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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
Dalarna University, School of Technology and Business Studies, Materials Technology.ORCID iD: 0000-0001-6996-5001
Dalarna University, School of Technology and Business Studies, Materials Technology.
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2017 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 44, no 2, 117-127 p.Article in journal (Refereed) Published
Abstract [en]

The possibility to reduce clogging in the submerged entry nozzle (SEN) when casting Al killed low carbon steel has been evaluated. The coating materials have been tested in laboratory 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. The chemical composition was analysed by using an FEG-SEM equipped with EDS.The major result showed that alumina reacted with CaTiO3 in the temperature interval from 1550-1600°C. In addition, the clogging ratio showed a decreased clogging tendency for coated nozzles compared to standard nozzles. Also, the results showed that an approximately three times higher steel mass could be teemed through the coated nozzles before clogging occurred compared to trials with uncoated standard nozzles. Overall, it is concluded that plasma sprayed CaTiO3 coatings can reduce the clogging tendency during the continuous casting process.

Place, publisher, year, edition, pages
Maney Publishing, 2017. Vol. 44, no 2, 117-127 p.
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
Steel Forming and Surface Engineering, Studier angående bildningsmekanismer för igensättningar i gjutrör
Identifiers
URN: urn:nbn:se:du-21364DOI: 10.1179/1743281215Y.0000000065ISI: 000396713200005OAI: oai:DiVA.org:du-21364DiVA: diva2:919553
Projects
Förbättrad processteknik vid stränggjutning av stål speciellt känsliga för igensättning
Funder
VINNOVA, TO2352 JK
Note

Finansiering för färdigställande av artikel har erhållits från Stålindustrins forskarskola i sammarbete med SSAB i Oxelösund. 

Stålindustrins forskarskola: Huvudman och sammanhållande i arbetet är Högskolan Dalarna. Satsningen finansieras av Jernkontoret, Region Dalarna, Region Gävleborg, Länsstyrelsen Gävleborg, Högskolan Dalarna, Sandvikens kommun samt samverkande företag. Samarbeten har hittills etablerats med SSAB, Sandvik, Outokumpu, Böhler-Uddeholm, Åkers Sweden, Triple-Steelix och data M Scandinavia. Luleå Tekniska Universitet samt Högskolan i Gävle är viktiga akademipartners.

Available from: 2016-04-14 Created: 2016-04-14 Last updated: 2017-08-09Bibliographically 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
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-25727 (URN)978-91-7729-275-3 (ISBN)
Public defence
2017-03-28, Kollegiesalen, KTH, Brinellvägen 8, 10:00 (English)
Opponent
Supervisors
Projects
VINNOVA
Funder
VINNOVA, Jernkontoret TO23]
Available from: 2017-08-09 Created: 2017-08-09 Last updated: 2017-08-09Bibliographically approved

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