A material design concept for 13 % Cr OCTG (oil-country tubular goods) was established and its properties were made clear, which has a sharply improved CO2-corrosion resistance and a sour resistance compared with those of 13 % Cr OCTG of API specifications being generally used. It has been made possible to improve the CO2-corrosion resistance without generating any ferrite phase by adding copper and nickel in combination. The mechanism of improving in the CO2-corrosion resistance by adding copper and nickel in combination is presumed to be because that the corrosion film is made amorphous and that a copper layer is formed under the corrosion film. Further, the sour resistance is improved by adding molybdenum, especially adding more than 1.5 % of molybdenum in weight. The low carbon-13 % Cr-Cu-Ni-Mo steel developed on the basis of these basic studies is a high strength steel with good low temperature toughness being superior in the CO2-corrosion resistance and the sour resistance, which can be applied to many cases of such severe environments as the duplex stainless steel is to be applied.
Development of sour-resistant 13 % Cr oil-country tubular goods with improved CO2-corrosion resistance
Entwicklung von säurebeständigen Ölfeld-Rohrerzeugnissen aus 13 %igem Chromstahl mit verbesserter CO2-Korrosionsbeständigkeit
Nippon Steel Technical Report ; 72 ; 7-12
1997
6 Seiten, 12 Bilder, 3 Tabellen, 10 Quellen
Article (Journal)
English
Oil country tubular goods for sour oil and gas service
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