Coated carbon steel is historically considered as the most economic construction material. However, during recent years uncoated stainless steels have gradually been introduced in the market, and depending on various factors, the new lean duplex stainless steels may gradually take over as the most suitable material for certain components in the future. The paper will focus on the use of stainless steels for structural components, and the status of stainless steels within different parts of the oil and gas indus. try will be given. The beneficial use of lean duplex stainless steel compared with 316 stainless steel will be shown and discussed. Stainless steel type 316 has been used for minor structures like pipe supports etc. but not for larger structures like pipe racks. The introduction of lean duplex stainless steels may change this picture. Lean duplex stainless steel has considerable lower cost compared to 316 and the strength is higher. Provided lean duplex steel is available in required dimensions. the lean duplex stainless steels may be the future material for pipe supports, pipe racks, mantling material, weather walls and so on, especially if health, safety and maintenance costs are taken into consideration. Welding related subjects will also be covered together with a discussion of maintaining the corrosion resistance after welding. The Norwegian offshore industry has used 316 stainless steel for cable trays and pipe supports for many years. This has been a success for the fabrication yards, and the end users are satisfied due to reduced maintenance costs. This material selection is now a standard engineering design for the Norwegian engineering houses like Aker Kvaerner. The next step will be to extend the share of stainless steels also as a construction material, by use of lean duplex stainless steels.
Lean duplex stainless steels for structural applications
Sparsam legierte nichtrostende Duplex-Stähle für Stahlkonstruktionen
2007
9 Seiten, 12 Bilder, 2 Tabellen, 2 Quellen
Conference paper
English
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