Martensitic stainless steel oil country tubular good

Details Martensitic stainless steel oil country tubular good Martensitic stainless steel oil country tubular good

C - Chemistry, Metallurgy

22

C

C22C 38/38 (2006.01) C22C 38/02 (2006.01) C22C 38/06 (2006.01) E21B 17/00 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01) C22C 38/32 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2589914

A martensitic stainless steel oil country tubular good contains, by mass, 0.005% to 0.1% C, 0.05% to 1% Si, 1.5% to 5% Mn, at most 0.05% P, at most 0.01% S, 9% to 13% Cr, at most 0.5% Ni, at most 2% Mo, at most 2% Cu, 0.001% to 0.1% Al, and 0.001% to 0.1% N, with the balance being Fe and impurities, and the pipe has a Cr-depleted region under the surface. The martensitic stainless steel oil country tubular good according to the present invention does not have a passive film on the surface and corrodes wholly at low speed. In addition, the Ni content is reduced, which allows uneven corrosion to be prevented. Therefore, SCC can be prevented from being generated in spite of the presence of a Cr-depleted region.

L'invention concerne un tube en acier inoxydable martensitique pour un puits de pétrole, caractérisé en ce que sa composition chimique, en % massique s'établit comme suit C: 0,005 à 0,1 %, Si: 0,05 à 1 %, Mn: 1,5 à 5 %, P: 0,05 % ou moins, S: 0,01 % ou moins, Cr: 9 à 13 %, Ni: 0,5 % ou moins, Mo: 2 % ou moins, Cu: 2 % ou moins, Al: 0,001 à 0,1 %, N: 0,001 à 0,1 %, le reste étant constitué de Fe et d'impuretés, et en ce qu'il possède, sous sa surface, une région pauvre en Cr. Ledit tube en acier inoxydable martensitique pour un puits de pétrole ne comporte pas de film de revêtement passif à sa surface, et toute sa surface est corrodée à une vitesse lente. De plus, la réduction de la teneur en Ni empêche une corrosion non uniforme. Il est donc possible d'éviter la formation de fissures par corrosion sous contrainte, même si le tube présente une région pauvre en Cr.

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