New Strategy for the Optimization of Mold Flux During Continuous Casting of High-Ti Steel

Severe reactions occur at the steel-slag interfaceSteel-slag interface during continuous casting of high-Ti steelHigh-Ti steel, leading to the interruption of smooth operation and strand defects. To settle the issue, this study proposed a new slag system with high basicity (the ratio of CaO/SiO2: 1.5–1.9), aiming to maintain the stability of slag properties by providing sufficient O2− ions from CaO. The main results indicate that as the basicity ranged from 0.8 to 1.5, the viscosityViscosity and melting temperature decreased first and then increased with the increase of TiO2/SiO2 ratio, and the precipitation transformed from glassy to high-melting temperature perovskite. In the range of 1.5 to 1.9, the melting and flow also deteriorated as the rise of TiO2/SiO2, but the extent of deterioration was greatly suppressed compared with that with low basicity, and no perovskite precipitated. This study could provide a new strategy to optimize the moldMold slag for high-Ti steelHigh-Ti steel continuous casting.