Title

Lime-based Plasma Spray Coatings on Steelmaking Nozzles

Abstract

During continuous casting of aluminum-killed steels, alumina accretions frequently form on the refractory nozzle wall obstructing the flow of steel. Accretions are typically composed of small micron sized alumina particles that attach to the nozzle wall and form a powdery friable alumina layer. Researchers report that the alumina densifies at the nozzle interface resulting in a dense alumina layer between the powdery layer and the nozzle refractory (see Figure 1 for a typical accretion structure)(1). In some cases, portions of the accretion layer detach and enter the steel stream, which can degrade steel quality. In other cases, the accretion grows throughout the casting sequence, decreasing the flowrate until eventually the nozzle must be replaced.

Department(s)

Materials Science and Engineering

Sponsor(s)

American Iron and Steel Institute
United States. Department of Energy

Keywords and Phrases

Aluminum; Lime Plasma Coating

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 ASM International, All rights reserved.

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