The Resource Formation and evolution of Spinel in aluminum killed calcium treated linepipe steels, by Obinna M. Adaba

Formation and evolution of Spinel in aluminum killed calcium treated linepipe steels, by Obinna M. Adaba

Label
Formation and evolution of Spinel in aluminum killed calcium treated linepipe steels
Title
Formation and evolution of Spinel in aluminum killed calcium treated linepipe steels
Statement of responsibility
by Obinna M. Adaba
Creator
Author
Subject
Language
eng
Summary
"Magnesium aluminate (Spinel) inclusions have been observed to cause hook crack in line pipe steels. These inclusions are typically formed during liquid steel processing at the ladle metallurgy furnace (LMF) and subsequently modified by calcium to form less harmful liquid inclusions. Unfortunately, spinel inclusions are still sometimes observed in samples taken from the tundish and coil after calcium treatment. The formation and evolution of spinel inclusions during liquid steel processing at two industrial mini mills was investigated by analysis of lollipop samples taken at different stages of the steelmaking process. The effect of reoxidation on the formation of spinels after calcium treatment was also investigated by thermodynamic calculations and laboratory experiments. The results showed that spinel inclusions are first formed in liquid steel after desulfurization and by the reaction between dissolved aluminum in liquid steel and MgO in the ladle slag. These inclusions were modified by calcium to both liquid and solid calcium aluminates. Also observed after calcium treatment, was the formation of MgO rich and CaS inclusions. During liquid steel transfer to the tundish, evidence of reoxidation and ability of CaS to act as a source of calcium to modify inclusions formed during reoxidation was observed. Analysis of the results from the laboratory experiment showed that with sufficient magnesium in steel (about 4ppm) spinel inclusions can be formed during liquid steel reoxidation. The results also showed that spinel inclusions observed after reoxidation of calcium treated steel are larger in size than those observed prior to calcium treatment. The modification of spinels by calcium and reformation after liquid steel reoxidation was verified by thermodynamic calculations"--Abstract, page iv
Related
Member of
Cataloging source
UMR
http://library.link/vocab/creatorName
Adaba, Obinna
Degree
M.S.
Dissertation year
2015
Granting institution
Missouri University of Science and Technology
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Spinel
  • Pipe, Steel
  • Steel
  • Steel
  • Refractory materials
Label
Formation and evolution of Spinel in aluminum killed calcium treated linepipe steels, by Obinna M. Adaba
Instantiates
Publication
Note
  • Vita
  • This thesis contains two papers for publication
Bibliography note
Includes bibliographic references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
936205077
Extent
1 online resource (xi, 59 pages)
Form of item
online
Governing access note
These materials are protected under copyright by the original author
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (most colored).
Specific material designation
remote
System control number
(OCoLC)936205077
Label
Formation and evolution of Spinel in aluminum killed calcium treated linepipe steels, by Obinna M. Adaba
Publication
Note
  • Vita
  • This thesis contains two papers for publication
Bibliography note
Includes bibliographic references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
936205077
Extent
1 online resource (xi, 59 pages)
Form of item
online
Governing access note
These materials are protected under copyright by the original author
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (most colored).
Specific material designation
remote
System control number
(OCoLC)936205077

Library Locations

  • Curtis Laws Wilson LibraryBorrow it
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    37.955220 -91.772210
  • Missouri University of Science & Technology Library DepositoryBorrow it
    2908 Lemone Blvd, Columbia, MO, 65201, US
    38.919360 -92.291620
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