Duplex stainless steel

Details Duplex stainless steel Duplex stainless steel

C - Chemistry, Metallurgy

22

C

C22C 38/18 (2006.01) C22C 38/42 (2006.01) C21D 8/02 (2006.01)

Patent

CA 2656946

The invention relates to a duplex stainless steel composition consisting, in percent by weight, of: C < 0.05%; 21% <= Cr < 25%; 1% <= Ni <= 2.95%; 0.16% <= N <= 0.28%; Mn <= 2.0% Mo +W/2 <= 0.50%; Mo <= 0.45%; W < 0.15%; Si < 1.4%; Al < 0.05%; 0.11% <= Cu <= 0.50%; S < 0.010%; P <= 0.040%; Co <= 0.5%; REM <= 0.1%; V <= 0.5%; Ti <= 0, 1%; Nb <= 0.3%; Mg < 0.1%, the balance being iron and impurities resulting from the smelting, and the microstructure consisting of austenite and 35 to 65% ferrite by volume, the composition furthermore satisfying the following relationships: 40 <= IF < 70 with IF = 6´(%Cr + 1.32´%Mo + 1.27´%Si) - 10´(%Ni + 24´%C + 16.15´%N + 0.5´%Cu + 0.4´%Mn) - 6.17 and IRCL > 30.5, where IRCL = %Cr +3.3´%Mo +16´%N + 2.6´%Ni - 0.7´%Mn, and to a process for manufacturing plates, sheets, coils, bars, wires, sections, forgings and castings made of this steel.

L'invention concerne une composition d'acier inoxydable duplex, dont la composition est constituée de, en % en poids : C < 0,05 % 21 % <= Cr < 25 % 1 % <= Ni <= 2,95% 0,16 % <= N <= 0,28 % Mn <= 2,0 % Mo +W/2 <= 0,50 % Mo <= 0,45% W < 0,15 % Si < 1,4% Al < 0,05 % 0,11% <= Cu <= 0,50 % S < 0,010 % P <= 0,040 % Co <= 0,5 % ~ REM <= 0,1 % V <= 0,5 % Ti <= 0, 1 % Nb <= 0,3 % Mg < 0,1 % le reste étant du fer et des impuretés résultant de l'élaboration et la microstructure étant constituée d'austénite et de 35 à 65% de ferrite en volume, la composition respectant en outre les relations suivantes : 40 <= IF < 70 avec IF = 6 x (%Cr + 1,32 x %Mo + 1,27.chi. %Si) - 10x (%Ni + 24 x %C + 16,15 x %N + 0,5 x %Cu + 0,4 x %Mn) - 6,17 et IRCL > 30,5 avec IRCL = %Cr +3,3 x %Mo +16 x %N + 2,6 x %Ni - 0,7 x %Mn ainsi qu'un procédé de fabrication de tôles, bandes, bobines, barres, fils, profilés, pièces forgées, pièces moulées en cet acier.

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