Effects of Fluorine and BaO on the Crystallization Behavior of Lime–Alumina-Based Mold Flux for Casting High-Al Steels

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 46; no. 2; pp. 852 - 862
• Main Authors: Lu, Boxun, Wang, Wanlin
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.04.2015; Springer Nature B.V
• Subjects: Casting; Characterization and Evaluation of Materials; Chemistry and Materials Science; Continuous casting; Crystallization; Fluorine; High strength steel; High strength steels; Iron and steel making; Materials Science; Metallic Materials; Metallurgy; Mold fluxes; Nanotechnology; Steels; Structural Materials; Surfaces and Interfaces; Thermocouples; Thin Films; Crystallization Behavior; Trip Steel; Fluorine Content; Fluorine; Mold Flux
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-014-0285-7

With the development of advanced high-strength steel, the slag/steel reaction problems introduced by the addition of aluminum into steel become a challenge for the continuous casting process. An investigation aims to improve the crystallization property of lime–alumina-based mold flux for casting high Al-bearing steels which was carried out through the study of effects of fluorine and BaO on the crystallization behaviors of the mold flux. The single/double hot thermocouple technique and SEM, EDS were employed in the study. The results indicated that the decrease of fluorine content would promote the crystallization behaviors in the lime–alumina-based system which is different to that in the conventional lime–silica-based system, while BaO substituted for CaO can inhibit the crystallization of the lime–alumina-based mold flux. Moreover, the crystallization behavior of mold flux under simulated thermal gradient was in well accordance with TTT results, including the crystallization process and three-layered (liquid, crystalline, glassy) distribution of mold flux.