Duplex stainless steel

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/44 (2006.01) C22C 38/42 (2006.01) C22C 38/52 (2006.01) C22C 38/58 (2006.01) E21B 17/00 (2006.01)

Patent

CA 2586452

A duplex stainless steel alloy which contains in weight %: Cr 25- 35%, Ni 4- 10%, Mo 1 -6%, N 0.3-0.6%, Mn greater than 0-3%, Si max 1.0%, C max 0.06%, Cu and/or W and/or Co 0.1-10%, W 0.1 -5%, balance Fe and normally occurring impurities wherein the ferrite content is 30-70%. The alloy has a yield point in tension being min 760 MPa.

L'invention concerne un alliage d'acier inoxydable duplex qui comprend, en pourcentage en poids : entre 25 et 35 % de Cr ; entre 4 et 10 % de Ni ; entre 1 et 6 % de Mo ; entre 0,3 et 0,6 % de N ; une quantité supérieure à 0-3 % de Mn, une quantité maximale de 1,0 % de Si ; une quantité maximale de 0,06 % de C ; entre 0,1 et 10 % de Cu et/ou de W et/ou de Co ; entre 0,1 et 5 % de W ; un complément de Fe et des impuretés présentes de manière inévitable dans lesquelles la teneur en ferrite est comprise entre 30 et 70 %. Ledit alliage présente une limite apparente d'élasticité en tension minimum de 760 MPa.

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