
(1) In the present study, entrapped nonmetallic inclusions in the transition part of ladle exchange slabs are mainly spherical inclusions (CaO-Al₂O₃).
(2) According to thermodynamic calculation, origin of spherical inclusions are mainly ladle slag and tundish slag.
(3) Applying thermodynamic calculation for the equilibrium between slag and molten steel is useful for analysis origin of nonmetallic inclusions in the continuously cast slabs.