Pitting resistant duplex stainless steel alloy with improved...

C - Chemistry – Metallurgy – 21 – D

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C21D 9/00 (2006.01) C21D 1/84 (2006.01) C21D 6/00 (2006.01) C21D 11/00 (2006.01) C22C 38/20 (2006.01) C22C 38/22 (2006.01) C22C 38/42 (2006.01)

Patent

CA 2297670

A highly pitting resistant duplex stainless steel alloy is provided which comprises in weight percentages: C: 0.10 % and below; Si: 1.5 % and below; Mn: 2.0 % and below; Cr: 25.0 % to 27.0 %; Ni: 5.0 % to 7.5 %; Cu: 1.5 % to 3.5 %; N: 0.15 % and below; Mo: 0.5 % and below; and the remaining portion being substantially iron and unavoidable impurities. This alloy has greatly improved machinability when treated in the mold after casting by an accelerated heat treatment, as compared to the same alloy composition that is very slowly control cooled in a tightly closed heat treatment furnace.

Cet alliage d'acier inoxydable duplex remarquablement résistant aux piqûres est constitué, en pourcentage pondéral, de 0,10 % et moins de C, de 1,5 % et moins de Si, de 2,0 % et moins de Mn, de 25,0 à 27,0 % de Cr, de 5 à 7;5 % de Ni, de 1,5 à 3,5 % de Cu, de 0,15 % et moins de N et de 0,5 % et moins de Mo, la partie restante se composant sensiblement de fer et des inévitables impuretés. Cet alliage est doté de propriétés d'usinabilité largement améliorées s'il est traité dans un moule après coulage par un traitement thermique accéléré et ce, par rapport à l'usinabilité de la même composition d'alliage à refroidissement contrôlé très lent dans un four à traitement thermique hermétiquement fermé.

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