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Inclusion rating of clean steels: a study on role of steel cleanliness on fatigue performance of forged steel components used in marine propulsion
Det Norske Veritas, Høvik, Norway.
Det Norske Veritas, Høvik, Norway.
Örebro University, School of Science and Technology. (Formingsteknik)
Örebro University, School of Science and Technology. (Formningsteknik)
2010 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Det Norske Veritas (DNV) Maritime, Section for Machinery, is responsible for approval of machinery in ships for DNV Class. Allowable fatigue stresses in forged steel is a key input parameter for such evaluations, and are regulated in DNV’s Rules. It is well known that the cleanliness of the steel is important for its fatigue strength. To account for this, “clean steel” has been defined in DNV’s Rules for forgings. For “clean steel”, an extra 10% is allowed in the components fatigue strength, compared to ordinary forged steels. Clean steel is given a factor of 1.1. Recently, one leading steel manufacturer has claimed that even higher benefits can be gained by using “super clean steels”, and a factor 1.15 has been claimed. The improvement has been demonstrated by fatigue testing. It appears that although the claimed 125% may be justified, there are limits to how much gain it is possible to obtain by increasing steel cleanliness. In order to approve such increased fatigue strength in attempt has been made to find ways to correlate demonstrated cleanliness to increased fatigue strength by chemical and/or metallographic means without performing extensive fatigue test series. Only with such criteria, it is possible to certify “super clean steel”, and accept the use of its increased fatigue strength with reference to the material certificate. This paper covers a study concerning the methods that are available for determining the cleanliness level for steels. Examples of methods that can be used for finding and testing material for the presence of big inclusions are reported.

Place, publisher, year, edition, pages
2010.
National Category
Mechanical Engineering
Research subject
Mechanical Engineering
Identifiers
URN: urn:nbn:se:oru:diva-24301OAI: oai:DiVA.org:oru-24301DiVA, id: diva2:543378
Conference
CIMAC (Conseil International des Machines a Combustion) Congress 2010, Bergen
Available from: 2012-08-07 Created: 2012-08-07 Last updated: 2018-04-24Bibliographically approved

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Jarl, Magnus

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf