Offshore industry as well as energy production by wind and hydropower set demanding requirements on the steel grades used for structural applications such as platform foundations, towers and masts or penstock linings. Therefore the present article aims at supporting the user in the steel grade selection by explaining the different production methods which are used today for structural steel grades as well as the resulting mechanical and chemical properties and the welding behaviour. Sufficient toughness is of importance in order to avoid brusque failure phenomena such as brittle fracture; good strength properties are necessary to minimise the dead weight of these structures in order to facilitate the transport and erection process. The significance of good fabrication properties consists of two facets: For instance a good weldability can result in easy procedures and therefore high efficiency. Moreover, material with high weldability may show a higher resistance against cracking phenomena in the heat affected zone and, therefore, also a higher forgivingness against non-optimum welding conditions, which may occur during the erection in harsh environments. Some results marking the state of material development were shown. Steel plates up to a yield stress of 690 MPa are already used for penstock pipes and some offshore components. However, also somewhat lower strength grades, such as S500M may offer considerable advantages due to excellent fabrication properties and high forgivingness allowing safe welds also under problematic site conditions.
Structural steel for the application in offshore, wind and hydro energy production: Comparison of application and welding properties of frequently used materials
Baustahl für die Anwendung für Offshore- Windkraftanlagen und Wasserkraftwerke: Vergleich der Gebrauchseignung und der Schweißbarkeit von häufig eingesetzten Werkstoffen
2008
8 Seiten, 15 Bilder, 3 Tabellen, 6 Quellen
Aufsatz (Konferenz)
Englisch
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