C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/12 (2006.01) C21D 8/10 (2006.01) C21D 9/08 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/58 (2006.01) C22C 38/38 (2006.01)
Patent
CA 2620069
A thick-walled seamless steel pipe for line pipe which has a high strength and improved toughness and corrosion resistance in spite of the thick wall and which is suitable for use as a riser and flow line has a chemical composition comprising, in mass percent, C: 0.02 - 0.08%, Si: at most 0.5%, Mn: 1.5 - 3.0%, Al: 0.001 - 0.10%, Mo: greater than 0.4% - 1.2%, N: 0.002 - 0.015%, at least one of Ca and REM in a total amount of 0.0002 - 0.007%, and a remainder of Fe and impurities, with the impurities having the content of P: at most 0.05%, S: at most 0.005%, and O: at most 0.005%, the chemical composition satisfying the inequality: 0.8 <= [Mn] x [Mo] <= 2.6, wherein [Mn] and [Mo] are the numbers equivalent to the contents of Mn and Mo, respectively, in mass percent.
L~invention concerne un tuyau d~acier sans couture pour tuyaux d~oléoduc convenant aux conduits d~écoulement ou aux colonnes montantes de par sa résistance élevée, son excellente robustesse et sa bonne résistance à la corrosion même s~il est épais. Ce tuyau d~acier sans couture pour tuyaux d~oléoduc a une composition chimique consistant en, en % de masse, de 0,02 à 0,08% de C, pas plus de 0,5% de Si, de 1,5 à 3,0% de Mn, de 0,001 à 0,10% d~Al, plus de 0,4% et pas plus de 1,2% de Mo, de 0,002 à 0,015% de N, de 0,0002 à 0,007% de Ca et un ou deux de REM au total, et le reste étant composé de Fe et d~impuretés. Parmi les impuretés, P ne dépasse pas 0,05%, S ne dépasse pas 0,005%, et O ne dépasse pas 0,005%. Le tuyau d~acier sans couture pour tuyaux d~oléoduc satisfait à la formule suivante : 0,8 <= [Mn] × [Mo] <= 2,6 (où [Mn] et [Mo] représentent des valeurs équivalentes à des teneurs respectives de Mn et de Mo en % de masse).
Arai Yuji
Hisamune Nobuyuki
Kondo Kunio
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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