Recyclate-containing magnesia-carbon refractories – Influence on the non-metallic inclusions in steel
Kirsten Moritz,
Florian Kerber,
Steffen Dudczig,
Gert Schmidt,
Thomas Schemmel,
Matthias Schwarz,
Helge Jansen,
Christos G. Aneziris
Affiliations
Kirsten Moritz
Technische Universität Bergakademie Freiberg, Institute of Ceramics, Refractories and Composite Materials, Agricolastr. 17, 09599, Freiberg, Germany; Corresponding author.
Florian Kerber
Technische Universität Bergakademie Freiberg, Institute of Ceramics, Refractories and Composite Materials, Agricolastr. 17, 09599, Freiberg, Germany
Steffen Dudczig
Technische Universität Bergakademie Freiberg, Institute of Ceramics, Refractories and Composite Materials, Agricolastr. 17, 09599, Freiberg, Germany
Gert Schmidt
Technische Universität Bergakademie Freiberg, Institute of Ceramics, Refractories and Composite Materials, Agricolastr. 17, 09599, Freiberg, Germany
Thomas Schemmel
Refratechnik Steel GmbH, Am Seestern 5, 40547, Düsseldorf, Germany
Matthias Schwarz
Deutsche Edelstahlwerke Specialty Steel GmbH & Co. KG, Obere Kaiserstr., 57078, Siegen, Germany
Helge Jansen
Refratechnik Steel GmbH, Am Seestern 5, 40547, Düsseldorf, Germany
Christos G. Aneziris
Technische Universität Bergakademie Freiberg, Institute of Ceramics, Refractories and Composite Materials, Agricolastr. 17, 09599, Freiberg, Germany
The fabrication of MgO–C refractories containing MgO–C recyclates is a current approach for saving resources and energy. However, it must be ensured that the steel quality is not adversely affected, particularly with regard to non-metallic inclusions. The present study investigates MgO–C refractories containing different proportions of MgO–C recyclates (up to 83%) in contact with 16MnCr5 steel melt and a slag. A recyclate-free MgO–C material served as a reference. The tests were performed in a steel-casting simulator. By an automated feature analysis of the solidified steel, manganese sulfide and complex alumina-manganese sulfide inclusions were found to be the predominant ones in all steel samples. No negative influence of the recyclate on the inclusion count and the size distribution of the inclusions, the latter being determined for the sum of alumina and alumina-manganese sulfide as well as for the manganese sulfide inclusions, was observed.
