Abstract: With the continuous improvement of the service life of the continuous casting tundish,
the requirements for the service life of the down nozzle of the tundish are also increasing. The
quick-change submerged entry nozzle can achieve continuous pouring and quick replacement of
the nozzle，and it is widely used due to its convenience and low production costs. However, when
replacing the nozzle，skulling is prone to occurrence between the upper and lower plates，leading
to oxygen absorption on the nozzle plate surface, oxidation of the liquid steel，and even serious
breakout accidents caused by the penetration of liquid steel from the plate surface. The paper
specifically analyzes the reasons for the skulling on the surface of the submerged entry nozzle and
proposes specific solutions，which have achieved good results through practical applications.

Key words: Submerged entry nozzle, Plate surface skulling, Reason, Measure