Determination of inclusions in liquid steel after calcium treatment |
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| Authors: | Kabamba Tshilombo |
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| Institution: | (1) Department of Materials Science and Engineering, Center for Iron and Steelmaking Research, Carnegie Mellon University, Pittsburgh, PA 15213, USA;(2) formerly Visiting Researcher, Carnegie Mellon University, Pittsburgh, PA 15213, USA;(3) RJ Lee Group, Monroeville, PA 15146, USA;(4) Present address: Aalto University, FI-00076 Aalto, Finland;(5) Department of Process Technology—Steelmaking and Casting, United States Steel Corporation Research and Technology Center, Munhall, PA 15120, USA; |
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| Abstract: | Nozzle blocking was eliminated by calcium-treated liquid steel through changing the chemical and phase composition of alumina
inclusions in aluminium-killed steel. Three different methods were applied to determine the composition of inclusions in liquid
steel: total oxygen content samples, sampling spoon samples, and “lollipop” steel samples. The results show that calcium modification
of liquid steel influences the inclusion composition varying from 2wt% to 14wt% depending on the method used. The composition
of inclusions contains mainly Al2O3-CaO only, or is associated with SiO2 or MgO depending on the initial input. The methods used in this study are indicators of the inclusion composition but can
be improved to quantify the inclusion size. |
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