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The influence of stirring method on hydrogen removal during ladle treatment
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.
2002 (English)In: Steel research, ISSN 0177-4832, Vol. 73, no 3, 82-90 p.Article in journal (Refereed) Published
Abstract [en]

A mathematical model based on fundamental transport equations for vacuum degassing in an Asea-SKF ladle furnace was developed earlier and predicted hydrogen values from the model were found to agree well with experimental measurements from plant trials. In the present study. the mathematical model was used to predict the hydrogen removal for four different stirring methods: 1-2) combined gas and induction stirring with the inductive stirrer working upwards or downwards and 3-4) gas stirring with two different locations for two porous plugs. Plant data was used as input to the calculations. The hydrogen calculation was validated by simulation of an actual heat and comparison with measured data. After 44 minutes of stirring the predicted and measured hydrogen contents were 1.6 and 1 8 ppm, respectively This agreement was considered satisfactory and the model was then used to study the effect of different stirring methods on hydrogen refining, A change in the stirring method was found to affect the hydrogen refining. Combined gas and induction stirring using downward stirring was found to result in the lowest final hydrogen content in the steel as it rendered the most favourable kinetic conditions for hydrogen refining.

Place, publisher, year, edition, pages
2002. Vol. 73, no 3, 82-90 p.
Keyword [en]
fluid-flow, model, water
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-21451ISI: 000174879600004OAI: oai:DiVA.org:kth-21451DiVA: diva2:340149
Note

QC 20100525

NR 20140804Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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