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Post-mortem Studies of Submerged Entry Nozzles (SEN) Coated with Yttria Stabilized Zirconia (YSZ)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy. Department of Materials Science, Dalarna University. (Department of Materials Science and Engineering, KTH)ORCID iD: 0000-0001-6996-5001
Department of Materials Science, Dalarna University.
Outokumpu, Avesta SE-774 22, Sweden.
Sandvik Materials Technology, Sandviken SE-811 81, Sweden.
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2015 (English)In: The 6th International Congress on the Science and Technology of Steelmaking, Continuous Casting, Beijing, China, 12-14 May, 2015., 2015, Vol. 1, 469-472 p.Conference paper (Refereed)
Abstract [en]

During continuous casting of Ce-treated stainless steel grades an accumulation of inclusions at the submerged entry nozzle’s (SEN) internal wall can cause disturbances or even prevent the molten steel flow. Plasma sprayed yttria stabilized zirconia (YSZ) coating of the SEN’s inlet and stopper rod have been implemented in order to decrease the clogging effect. The coating thickness was 210 µm and the plant trials were conducted during continuous casting of slabs. The clogging tendency was measured by the stopper rod position during the casting process. The results of the measured positions were then compared to experimentally determined information from samples cut out from the SEN’s inlet after casting. Specifically, the samples were analysed using a field emission gun scanning electron microscope (FEG-SEM) equipped with an energy dispersive X-ray spectrometry (EDS). Sample with the dimensions of ̴15x10x5 mm were electrolytic extracted before analysis. The chemical composition at the interface between the solidified steel and refractory base materials were analysed, and traces of the YSZ coating were determined.

The movement of the stopper position indicated that the clogging tendency was reduced for the coated SEN. However, the FEG-SEM analyses showed that clogging of the SEN had occurred during the casting.

Place, publisher, year, edition, pages
2015. Vol. 1, 469-472 p.
Keyword [en]
post-mortem, plasma sprayed coating, yttria stabilised zirconia, rare earth metals, clogging, submerged entry nozzle, continuous casting
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
URN: urn:nbn:se:kth:diva-178014ISBN: 978-7-111-50125-1OAI: diva2:875811
The 6th International Congress on the Science and Technology of Steelmaking (ISC2015)
VINNOVA, TO23 - Jernkontoret

Förstaförfattaren är anställd i Stålindustrins forskarskola med finansiering från Region Dalarna, Region Gävleborg, Länsstyrelsen Gävleborg, Sandvikens kommun, Jernkontoret och Högskolan Dalarna.

Available from: 2015-12-02 Created: 2015-12-02 Last updated: 2016-04-14Bibliographically approved

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