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A study on molten steel/slag/refractory reactions during ladle steel refining
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 32 p.
Keyword [en]
Materials science, reoxidation, aluminium killed steel, inclusions, refractory, molten slag, corrosion rate
Keyword [sv]
Materialvetenskap
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-312ISBN: 91-7178-090-4 (print)OAI: oai:DiVA.org:kth-312DiVA: diva2:8882
Presentation
2005-06-16, B2, Brinellvägen 23, Stockholm, 10:00
Supervisors
Note
QC 20101203Available from: 2005-07-18 Created: 2005-07-18 Last updated: 2010-12-03Bibliographically approved
List of papers
1. Magnesia-carbon refractory dissolution in Al killed low carbon steel
Open this publication in new window or tab >>Magnesia-carbon refractory dissolution in Al killed low carbon steel
2006 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 33, no 5, 389-397 p.Article in journal (Refereed) Published
Abstract [en]

The effects of rotation speed, steel temperature and steel composition on the rate of dissolution of MgO-C refractory into Al deoxidised molten steel were investigated using the rotating cylinder method. Cylinders or rods of MgO-C refractory material were immersed in an Al deoxidised molten steel. Experiments were performed for steel temperatures between 1873 and 1973 K and rotation speeds between 100 and 800 rev min(-1) as well as for different immersion times. For each case, the dissolution rate of MgO-C material was determined from measurement of the decrease in the rod radius. The experimental results showed that the dissolution rate of the MgO-C refractory material increased with an increase in steel temperature and rotation speed. The findings strongly suggest the diffusion of magnesium through the slag layer formed around the refractory rods to be a rate determining step. This thin oxide layer at the steel/refractory interface was found to be owing to reaction between magnesium vapour and CO generated by the reaction between MgO and C in the refractory. Oxide inclusions were also found in the steel melt and they were shown to mainly consist of MgO and Al2O3 or a mixture of the two.

Keyword
reoxidation; aluminium killed steel; low carbon; inclusions; refractory; slag
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-8487 (URN)10.1179/174328106X113977 (DOI)000241457300007 ()2-s2.0-33749685030 (Scopus ID)
Note
QC 20100813 Tidigare titel:A laboratory study of Magnesia refractory dissolution in Al-killed low-carbon steel. Available from: 2008-05-16 Created: 2008-05-16 Last updated: 2017-12-14Bibliographically approved
2. Corrosion mechanism and kinetic behaviour of MgO-C refractory material in contact with CaO-Al2O3-SiO2-MgO slag
Open this publication in new window or tab >>Corrosion mechanism and kinetic behaviour of MgO-C refractory material in contact with CaO-Al2O3-SiO2-MgO slag
2005 (English)In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 34, no 5, 283-292 p.Article in journal (Refereed) Published
Abstract [en]

The rate of dissolution of solid MgO-C into liquid CaO-Al2O3-SiO2-MgO slag at different temperatures was studied under conditions of forced convection by rotating cylindrical refractory specimens in a stationary crucible containing molten slag. The corrosion rate was calculated from the change in diameter of the cylindrical refractory specimens. The specimens were rotated for 15-120 min at a speed of 100-400 rpm in the molten slag. The rate of corrosion was found to increase with an increase in temperature and rod rotation speed, and to decrease when the slag was nearly saturated with MgO. The experimental results support the assumption that the diffusion of magnesium oxide through the slag-phase boundary layer controls the corrosion process. The corrosion mechanism seems to be the dissolution of refractory material into the slag followed by penetration of pores and grain boundaries and dispersion of the grains into the slag.

Keyword
corrosion mechanism; corrosion rate; MgO-C refractory; molten slag
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-8488 (URN)10.1111/j.1600-0692.2005.00748.x (DOI)000232659900003 ()
Note
QC 20100813Available from: 2008-05-16 Created: 2008-05-16 Last updated: 2017-12-14Bibliographically approved

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