Study of the deoxidation of steel with aluminum wire injection in a gas-stirred ladle

Citation
K. Beskow et al., Study of the deoxidation of steel with aluminum wire injection in a gas-stirred ladle, MET MAT T B, 32(2), 2001, pp. 319-328
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Metallurgy
Journal title
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
ISSN journal
1073-5615 → ACNP
Volume
32
Issue
2
Year of publication
2001
Pages
319 - 328
Database
ISI
SICI code
1073-5615(200104)32:2<319:SOTDOS>2.0.ZU;2-V
Abstract
In the present work, the deoxidation of liquid steel with aluminum wire inj ection in a gas-stirred ladle was studied by mathematical modeling using a computational fluid dynamics (CFD) approach. This was complemented by an in dustrial trial study conducted at Uddeholm Tooling AB (Hagfors, Sweden). Th e results of the industrial trials were found to be in accordance with the results of the model calculation. In order to study the aspect of nucleatio n of alumina, emphasis was given to the initial period of deoxidation, when aluminum wire was injected into the bath. The concentration distributions of aluminum and oxygen were calculated both by considering and not consider ing the chemical reaction. Both calculations revealed that the driving forc e for the nucleation of Al2O3 was very high in the region near the upper su rface of the bath and close to the wire injection. The estimated nucleation rate in the vicinity of the aluminum wire injection point was much higher than the recommended value for spontaneously homogeneous nucleation, 10(3) nuclei/(cm(3)/s). The results of the model calculation also showed that the alumina nuclei generated at the vicinity of the wire injection point are t ransported to other regions by the flow.