Austenitic stainless steel

Details Austenitic stainless steel Austenitic stainless steel

C - Chemistry, Metallurgy

22

C

C22C 38/40 (2006.01) C22C 38/34 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2509638

An austenitic stainless steel with minimized deformation by heating and cooling treatment after cold working, which consists of, % by mass, C: 0.03% or less, Si: 2 to 4%, Mn: 0:1 to 2%, P: 0.03% or less, S: 0.03% or less, Ni: 9 to 15%, Cr: 15 to 20%, N: 0.02 to 0.2%, Nb: 0.03% or less, each of Mo and Cu or a total of Mo and Cu: 0.2 to 4%, and the balance Fe and impurities, and satisfies the following formulas (1) and (2). This steel can also have good weldability when the following formula (3) is also satisfied in addition to the formulas (1) and (2); 16.9+6.9Ni+12.5Cu-1.3Cr+3.2Mn+9.3Mo-205C-38.5N-6.5Si-120Nb>=40 .........(1) 450-440(C+N)-12.2Si-9.5Mn-13.5Cr-20(Cu+Ni)-18.5Mo<=-90 ......(2) 8.2+30(C+N)+0.5Mn+Ni-1.1(1.5Si+Cr+Mo)+2.5Nb<=-0.8 .........(3) wherein each element symbol in the formulas (1), (2) and (3) represents the content, % by mass, of each element included in the steel.

L'invention concerne un acier inoxydable austénitique dont le changement de forme est réduit par chauffage/refroidissement après travail à froid. L'acier comprend, exprimés en pourcentage en poids, jusqu'à 0,03 % de carbone, 2 à 4 % de silicium, 0,01 à 2 % de manganèse, jusqu'à 0,03 % de phosphore, jusqu'à 0,03 % de soufre, 9 à 15 % de nickel, 15 à 20 % de chrome, 0,02 à 0,2 % d'azote, jusqu'à 0,03 % de niobium, 0,2 à 4 % de molybdène et/ou cuivre, ainsi que du fer et les impuretés constituant le solde, et il satisfait les relations (1) 16,9+6,9Ni+12,5Cu-1,3Cr+3,2Mn+9,3Mo-205C-38,5N-6,5Si-120Nb>/=40 et (2) 450-440(C+N)-12,2Si-9,5Mn-13,5Cr-20(Cu+Ni)-18,5Mo</=-90. Lorsque l'acier satisfait la relation (3) 8,2+30(C+N)+0,5Mn+Ni-1,1(1,5Si+Cr+Mo)+2,5Nb</=-0,8 en plus des relations (1) et (2), il présente également une aptitude au soudage satisfaisante. Les symboles élémentaires dans les relations (1), (2) et (3) représentent les contenus (en pourcentage en poids) des éléments respectifs dans l'acier.

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