University of Oulu

T Alatarvas et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 529 012066

Utilizing inclusion data in characterization of oxide-sulfide stringers in hot-rolled plates

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Author: Alatarvas, Tuomas1; Antola, Tuomas2; Fabritius, Timo1
Organizations: 1Process Metallurgy Research Unit, P.O. Box 4300, FI-90014 University of Oulu, Finland
2SSAB Europe Oy, P.O. Box 93, FI-92101 Raahe, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: IOP Publishing, 2019
Publish Date: 2019-06-26


The targets of this study were to determine the effect of vertical location and the composition of inclusions to the occurrence of oxide–sulfide stringers, and to determine the calcium aluminate phases most prone to form stringers during hot rolling of aluminium killed, calcium treated steel. The phases present in the inclusions have a significant effect on the deformation of inclusions during hot rolling, and consequently, on mechanical properties of the steel. A MATLAB script is utilized to identify and locate detrimental stringers from the hot rolled plates. Inclusion analysis data gathered with a scanning electron microscope and exported from IncaFeature software is analyzed. The following properties are presented for each stringer: the number of inclusions and length of stringer, phase fractions and compositions, and the composition of the unfragmented inclusion before hot rolling. According to the results, the longest stringers have total lengths over 200 µm, with almost 20 inclusions. The overall composition of the longest stringers is between C12A7 and C3A calcium aluminates with minor MgO contents. The diameters of the unfragmented inclusions in the slabs, forming stringers during hot rolling, were estimated to be around 20 µm for the longest stringers. From the dataset, plenty of CaO–CaS stringers were also characterized, obviously a result of excess calcium treatment.

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Series: IOP conference series. Materials science and engineering
ISSN: 1757-8981
ISSN-E: 1757-899X
ISSN-L: 1757-8981
Volume: 529
Issue: 1
Article number: 012066
DOI: 10.1088/1757-899X/529/1/012066
Conference: Joint 5th International Conference on Advances in Solidification Processes (ICASP-5) & 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining (CSSCR-5)
Type of Publication: A4 Article in conference proceedings
Field of Science: 215 Chemical engineering
216 Materials engineering
Funding: This research has been carried out under the Academy of Finland project no. 311934 (Genome of Steel).
Copyright information: © Copyright 2019 IOP Publishing. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.