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Experimental Study of non-metallic inclusions behaviour in the Tundish during Continuous Casting of Steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy. Högskolan Dalarna.ORCID iD: 0000-0001-6996-5001
SSAB, Oxlösund.
SSAB, Oxelösund.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

The tundish has been experimentally mapped to study reactions between the molten steel and the cover powder as well as between the steel and the tundish lining. Steel samples were collected before casting, in the tundish during the casting process, and after casting. During sampling in the tundish the MISS sampler was used in order to make an in-depth study of two parallel positions of the steel/slag and steel/refractory interfaces. Thereafter, the samples were analysed with SEM in combination with EDS to determine the size and compositions of inclusions. The inclusion data were mapped in ternary phase diagrams to determine the origin of the inclusions. The results showed that two main inclusions groups, slag and deoxidation products, could be found in the samples. In addition, the samples contained inclusions that had been formed due to interactions with the refractory lining material. 

Keyword [en]
tundish, clean steel, continuous casting, industrial plant trials, slag/steel interface, refractory/steel interface, non-metallic inclusions
National Category
Metallurgy and Metallic Materials
Research subject
Metallurgical process science
Identifiers
URN: urn:nbn:se:kth:diva-202562OAI: oai:DiVA.org:kth-202562DiVA: diva2:1077505
Note

QC 20170228

Available from: 2017-02-27 Created: 2017-02-27 Last updated: 2017-02-28Bibliographically 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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Svensson, JennieKarasev, AndreyJönsson, Pär

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