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Laboratorial Analysis of Inclusions Formed by Reoxidation in Tundish Steelmaking
Author(s) -
Alves Pedro Cunha,
Pereira Julio Aníbal Morales,
da Rocha Vinicius Cardoso,
Bielefeldt Wagner Viana,
Vilela Antônio Cezar Faria
Publication year - 2018
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201800248
Subject(s) - tundish , steelmaking , metallurgy , materials science , aluminate , slag (welding) , crucible (geodemography) , continuous casting , inclusion (mineral) , mass fraction , mineralogy , composite material , chemistry , cement , computational chemistry
In order to investigate the formation of inclusions by reoxidation in the tundish, an MgO–CaO gunning mass (GM1), an MgO gunning mass (GM2), a calcium aluminate tundish slag (TS), and a rice husk ash (RHA) silica based are evaluated. The interaction between the steel and these materials is analyzed under laboratory conditions. The experimental results for the chemical composition of steel and the types of inclusions formed satisfactory reach the thermodynamic equilibrium calculated by FactSage. GM1 presents better results for inclusion density and average size of inclusions compared to GM2. The experiment with TS presents a good steel cleanliness despite the formation of numerous alumina inclusions, caused by the reaction between the slag and the alumina crucible. The addition of RHA increases the inclusion density and average size of inclusions, and also the formation of CaO–Al 2 O 3 –SiO 2 oxides inclusions is favored. RHA has harmful effects concerning reoxidation events, deteriorating the good cleanliness obtained with the TS. The experiments with GM1 and TS are less reoxidative and presents a better steel cleanliness. Thus, the usage of this gunning mass and a calcium aluminate slag without RHA is preferable in order to diminish reoxidation during the tundish steelmaking.