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Key Lubrication Concepts to Understand the Role of Flow, Heat Transfer and Solidification for Modelling Defect Formation during Continuous Casting
Swerea MEFOS, Proc Met Dept, Casting & Flow Simulat Grp, Aronstorpsvagen 1, SE-97437 Lulea, Sweden..
Swerea MEFOS, Proc Met Dept, Casting & Flow Simulat Grp, Aronstorpsvagen 1, SE-97437 Lulea, Sweden.;KTH Royal Inst Technol, Dept Mat Sci & Engn, Brinellvagen 23, S-10044 Stockholm, Sweden..
Swerea MEFOS, Proc Met Dept, Casting & Flow Simulat Grp, Aronstorpsvagen 1, SE-97437 Lulea, Sweden..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2018 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 58, no 2, p. 201-210Article, review/survey (Refereed) Published
Abstract [en]

Surface defects are recurrent problems during Continuous Casting of steel due to the introduction of new grades that are often difficult to cast, as well as the everlasting pursuit for higher quality and improved yield. Accordingly, numerical modelling has become a ubiquitous tool to analyse the formation mechanisms of such defects. However, industrial application of simulations is often hampered by oversimplifications and omissions of important process details such as variations in material properties, specific casting practices or shortcomings regarding fundamental metallurgical concepts. The present manuscript seeks to create awareness on these issues by visiting key notions such as slag infiltration, interfacial resistance and Lubrication Index. This is done from a conceptual point of view based on industrial observations and numerical modelling experiences. The latter allows a re-formulation of outdated concepts and misconceptions regarding the influence of fluid flow, heat transfer and solidification on lubrication and defect formation. Additionally, the manuscript addresses common challenges and constraints that occur during industrial implementation of numerical models such as the lack of high -temperature material data for slags. Finally, the manuscript provides examples of improvements on product quality and process stability that can be achieved through a holistic approach which combines modelling with laboratory tests, experiences from operators and direct plant measurements.

Place, publisher, year, edition, pages
IRON STEEL INST JAPAN KEIDANREN KAIKAN , 2018. Vol. 58, no 2, p. 201-210
Keywords [en]
numerical modelling, Continuous Casting, defects, lubrication, powder consumption
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-225327DOI: 10.2355/isijinternational.ISIJINT-2017-482ISI: 000426225900001Scopus ID: 2-s2.0-85042685285OAI: oai:DiVA.org:kth-225327DiVA, id: diva2:1195107
Note

QC 20180404

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-04-04Bibliographically approved

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