Since some years lower alloyed austenitic-ferritic stainless steel grades have been developed, which are summarized in the 'Lean Duplex'-family of alloys. Lean duplex materials have been used so far mainly as plate material for construction of containers and vessels in the pulp and paper business as well as in architecture and construction. As they are lower alloyed in nickel and molybdenum compared to standard duplex grades, lean duplex grades can offer economical interesting advantages combined with a higher degree of technical liability compared to supermartensitic stainless steels. Aim of the present study was to figure out, if lean duplex grades are able to close the gap between supermartensitic steels and standard duplex stainless steels with regards to weldability, structural stability, mechanical properties as well as corrosion behaviour in typical media for the oil and gas industry. Due to the fact, that there are different grades of 'lean' duplex stainless steels commercially available, which significantly differ one from the other in terms of chemical composition, the investigation covered three grades. Plasma/Tungsten Inertgas-, Laser- and Electronbeam-welding have been used for the industrial production of the longitudinal welded pipes made of Uranus 35N, Al 2003 and LDX 2101. The complete characterization of these welds has been carried out according to the Shell and PDO specifications SIEP 97-5763, SP-1095, and SP-1 189. The results have proven the suitability of longitudinally welded pipes made from lean duplex grades for linepipes for sweet and slightly sour service.
Lean duplex grades as longitudinally welded pipes for linepipes in the oil and gas business
Längsnahtgeschweißte Rohre aus Lean-Duplex-Stahlgüten für Rohrleitungen im Öl- und Gasgeschäft
2005
5 Seiten, 6 Bilder, 5 Tabellen
Conference paper
English
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