Stainless steel used for oil country tubular goods

Details Stainless steel used for oil country tubular goods Stainless steel used for oil country tubular goods

C - Chemistry, Metallurgy

22

C

C22C 38/44 (2006.01) C22C 38/02 (2006.01) C22C 38/06 (2006.01) C22C 38/42 (2006.01)

Patent

CA 2717104

A stainless steel for an oil country tubular good according to the invention includes, in percent by mass, 0.001% to 0.05% C, 0.05% to 1% Si, at most 2% Mn, at most 0.03% P, less than 0.002% S, 16% to 18% Cr, 3.5% to 7% Ni, more than 2% and at most 4% Mo, 1.5% to 4% Cu, 0.001% to 0.3% rare earth metal, 0.001% to 0.1% sol. Al, 0.0001% to 0.01% Ca, at most 0.05% O, and at most 0.05% N, and the balance consists of Fe and impurities. The stainless steel according to the invention includes REM and therefore has high SCC resistance in a high temperature chloride aqueous solution environment.

L'invention porte sur un acier inoxydable pour un tuyau de puits de pétrole, lequel inclut les composants suivants (en masse) : C : de 0,001 à 0,05 %, Si : de 0,05 à 1 %, Mn : 2 % ou moins, P : 0,03 % ou moins, S : moins de 0,002 %, Cr : de 16 à 18 %, Ni : de 3,5 à 7 %, Mo : plus de 2 % et pas plus de 4 %, Cu : de 1,5 à 4 %, un lanthanide : de 0,001 à 0,3 %, Al.sol : de 0,001 à 0,1 %, Ca : de 0,0001 à 0,01 %, O : 0,05 % ou moins et N : 0,05 % ou moins, le reste étant Fe et des impuretés. L'acier inoxydable contient un lanthanide et peut par conséquent présenter une excellente résistance à la corrosion fissurante sous tension (SCC), même dans une solution aqueuse de chlorure présentant une température élevée.

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