Suppressing Aluminum/Silica Exchange Reaction Between High Aluminum Steel and Mold Flux During Continuous Casting Process

Author

Kuanysh Nurbekuly Yermukhanbetov, Missouri University of Science and Technology

Keywords and Phrases

continuous casting; electromotive force; light-weight steel; mold flux; slag dopants

Abstract

"Mold flux plays one of the critical roles in continuous casting of steel. It performs five primary functions: thermal and chemical insulation, lubrication between the steel strand and mold, absorption of inclusions, and promotion of even heat flux. The aluminum/silica exchange reaction occurring between steel and mold flux during the continuous casting process poses significant challenges in the steel industry. This reaction can lead to various defects in the cast product and adversely affect its surface quality, as well as downstream processing.

In this work, effectiveness of two approaches, namely slag dopant additions and electrochemical techniques, in suppressing the exchange reaction between high aluminum steel and mold flux were investigated. Various slag dopants, including CaSO₄, SrSO₄, and SeS₂, were tested at concentrations of 0.5 wt.%, 1.0 wt.%, and 2.5 wt.%. The results demonstrated that all dopants tested slowed down the exchange reaction compared to the baseline condition. Among them, SrSO₄ and SeS₂ at a concentration of 0.5 wt.% exhibited slightly better suppression. However, increasing the dopant concentration above 1.0 wt.% did not further influence the reaction.

Moreover, the application of electrical potentials showed promising results in inhibiting the exchange reaction. Specifically, a voltage of 0.84 V and 1.0 V applied by steel electrode effectively suppressed the reaction, leading to increased aluminum content and decreased silicon content in the steel compared to the baseline condition"--Abstract, p. iii

Advisor(s)

Gu, Yijia
O'Malley, Ronald J.

Committee Member(s)

Smith, Jeffrey D.
Emdadi, Arezoo

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2023

Pagination

x, 63 pages

Note about bibliography

Includes bibliographical references (pages 60-62)

Rights

© 2023 Kuanysh Nurbekuly Yermukhanbetov, All Rights Reserved

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 12306

Electronic OCLC #

1427273640

Recommended Citation

Yermukhanbetov, Kuanysh Nurbekuly, "Suppressing Aluminum/Silica Exchange Reaction Between High Aluminum Steel and Mold Flux During Continuous Casting Process" (2023). Masters Theses. 8134.
https://scholarsmine.mst.edu/masters_theses/8134