Thermodynamics and Kinetics of SEN Clogging during Continuous Casting of A1-killed Steels

Abstract

- SEN clogging samples and inclusions in steel samples from industrial trial were analyzed. Alumina-Based inclusions are the main reason for SEN clogging. Unsuitable calcium treatment may form solid calcium abominate inclusions; - Thermodynamic analysis is performed for the calcium treatment process to modify inclusions in the molten steel. the "liquid window" for inclusion modified has been built, providing sufficient information to control the formation of liquid inclusions during steel refuting. in order to modify all Al2O3 inclusions in the molten high strength alloy steel to C12A7, if [%A1] in steel is 0.0097%, [%Ca] in molten steel should be 0.00084% and [% S] should be < 0.019%. the suitable addition of calcium to generate C12A7 inclusions can be predicted by the current model; - Kinetic models for SEN clogging have been developed. in order to accurately predict the attachment of inclusions to nozzle wall, inclusions should be injected from the entire cross section of the nozzle. under the following conditions, inclusions are more easily to be entrapped to nozzle wall: smaller inclusion size, larger wall roughness, smaller casting speed (smaller bulk velocity and larger nozzle diameter). the number of heats that can be poured before the nozzle is fully clogged can be predicted by the current kinetic model.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Calcium treatment; Clogging; Inclusions; Modeling

International Standard Book Number (ISBN)

978-193511702-5

International Standard Serial Number (ISSN)

1551-6997

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Association for Iron and Steel Technology, All rights reserved.

Publication Date

19 Oct 2009

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