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Metallurgical and Materials Transactions B
Erschienen in: Metallurgical and Materials Transactions B 2/2015

01.04.2015

Morphology Control for Al2O3 Inclusion Without Ca Treatment in High-Aluminum Steel

verfasst von: Shengping He, Gujun Chen, Yintao Guo, Boyi Shen, Qian Wang

Erschienen in: Metallurgical and Materials Transactions B | Ausgabe 2/2015

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Abstract

Nozzle blockage is a major problem during continuous casting of Al-containing steel. Herein, we analyzed the thermodynamic equilibrium behavior between aluminum and oxygen in steel at 1873 K (1600 °C) and demonstrated that, the dissolved [O] initially decreases with increasing the dissolved [Al] until approximately 0.1 wt pct [Al], and after that, the dissolved [O] increases with dissolved [Al]. Thus, for high-aluminum steel with 1.0 wt pct dissolved [Al], the precipitation of Al2O3 inclusion can be avoided during cooling from deoxidation temperature to the liquidus temperature, if the actual dissolved [O] can be kept from increasing when the dissolved [Al] further increases from 0.1 to 1.0 wt pct. Hence, a method of inclusion control for high-aluminum steel without traditional Ca treatment technology was proposed based on the thermodynamic analysis. Industrial tests confirmed that low-melting point Ca-aluminate inclusions were observed typically through a slag washing with SiO2-minimized high-basicity slag during tapping, accompanied by two-step Al-adding process for production of high-aluminum steel. Moreover, there was no nozzle clogging occurred for five heats of continuous casting.
Vorheriger Artikel Viscosity Measurements of SiO2-“FeO”-CaO System in Equilibrium with Metallic Fe
Nächster Artikel Thermodynamic Activities and Distributions of Calcium and Magnesium Between Silicon and CaO-MgO-SiO2 Slags at 1873 K (1600 °C)

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Metadaten
Titel
Morphology Control for Al2O3 Inclusion Without Ca Treatment in High-Aluminum Steel
verfasst von
Shengping He
Gujun Chen
Yintao Guo
Boyi Shen
Qian Wang
Publikationsdatum
01.04.2015
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions B / Ausgabe 2/2015
Print ISSN: 1073-5615
Elektronische ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-014-0264-z

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