NDLI: Formation mechanism and control of MgO·Al$_{2}$O$_{3}$ inclusions in non-oriented silicon steel

Content Provider	Springer Nature Link
Author	Sun, Yan hui Zeng, Ya nan Xu, Rui Cai, Kai ke
Copyright Year	2014
Abstract	On the basis of the practical production of non-oriented silicon steel, the formation of MgO·Al$_{2}$O$_{3}$ inclusions was analyzed in the process of “basic oxygen furnace (BOF) → RH → compact strip production (CSP)”. The thermodynamic and kinetic conditions of the formation of MgO·Al$_{2}$O$_{3}$ inclusions were discussed, and the behavior of slag entrapment in molten steel during RH refining was simulated by computational fluid dynamics (CFD) software. The results showed that the MgO/Al$_{2}$O$_{3}$ mass ratio was in the range from 0.005 to 0.017 and that MgO·Al$_{2}$O$_{3}$ inclusions were not observed before the RH refining process. In contrast, the MgO/Al$_{2}$O$_{3}$ mass ratio was in the range from 0.30 to 0.50, and the percentage of MgO·Al$_{2}$O$_{3}$ spinel inclusions reached 58.4% of the total inclusions after the RH refining process. The compositions of the slag were similar to those of the inclusions; furthermore, the critical velocity of slag entrapment was calculated to be 0.45 m·s$^{−1}$ at an argon flow rate of 698 L·min$^{−1}$, as simulated using CFD software. When the test steel was in equilibrium with the slag, [Mg] was 0.00024wt%–0.00028wt% and [Al]s was 0.31wt%–0.37wt%; these concentrations were theoretically calculated to fall within the MgO·Al$_{2}$O$_{3}$ formation zone, thereby leading to the formation of MgO·Al$_{2}$O$_{3}$ inclusions in the steel. Thus, the formation of MgO·Al$_{2}$O$_{3}$ inclusions would be inhibited by reducing the quantity of slag entrapment, controlling the roughing slag during casting, and controlling the composition of the slag and the MgO content in the ladle refractory.
Starting Page	1068
Ending Page	1076
Page Count	9
File Format	PDF
ISSN	16744799
Journal	International Journal of Minerals, Metallurgy, and Materials
Volume Number	21
Issue Number	11
e-ISSN	1869103X
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2014-11-12
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	silicon steel steelmaking inclusions deoxidation slag entrapment thermodynamics kinetics Materials Science Metallic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Geochemistry and Petrology Mechanical Engineering

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