Investigation of non-uniform slag films and air gap during slab continuous casting

Abstract

Based on an inverse algorithm and a full-scale heat transfer model of slab/mould, the non-uniform temperature fields of mould and slab are obtained. Considering the formation mechanism and heat transfer characteristics of the slag films and air gap, a mathematical model of the heat transfer between the liquid/solid slag films and air gap is further developed. According to the model, the non-uniform distributions and evolution of liquid/solid slag films and air gap are comprehensively revealed, which proposes a theoretical foundation for exploring the complex heat transfer of mould/slab and provides a helpful tool for further improving the casting parameters and operations.

Review of Testing Methods on the Heat Transfer Characteristics of Mold Slag Film

“…The liquid slag typically disappears at a location of 300-450 mm below the meniscus as it infiltrates into the air gap. [69][70][71] The temperature and cooling rate of the slag film constantly change along its movement direction, representing a continuous nonsteady process. Particularly, there are more complex variations in temperature and cooling rate of the slag film at the meniscus region.…”

“…Nevertheless, accurately determining the cooling rate of the slag film in a mold poses challenges due to the intricate thermal-physical state and nonuniform distributions, both longitudinally and circumferentially, of the slag film and the air gap. [69][70][71] Thus, the cooling rate of the slag film has often been disregarded in previous studies focused on the heat transfer of the slag film.…”