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Modification of Non-Metallic Inclusions in Oil-Pipeline Steels by Ca-Treatment
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Natl Univ Sci & Technol MISIS, Dept Funct Nanosyst & Hightemp Mat, Leninsky Prospect 4, Moscow 119049, Russia..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Natl Univ Sci & Technol MISIS, Dept Funct Nanosyst & Hightemp Mat, Leninsky Prospect 4, Moscow 119049, Russia..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0001-9775-0382
2019 (English)In: METALS, ISSN 2075-4701, Vol. 9, no 4, article id 391Article in journal (Refereed) Published
Abstract [en]

Corrosion rate in different steel grades (including oilfield pipeline steels) is determined by the presence of non-metallic inclusions (NMI) in steels. Specifically, the effect of different inclusions on the quality of steels depends on their characteristics such as size, number, morphology, composition, and physical properties, as well as their location in the steel matrix. Therefore, the optimization and control of NMI in steels are very important today to obtain an improvement of the material properties of the final steel products. It is well known that a Ca-treatment of liquid steels in ladle before casting is an effective method for modification of non-metallic inclusions for improvement of the steel properties. Therefore, the NMI characteristics were evaluated in industrial steel samples of low carbon Ca-treated steel used for production of oil-pipelines. An electrolytic extraction technique was used for extraction of NMI from the steel samples followed by three-dimensional investigations of different inclusions and clusters by using SEM in combination with EDS. Moreover, the number and compositions of corrosion active non-metallic inclusions were estimated in hot rolled steel samples from two different heats. Finally, the corrosion resistance of these steels can be discussed depending on the characteristics of non-metallic inclusions present in the steel.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 4, article id 391
Keywords [en]
oil-pipeline steel, Ca-treatment, non-metallic inclusions, electrolytic extraction, corrosion
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-252645DOI: 10.3390/met9040391ISI: 000467637000008Scopus ID: 2-s2.0-85064179266OAI: oai:DiVA.org:kth-252645DiVA, id: diva2:1321869
Note

QC 20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved

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Sidorova, ElenaKarasev, AndreyJönsson, Pär

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