The influence of tundish heating and purging on inclusion formation
AUTOR(ES)
Souza Junior, Jayme Alves de, Vieira, Estéfano Aparecido, Grillo, Felipe Fardin, Oliveira, Jose Roberto de
FONTE
Rem: Rev. Esc. Minas
DATA DE PUBLICAÇÃO
2015-09
RESUMO
Steel with high cleanliness requirements require an accurate control of the non-metallic inclusions, such as its quantity, morphology, chemical composition and size distribution. The continuous casting tundish has a fundamental role in steel cleanliness, avoiding its reoxidation by air and ladle slag that retain inclusions, as well as aiding the removal of those same inclusions along the continuous casting (Sahai, 2008). To perform the study, IF steel samples were collected in RH at the start, in the middle and at the end of the continuous casting of the tundish's first heat in three different conditions of tundish processing, alternating between heating and purging. These samples had their inclusions characterized by MEV/EDS using the ASCAT (Automated Steel Cleanliness Analysis Tool) technology. The results showed that more than 90% of the oxide inclusions generated in that type of steel are Al2O3 and AlTi. It was also observed that there is an increase of steel inclusions originating from RH in the tundish and that area fraction and average inclusionary density decreases along the continuous casting in two of the processing conditions.
Documentos Relacionados
- Physical and mathematical modeling of inclusion behavior in a tundish with gas curtain
- Comparative study of inclusion removal from liquid steel in the RH and argon purging processes
- Influence of handling and heating cycle on the morphology and flexural strength of glass-infiltrated alumina bars
- Influence of thermophoresis and joule heating on the radiative flow of jeffrey fluid with mixed convection
- Influence of egg pre-storage heating period and storage length on incubation results