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Studies of new coating materials to prevent clogging of the submerged entry nozzle (SEN) during continuous casting of Al-killed low carbon steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy. Högskolan Dalarna.ORCID iD: 0000-0001-6996-5001
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Högskolan Dalarna.
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2016 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812Article in journal (Refereed) Epub ahead of print
Abstract [en]

The possibility to reduce clogging in the submerged entry nozzle (SEN) when casting Alkilledlow carbon steel has been evaluated. The coating materials have been tested inlaboratory trials and pilot plant trials. Totally, 2 mixes of the coating material has been tested;containing 4.8 and 9.1 % CaTiO3 mixed with yttria stabilised zirconia (YSZ) powder. Thechemical composition was analysed by using an FEG-SEM equipped with EDS.The major result showed that alumina reacted with CaTiO3 in the temperature interval from1550-1600°C. In addition, the clogging ratio showed a decreased clogging tendency forcoated nozzles compared to standard nozzles. Also, the results showed that an approximatelythree times higher steel mass could be teemed through the coated nozzles before cloggingoccurred compared to trials with uncoated standard nozzles. Overall, it is concluded thatplasma sprayed CaTiO3 coatings can reduce the clogging tendency during the continuouscasting process.

Place, publisher, year, edition, pages
Taylor & Francis, 2016.
Keyword [en]
Clogging, Submerged entry nozzle, Pilot plant trials, Al-killed steel, Calcium titanate, Coating, Plasma spraying
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-185230DOI: 10.1179/1743281215Y.0000000065ISI: 000396713200005Scopus ID: 2-s2.0-84978477102OAI: oai:DiVA.org:kth-185230DiVA: diva2:919538
Projects
Förbättrad processteknik vid stränggjutning av stål speciellt känsliga för igensättning
Funder
VINNOVA, TO2352 JK
Note

QC 201611123

Available from: 2016-04-14 Created: 2016-04-14 Last updated: 2017-03-31Bibliographically approved
In thesis
1. An Experimental Study to Improve the Casting Performance of Steel Grades Sensitive for Clogging
Open this publication in new window or tab >>An Experimental Study to Improve the Casting Performance of Steel Grades Sensitive for Clogging
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this study, the goal is to optimize the process and to reduce the clogging tendency during the continuous casting process. The focus is on clogging when the refractory base material (RBM) in the SEN is in contact with the liquid steel. It is difficult or impossible to avoid non-metallic inclusions in the liquid steel, but by a selection of a good RBM in the SEN clogging can be reduced.

 

Different process steps were evaluated during the casting process in order to reduce the clogging tendency. First, the preheating of the SEN was studied. The results showed that the SEN can be decarburized during the preheating process. In addition, decarburization of SEN causes a larger risk for clogging. Two types of plasma coatings were implemented to protect the RBM, to prevent reactions with the RBM, and to reduce the clogging tendency. Calcium titanate (CaTiO3) mixed with yttria stabilized zirconia (YSZ) plasma coatings were tested in laboratory and pilot plant trials, for casting of aluminium-killed low-carbon steels. For casting of cerium alloyed stainless steels, YSZ plasma coatings were tested in laboratory, pilot plant and industrial trials. The results showed that the clogging tendency was reduced when implementing both coating materials.

 

It is also of importance to produce clean steel in order to reduce clogging. Therefore, the steel cleanliness in the tundish was studied experimentally. The result showed that inclusions originated from the slag, deoxidation products and tundish refractory and that they were present in the tundish as well as in the final steel product.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 60 p.
Keyword
Preheating, Decarburization, RBM, Clogging, SEN, Plasma sprayed coating, CaTiO3, YSZ, Continuous casting, Pilot plant trials, Industrial plant trials, Clean steel, Tundish, Non-metallic inclusions, MISS
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-202539 (URN)978-91-7729-275-3 (ISBN)
Public defence
2017-03-28, Kollegiesalen, KTH, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
VINNOVA
Funder
VINNOVA, Jernkontoret TO23
Note

QC 20170227

Available from: 2017-02-28 Created: 2017-02-26 Last updated: 2017-02-28Bibliographically approved

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