Abstract
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.
Highlights
The requirements for steel mechanical properties and chemical composition are in constant transformation with the growing demands for quality; at the same time, the cost, energy and environmental effect in production have become items of great concern
An experiment was developed on in Continuous Casting, through the an industrial scale at ArcelorMittal analysis of Al2O3 and AlTi inclusions Tubarão Steel Company, using the ac- generated in three different tundish tual productive process of Continuous processing conditions: a) with heat
The two majority inclusion groups presented in the samples and the focus of this work were Al2O3 and AlTi inclusions; Al2O3 inclusions occupied proportionally seven times more area than AlTi inclusions
Summary
The requirements for steel mechanical properties and chemical composition are in constant transformation with the growing demands for quality; at the same time, the cost, energy and environmental effect in production have become items of great concern. Steel properties such as mechanical resistance, malleability, durability and resistance to corrosion have improved over the years to meet such needs. An experiment was developed on in Continuous Casting, through the an industrial scale at ArcelorMittal analysis of Al2O3 and AlTi inclusions Tubarão Steel Company, using the ac- generated in three different tundish tual productive process of Continuous processing conditions: a) with heat-. Steel experiment result supplies a quantitative samples were collected in RH and at and qualitative description of inclusions the start, in the middle and end of the generated in the tundish's first heating, tundish's first heating of the casting.
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