Method of producing stainless steels having improved...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/00 (2006.01) C21D 1/09 (2006.01) C21D 1/26 (2006.01) C21D 6/00 (2006.01) C21D 9/00 (2006.01) C22C 19/05 (2006.01) C22C 28/00 (2006.01) C22C 38/00 (2006.01) C22C 38/44 (2006.01) F28F 21/08 (2006.01)

Patent

CA 2443545

A method for producing a stainless steel with improved corrosion resistance includes homogenizing at least a portion of an article of a stainless steel including chromium, nickel, and molybdenum and having a PREN of at least 50, as calculated by the equation: PREN = Cr + (3.3 x Mo) + (30 x N), where Cr is weight percent chromium, Mo is weight percent molybdenum, and N is weight percent nitrogen in the steel. In one form of the method, at least a portion of the article is remelted to homogenize the portion. In another form of the method, the article is annealed under conditions sufficient to homogenize at least a surface region of the article. The method of the invention enhances corrosion resistance of the stainless steel as reflected by the steel's critical crevice corrosion temperature.

Procédé de fabrication d'aciers inoxydables présentant une meilleure résistance à la corrosion, qui consiste à homogénéiser au moins une partie d'un article en acier inoxydable comprenant du chrome, du nickel et du molybdène et possédant un PRE¿N? d'au moins 50, calculé selon l'équation: PRE¿N? = Cr + (3.3 x Mo) + (30 x N), dans laquelle Cr est le chrome en % en poids, Mo est le molybdène en % en poids et N est l'azote en % en poids, contenus dans l'acier. Dans une forme de ce procédé, au moins une partie de l'article est fusionnée de nouveau pour homogénéiser cette partie. Dans une autre forme de ce procédé, on recuit l'article dans des conditions suffisantes pour homogénéiser au moins une zone de surface de l'article. Le procédé de l'invention permet d'améliorer la résistance de l'acier inoxydable à la corrosion, réfléchie par la température critique de formation des fissures de corrosion.

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