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Implementation of an YSZ coating material to prevent clogging of the submerged entry nozzle (SEN) during continuous casting of Ce-treated steels
Dalarna University, School of Technology and Business Studies, Materials Technology.ORCID iD: 0000-0001-6996-5001
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2016 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, 1-9 p.Article in journal (Other academic) Epub ahead of print
Abstract [en]

The possibility to reduce clogging in the submerged entry nozzle (SEN) during continuous casting of Ce alloyed stainless steels has been studied. This was done by implementing a new plasma coating material, consisting of yttria stabilized zirconia (YSZ). The coating was first tested in pilot-plant trials; where the amount of steel teemed through the plasma coated nozzles was monitored. Thereafter, samples of the coatings from the nozzles were studied using a FEG-SEM equipped with EDS. In addition, the coating material was tested in industrial trials where the performance was judged with respect to the clogging tendency detected as the movement of the stopper rod. The results from both the pilot-plant trials and industrial trials showed that the use of an YSZ coating led to a decreased clogging tendency during the casting in comparison to when using an uncoated SEN. Specifically, the pilot-plant trials showed that the clogging factor was lowered when implementing the YSZ coatings. Furthermore, the industrial trials showed that the clogging tendency, measured by the stopper rod movements, were lower when implementing the YSZ coating.

Place, publisher, year, edition, pages
2016. 1-9 p.
Keyword [en]
Continuous casting, Clogging, Rare earth metals, Submerged entry nozzle, New coating material, Plasma coating, Yttria stabilised zirconia, Stainless steel, Pilot-plant trials, Industrial plant trials
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-23393DOI: 10.1080/03019233.2016.1245916OAI: oai:DiVA.org:du-23393DiVA: diva2:1047280
Projects
JERNKONTORETS FORSKNING, Delrapport från pilotförsök och industriförsök med ZrO2-belagda dysor och gjutrör genomförda hos ComdiCast AB respektive Outokumpu Stainless AB, Förbättrad processteknik vid stränggjutning av stål speciellt känsliga för igensättningar, Kommitté JK 23052
Funder
VINNOVA, Kommitté JK 23052
Available from: 2016-11-17 Created: 2016-11-17 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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