Duplex stainless steels

Details Duplex stainless steels Duplex stainless steels

C - Chemistry, Metallurgy

21

D

C21D 9/00 (2006.01) C21D 6/00 (2006.01) C22C 38/00 (2006.01) C22C 38/40 (2006.01) C22C 38/44 (2006.01) C22C 38/54 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2462963

A duplex stainless steel includes less than, in weight percent, 3 percent nickel and 1.5 percent molybdenum. In one embodiment, the duplex stainless steel includes, in weight percent, up to 0.06 percent carbon; 15 to 25 percent chromium; 1 to less than 2.5 percent nickel; up to 3.75 percent manganese; greater than 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 to 0.0035 percent boron; iron and incidental impurities. The duplex stainless steel provided may be provided in the form of an article of manufacture, such as strip, bar, plate, sheet, casting, tubing or piping. A method for making the duplex stainless steel of the invention also is disclosed.

L'invention concerne un acier inoxydable duplex comprenant, en pourcentage en poids, moins de 3 % de nickel et moins de 1,5 % de molybdène. Dans un mode de réalisation, ledit acier inoxydable duplex comprend, en pourcentage en poids, jusqu'à 0,06 % de carbone; de 15 à 25% de chrome; de 1 à moins de 2,5 % de nickel; jusqu'à 3,75 % de manganèse; de plus de 0,12 jusqu'à 0,35 % d'azote; jusqu'à 2 % de silicium; jusqu'à 1,5 % de molybdène; jusqu'à 0,5 % de cuivre; jusqu'à 0,2 % de cobalt; jusqu'à 0,05 % de phosphore; jusqu'à 0,005 % de soufre; de 0,001 à 0,0035 % de bore; du fer et des impuretés associées. Ledit acier inoxydable peut être obtenu sous forme d'un produit manufacturé, de type bande, barre, plaque, tôle, moulage, tube ou conduit. L'invention concerne également un procédé de production dudit acier inoxydable duplex.

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