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Effect of Si and Ce Contents on the Nozzle Clogging in a REM Alloyed Stainless Steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2015 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 86, no 11, 1279-1288 p.Article in journal (Refereed) Published
Abstract [en]

The influence of the cerium and silicon contents on the castability of a REM-alloyed stainless steel was investigated by using pilot scale experiments. The trials were carried out with three different silicon concentrations: i) low (LSi; Si < 0.5%); ii) middle (MSi; Si approximate to 0.8-1.4%); and iii) high (HSi; Si approximate to 1.5-1.9%). During the casting, the liquid steel was teemed out through a zirconia nozzle located at the bottom of the furnace. The results showed that the nozzle clogging did drastically increase with increasing concentrations of Si and Ce up to levels larger than the critical contents (>= 1.5% Si and >= 0.05% Ce) in the cast HSi steel. In addition, the Ce content in a cast steel was found to increase linearly with an increased concentration of Si, due to the determinant effect of the Si content on an initial content of O in the melt before an addition of mischmetal. Finally, it was found that the concentration of insoluble Ce (Ce-insol.) determines the amount of inclusions and clusters in steel samples. Overall, soluble Ce concentrations larger than 250 ppm were found to be an important reason for fast nozzle clogging during casting.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2015. Vol. 86, no 11, 1279-1288 p.
Keyword [en]
stainless steel, clogging, REM-treatment, clusters, soluble and insoluble Ce content
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-177411DOI: 10.1002/srin.201400344ISI: 000363679600007Scopus ID: 2-s2.0-84945480701OAI: oai:DiVA.org:kth-177411DiVA: diva2:873683
Funder
VINNOVA
Note

QC 20151124

Available from: 2015-11-24 Created: 2015-11-20 Last updated: 2017-12-01Bibliographically approved

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