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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4146

Title: Magnesium: origin and role in calcium-treated inclusions
Authors: Pistorius, PC
Presoly, P
Tshilombo, G
Keywords: Steel making
Metallurgy
Calcium treatment
Magnesium
Spinel
Microanalysis
Calcium wire
Aluminium
Metals
Issue Date: Aug-2009
Citation: Pistorius, PC, Presoly, P, and Tshilombo, G. 2009. Magnesium: origin and role in calcium-treated inclusions. SOHN International Symposium, Advanced Processing of Metals and Materials: Principles, Technologies and Industrial Practice, Catamaran Resort San Diego, California, USA, pp 373-378
Abstract: Steel was sampled after calcium treatment at an industrial steel plant, and the inclusions identified by energy-dispersive X-ray microanalysis (EDX) on polished sections of the samples analysing the samples in a scanning electron microscope. The predicted fraction liquid in the inclusion was estimated from the ternary alumina-magnesia-lime phase diagram. Inclusions with higher CaO contents generally had lower MgO contents, indicating that the calcium wire is not the origin of the magnesium in the inclusions; this was also confirmed by wet chemical analysis of the calcium wire. Instead, it appears that magnesium-alumina spinel inclusions form during extended ladle contact after aluminium killing and before calcium treatment. While such spinels have been stated to cause poor castability clogging the submerged-entry nozzle, it is clear that calcium treatment successfully modifies the spinel inclusions to mixed alumina-lime-magnesia inclusions, where the magnesia content contributes substantially to liquefaction of the inclusions: for typical MgO contents of around 10%, the range of Ca:O ratios which yield liquid or partially liquid inclusions is extended substantially to lower Ca:O ratios.
Description: SOHN International Symposium, Advanced Processing of Metals and Materials: Principles, Technologies and Industrial Practice, Catamaran Resort San Diego, California, USA
URI: http://hdl.handle.net/10204/4146
ISBN: 9780873396332
Appears in Collections:General science, engineering & technology

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