University of Oulu

Kodukula, S., Petäjäjärvi, M., Savolainen, J., Fabritius, T. and Porter, D. (2021), Influence of Calcium Treatment and Electromagnetic Stirring on Ridging in Dual‐Stabilized Ferritic Stainless Steels. steel research int., 92: 2000445. https://doi.org/10.1002/srin.202000445

Influence of calcium treatment and electromagnetic stirring on ridging in dual‐stabilized ferritic stainless steels

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Author: Kodukula, Suresh1; Petäjäjärvi, Marko2; Savolainen, Jari2;
Organizations: 1Tornio Research Center, Outokumpu Stainless Oy, Terästie 1, 95490 Tornio, Finland
2Steel Melting Shop Development, Outokumpu Stainless Oy, Terästie 1, 95490 Tornio, Finland
3Department of Process Metallurgy, Faculty of Technology, University of Oulu, 90014 Oulu, Finland
4Centre for Advanced Steels Research, Faculty of Technology, University of Oulu, 90014 Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2021042820715
Language: English
Published: John Wiley & Sons, 2021
Publish Date: 2021-10-28
Description:

Abstract

Titanium and niobium are added to ferritic stainless steels (FSS) to enhance their surface and mechanical properties. The use of titanium to obtain FSS sheets that are resistant to ridging due to the formation of equiaxed rather than columnar grains during solidification is well established. However, the use of titanium results in clogging the submerged entry nozzle during casting, causing surface defects in cold‐rolled products and overall production losses. To overcome the clogging problem, calcium treatment is conducted in the ladle furnace to transform inclusions into the liquid state. However, this delays the formation of the TiN inclusions which act as nuclei for the equiaxed grains, thereby increasing the fraction of columnar grains in the slabs and susceptibility to ridging in the final cold‐rolled and annealed product. Herein, the effect of calcium treatment and electromagnetic stirring (EMS) on the equiaxed grain ratio and ridging is studied with industrially produced material. The beneficial effect of EMS on grain structure and ridging is largely lost at high calcium contents, but it can be retained, provided the level of calcium is maintained at a sufficiently low, optimum level.

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Series: Steel research international
ISSN: 1611-3683
ISSN-E: 1869-344X
ISSN-L: 1611-3683
Volume: 92
Issue: 2
Article number: 2000445
DOI: 10.1002/srin.202000445
OADOI: https://oadoi.org/10.1002/srin.202000445
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Copyright information: © 2020 Wiley‐VCH GmbH. This is the peer reviewed version of the following article: Kodukula, S., Petäjäjärvi, M., Savolainen, J., Fabritius, T. and Porter, D. (2021), Influence of Calcium Treatment and Electromagnetic Stirring on Ridging in Dual‐Stabilized Ferritic Stainless Steels. steel research int., 92: 2000445, which has been published in final form at https://doi.org/10.1002/srin.202000445. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.