C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/00 (2006.01) C21D 8/10 (2006.01) C21D 9/08 (2006.01) C22C 38/12 (2006.01) C22C 38/58 (2006.01)
Patent
CA 2620049
Disclosed is a seamless steel pipe for line pipes which has high strength and stable toughness while exhibiting good sulfide corrosion cracking resistance over a temperature range from low temperature to room temperature. The seamless steel pipe has a chemical composition consisting of, in mass%, 0.03- 0.08% of C, 0.05-0.5% of Si, 1.0-3.0% of Mn, more than 0.4% and not more than 1.2% of Mo, 0.005-0.100% of Al, 0.001-0.005% of Ca and the balance of Fe and impurities including N, P, S, O and Cu. In the impurities, N is not more than 0.01%, P is not more than 0.05%, S is not more than 0.01%, O is not more than 0.01%, and Cu is not more than 0.1%. The seamless steel pipe has a microstructure composed of a bainite-martensite duplex structure.
L~invention concerne un tuyau d~acier sans couture pour tuyaux d~oléoduc présentant une forte résistance et une robustesse stable tout en garantissant une bonne résistance au fissurage par corrosion de sulfure dans une fourchette de température allant des basses températures à la température ambiante. Le tuyau d~acier sans couture présente une composition chimique consistant en, en % de masse, de 0,03 à 0,08% de C, de 0,05 à 0,5% de Si, de 1,0 à 3,0% de Mn, plus de 0,4% et pas plus de 1,2% de Mo, de 0,005 à 0,100% d~Al, de 0,001 à 0,005% de Ca et le reste étant constitué de Fe et d~impuretés englobant N, P, S, O et Cu. Parmi les impuretés, N ne dépasse pas 0,01%, P ne dépasse pas 0,05%, S ne dépasse pas 0,01%, O ne dépasse pas 0,01%, et Cu ne dépasse pas 0,1%. Le tuyau d~acier sans couture possède une microstructure composée d~une structure duplex bainite-martensite.
Arai Yuji
Hisamune Nobuyuki
Kobayashi Kenji
Kondo Kunio
Omura Tomohiko
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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