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Inclusion Characterization of Titanium Stabilized Ultra Low Carbon Steels: Impact of Oxygen Activity before Deoxidation

At an ArcelorMittal steel‐producing plant, heats deoxidized with initial oxygen activity greater or equal to 750 ppm were automatically downgraded. After analyzing liquid steel samples using automated SEM and remelt button techniques, it was concluded that higher oxygen levels before killing do not necessarily correlate to an increase in inclusion content of the heats. Results from both automated scanning electron microscope (SEM) and remelt button technique showed that the frequency of inclusions decreases with increasing inclusion size regardless of oxygen levels. The cleanliness of the heats with temperature correction following deoxidation at the RH degasser was also determined. It was observed that the number density of inclusions significantly increased in the ladle samples and more than doubled in the tundish samples for the heats with late temperature correction at the degasser and, therefore, this practice should be controlled.