C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/22 (2006.01) C21D 8/00 (2006.01) C21D 8/10 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/18 (2006.01) C22C 38/28 (2006.01)
Patent
CA 2453964
A steel material and a steel pipe made by using the same are provided which are to be used in severe oil well environments. Such a highly tough oil well steel pipe can be produced by rolling the base material, quenching the roIling product from the austenite region and tempering the same so that the relationship between the content of Mo [Mo] in the carbides precipitated at austenite grain boundaries and the austenite grain size (according to ASTM E 112) can be defined by the formula (a) given below. In this manner, steel pipes suited for use even under oil well environments becoming more and more severe can be produced while satisfying the requirements that the cost should be rationalized, the productivity improved and energy saved. [Mo] ~ exp(G - 5) + 5 ... (a)
L'invention concerne un matériau acier utilisé dans un environnement de puits de pétrole présentant des contraintes, ainsi que des tuyaux en acier fabriqués à partir dudit matériau. L'invention concerne également un procédé permettant de produire des tuyaux haute résistance, ce procédé consistant à rouler une pièce d'ébauche, à la tremper à partir d'une zone austénitique et à la faire revenir, le rapport entre la quantité de Mo [Mo] ( % en masse) dans le carbure qui se dépose dans le joint de grain austénitique et la taille de grain austénitique (loi ASTM E 112) est représenté par la formule (a) ci-dessous. On obtient ainsi un matériau acier et des tuyaux en acier pouvant être utilisés dans un environnement de puits de pétrole dont les contraintes s'accentuent. L'invention permet en outre de rationaliser les coûts, d'améliorer l'efficacité de production et de faire des économies d'énergie. [Mo] </= exp (G - 5) + 5 (a)
Abe Toshiharu
Kawano Kaori
Nakamura Shigeru
Omura Tomohiko
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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