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LSHR, the liquid sampling hot rolling method for macro inclusion assessment
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. , 34 p.
Keyword [en]
metallurgy, steel, inclusions, oxygen, measurements
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-515ISBN: 91-7283-951-1 (print)OAI: oai:DiVA.org:kth-515DiVA: diva2:14270
Presentation
2005-02-18, B3, KTH, Brinellvägen 23, Stockholm, 14:00
Supervisors
Note
QC 20101130Available from: 2005-11-28 Created: 2005-11-28 Last updated: 2010-11-30Bibliographically approved
List of papers
1. The concept of the liquid sampling and hot rolling method for determination of macro inclusion characteristics in steel
Open this publication in new window or tab >>The concept of the liquid sampling and hot rolling method for determination of macro inclusion characteristics in steel
2006 (English)In: Steel Research International, ISSN 1611-3683, Vol. 77, no 3, 177-185 p.Article in journal (Refereed) Published
Abstract [en]

A novel method for determination of semi-macro and macro size distributions of inclusions in steel from samples in ladle, tundish and mould has been developed. The samples are worked and surface treated before inspection. Mainly immersed ultrasonic scanning is performed to determine the semi-macro and macro inclusion content. The LSHR method has been tested in several different steel plants and for different steel grades. It is concluded that new information regarding large inclusions during steelmaking can be obtained using the method.

Keyword
steel, metallurgy, steel cleanness, inclusions, sampling
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-15648 (URN)000237157800005 ()2-s2.0-33645654013 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-11-30Bibliographically approved
2. The use of the LSHR sampler to determine total oxygen contents in the ladle and tundish for different steel grades
Open this publication in new window or tab >>The use of the LSHR sampler to determine total oxygen contents in the ladle and tundish for different steel grades
2006 (English)In: Steel Research International, ISSN 1611-3683, Vol. 77, no 8, 550-557 p.Article in journal (Refereed) Published
Abstract [en]

The LSHR sampler is a new development for providing a sample volume large enough to study semi-macro and macro inclusions in clean steel. During the development of the LSHR sampler it was found that the pin where the steel enters the sampler can be used for the determination of the total oxygen content. Therefore, samples were taken at several different steel plants both in the ladle and the tundish as well as for the following five different steel grades: bearing steel, stainless steel 304L and 316L, DWI steel and ULC steel. The general conclusion regarding the sampling is that it was successful for all conditions and steel grades studied. The sample pins were examined for total oxygen content using both the inert-gas-fusion method and the fractional-gas-analysis method. Thereafter, the standard deviations with respect to the total oxygen data were used as a measure of the samples reliability. The general conclusion regarding the total oxygen determinations is that they were accurate for the five steel grades studied and the conditions under which the sampling took place.

Keyword
sample, total oxygen, ladle, tundish, mould, steel
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-15958 (URN)000240182900004 ()2-s2.0-33748335742 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-11-30Bibliographically approved
3. Some ideas of determining the macro inclusion characteristics during steelmaking.
Open this publication in new window or tab >>Some ideas of determining the macro inclusion characteristics during steelmaking.
2001 (English)Conference paper, Published paper (Refereed)
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-26948 (URN)
Conference
The 24th Electric Furnance Conference, Phoenix, Az, USA, Nov. 11-14 2004
Note
QC 20101130Available from: 2010-11-30 Created: 2010-11-30 Last updated: 2010-11-30Bibliographically approved
4. On the assessment of macro inclusions in stainless steels using ultrasonic technique.
Open this publication in new window or tab >>On the assessment of macro inclusions in stainless steels using ultrasonic technique.
2004 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Determination of the inclusion size distribution in clean steels is a difficult task since the inclusion content is very low. This is even more pronounced for inclusions in the size range between 20-100 microns. Depending on the steel application the inclusions might cause fatigue failure or rupture. The use of light optical methods for the assessment of macro or semi macro inclusions in such steel grades is not beneficial since finding sufficient number of inclusions for statistical calculations, is a very time consuming process. The application of ultrasonics with immersed scanning high frequency transducers has proven to be an excellent tool for this purpose. This technique is now used as a standard tool by a producer of ball bearing steels. However, for stainless steels there are limitations of the ultrasonic technique. In this study examination of different stainless steel grades has been done and it clearly shows that the austenitic crystal structure attenuates the sound wave to such an extent that the inclusions detected are hidden behind the background noise. This is more or less independent of the grain size. The overall result is that Ultrasonic examination for the assessment of macro and semi macro inclusions is a reasonable method for stainless steel grades with other structure than austenitic.

National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-26951 (URN)
Conference
The 16th World Conference on Nondestructive Testing, Montreal, Canada, August 30-September 3, 2004
Note
QC 20101130Available from: 2010-11-30 Created: 2010-11-30 Last updated: 2010-11-30Bibliographically approved

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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Language
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Output format
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