High-strength stainless steel pipe excellent in sulfide...

C - Chemistry – Metallurgy – 22 – C

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

Patent

CA 2733649

The problem to be solved is the provision of a high-strength stainless steel pipe having a sufficient corrosion resistance in a high-temperature carbonic acid gas environment and having an excellent sulfide stress cracking resistance at normal temperature. A high-strength stainless steel pipe consist of, by mass%, C: 0.05% or less, Si: 1.0% or less, P: 0.05% or less, S: less than 0.002%, Cr: more than 16% and 18% or less, Mo: more than 2% and 3% or less, Cu: 1% to 3.5%, Ni: 3% or more and less than 5%, Al: 0.001% to 0.1% and O:0.01% or less, Mn: 1% or less and N:0.05% or less, and Mn and N in the above ranges satisfy formula (1), and the balance being Fe and impurities; and the metal micro-structure of the stainless steel pipe mainly includes a martensitic phase and comprises 10 to 40% of a ferritic phase by volume fraction and 10% or less of a retained .gamma.-phase by volume fraction. [Mn] × ([N]-0.0045) <= 0.001 (1) wherein the symbols of elements in formula (1) respectively represent the contents (unit: mass%) of the elements in the steel.

La présente invention concerne un tuyau en acier inoxydable à haute limite élastique qui contient, en % en masse, C = 0,05 %, Si = 1,0 %, P = 0,05 %, S < 0,002 %, Cr > 16 % et = 18 %, Mo > 2 % et = 3 %, Cu 1 % - 3,5 %, Ni = 3 % et < 5 %, Al 0,001 % - 0,1 %, O = 0,01 %, Mn = 1 % et N de l'ordre de = 0,05 %, Mn et N satisfaisant l'équation (1), le reste comprenant du Fe et des impuretés. La structure métallique est principalement une phase de martensite, avec une phase de ferrite de 10 40 % v/v et une phase ? résiduelle = 10 % v/v. Ce tuyau en acier inoxydable à haute limite élastique présente une résistance à la corrosion appropriée dans un environnement contenant du dioxyde de carbone à haute température et une résistance élevée à la corrosion fissurante en présence d'hydrogène sulfuré à des températures normales.      [Mn] x ([N] 0,0045) = 0,001 (1) où les symboles des éléments dans l'équation (1) représentent les quantités de chaque élément dans l'acier (unités : % en masse).

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