2021 Nashville AISTech

Characteristics and Thermodynamics of Nozzle Clogging in Ti-Stabilized Ultra-Pure Stainless Steels (Room Virtual)

29 Jun 21
4:00 PM - 4:30 PM

Tracks: Virtual Program - Metallurgy

Speaker(s): Yanhui Sun, University of Science and Technology Beijing; Zirong Zhao, University of Science and Technology Beijing; Xiaoshuai Hao, University of Science and Technology Beijing; Xuefeng Bai, Postdoctoral Fellow, University of Science and Technology Beijing

Characteristics of the deposits on the submerged entry nozzle wall in Ti-stabilized ultrapure stainless steels were investigated by cross-sectional and acid dissolution methods. The deposit profile could be divided into three major layers: eroded refractory, initial adhesive layer and loose multi-phase deposits. The initial adhesive layer comprised two sublayers: (i) the Al2O3–ZrO2 composite layer and (ii) the dense Al2O3-based deposit layer. The loose multi-phase deposits were composed mainly of MgO·Al2O3, CaO·Al2O3 and CaO·TiO2. Furthermore, the phase stability diagrams in high-Cr steels and equilibrium precipitations of inclusions during solidification were calculated to study the formation of deposits in the clogging.