Stainless steel for oil well, stainless steel pipe for oil...

Details Stainless steel for oil well, stainless steel pipe for oil... Stainless steel for oil well, stainless steel pipe for oil...

C - Chemistry, Metallurgy

22

C

C22C 38/44 (2006.01) C21D 8/02 (2006.01) C21D 8/10 (2006.01) C21D 9/08 (2006.01) C22C 38/50 (2006.01)

Patent

CA 2760297

Disclosed is a stainless steel having the following chemical composition: C: 0.05% or less, Si: 0.5% or less, Mn: 0.01 to 0.5%, P: 0.04% or less, S: 0.0 1% or less, Cr: more than 16.0% and not more than 18.0%, Ni: more than 4.0% and not more than 5.6%, Mo: 1.6 to 4.0%, Cu: 1.5 to 3.0%, Al: 0.001 to 0.10%, and N: 0.050% or less, with the remainder being Fe and impurities, wherein the components meet the requirements represented by formulae (1) and (2). The structure of the stainless steel contains a martensite phase and 10 to 40% by volume of a ferrite phase, wherein the percentage of distribution of the ferrite phase is greater than 85%. Cr + Cu + Ni + Mo >= 25.5 (1) -8 <= 30(C+N) + 0.5Mn + Ni + Cu/2 + 8.2 - 1.1(Cr+Mo) <=-4 (2)

La présente invention concerne un acier inoxydable ayant la composition chimique suivante : C : inférieur ou égal à 0,05 %, Si : inférieur ou égal à 0,5 %, Mn : 0,01 à 0,5 %, P : inférieur ou égal à 0,04 %, S : inférieur ou égal à 0,01 %, Cr : supérieur à 16,0 % et inférieur ou égal à 18,0 %, Ni : supérieur à 4,0 % et inférieur ou égal à 5,6 %, Mo : 1,6 à 4,0 %, Cu : 1,5 à 3,0 %, Al : 0,001 à 0,10 % et N : inférieur ou égal à 0,050 %, le reste étant constitué de Fe et d'impuretés. Dans cette composition, les composants répondent aux conditions posées par les formules (1) et (2). La structure de l'acier inoxydable présente une phase de martensite et de 10 à 40 % en volume d'une phase de ferrite, le pourcentage de distribution de la phase de ferrite étant supérieur à 85 %. Cr + Cu + Ni + Mo = 25,5 (1) -8 = 30(C+N) + 0,5 Mn + Ni + Cu/2 + 8,2 1,1(Cr+Mo) = -4 (2)

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