Title

Interaction of Alumina Inclusions in Steel with Calcium-containing Materials

Abstract

Clogging of tundish and submerged entry nozzles (SENs) adversely impacts productivity and quality in the continuous casting of aluminum-killed steels. Clogging results from an accretion layer that develops on the inside surface of the nozzle and restricts steel flow. Current nozzle refractories often react with molten steel to form solid by products that promote clogging. Nozzle materials that are inert with the liquid steel or react with accretions to form liquid reaction products could inhibit or eliminate clogging. Static experiments were conducted to investigate the stability between calcium-based materials and aluminum-killed steel. The results indicate that both calcium titanate and calcium zirconate react with alumina to form calcium aluminates. However, only the reaction between alumina and calcium titanate yielded calcium aluminate chemistries that were molten at steel casting temperatures. Liquid reaction products are preferred since they would be removed from the nozzle by the steel flow, thereby preventing accretion formation and clogging.

Department(s)

Materials Science and Engineering

Sponsor(s)

American Iron and Steel Institute
United States. Department of Energy

Keywords and Phrases

Aluminum-Killed Steels; Clogging; Submerged Entry Nozzles; Tundish Entry Nozzles

Library of Congress Subject Headings

Continuous casting

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 Springer Verlag, All rights reserved.

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