Interaction of alumina inclusions in steel with calcium-containing materials |
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| Authors: | Robert B Tuttle Jeffrey D Smith Kent D Peaslee |
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| Affiliation: | (1) the Department of Mechanical Engineering, Saginaw, Valley State University, 48710 Saginaw, MI;(2) the Department of Materials Science and Engineering, University of Missouri-Rolla, 65409 Rolla, MO |
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| 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. |
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