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Studies of the decarburisation phenomena during preheating of submerged entry nozzles (SEN) in continuous casting processes
Dalarna University, School of Technology and Business Studies, Materials Technology. KTH.ORCID iD: 0000-0001-6996-5001
Dalarna University, School of Technology and Business Studies, Materials Technology. KTH.
KTH.
2017 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 44, no 2, 108-116 p.Article in journal (Refereed) Published
Abstract [en]

Decarburisation of the submerged entry nozzles (SEN) during the preheating process wasinvestigated based on plant trials and thermodynamic modelling at three different steel plants.During the trials the preheating processes were mapped, the temperature profiles wereregistered and post-mortem studies of the SENs with scanning electron microscopy wereperformed. Typically, the glass/silicon powder will form a dense and protective layer inside theSEN when heated over 1100°C. However, this study found that the temperature distributioninside the SEN did not always reach this critical temperature. Thus, decarburisation of the SENwas found at all steel plants. The overall results illustrate that the control of the preheatingprocess needs to be improved at all steel plants. It is suggested that future research should befocused on the development of new coating materials to prevent decarburisation of therefractory base material, which would decrease the chances of clogging during casting.

Place, publisher, year, edition, pages
Taylor & Francis, 2017. Vol. 44, no 2, 108-116 p.
Keyword [en]
Continuous casting, Industrial plant trials, Preheating, Decarburisation, Submerged entry nozzle
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-21260DOI: 10.1080/03019233.2016.1156900ISI: 000396713200004OAI: oai:DiVA.org:du-21260DiVA: diva2:913817
Conference
6th International Congress on the Science and Technology of Steelmaking, ICS 2015
Projects
Jernkontoret TO23052
Funder
VINNOVA
Note

Ingår i Jernkontorets forskning: Strategiskt stålforskningsprogram för Svergie 2007-2012. 

Projekttittel: Förbättrad processteknik vid stränggjutning av stål speciellt känsliga för ingensättning.

Available from: 2016-03-22 Created: 2016-03-21 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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Citation style
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