Ferritic stainless steel and use thereof in the manufacture...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/18 (2006.01) C21D 6/00 (2006.01) C22C 38/00 (2006.01) C22C 38/02 (2006.01) C22C 38/06 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01) C21D 8/02 (2006.01)

Patent

CA 2461869

Ferritic stainless steel, comprising the following Chemical elements expressed in percentage by weight: - Cr 14.0-20.0 - Al 0.50-1.50 - Zr 0.10-0.50 - Si 0.30-1.50 - Ti 0.10-0.35 - Nb 0.25-0.55- C < 0.035 - N < 0.035 provided that the content of Ti, Nb, C and N satisfy the following relation: %Ti + %Nb/1.94 > 9 (%C + %N) and substantially iron q. s. to 100. This steel may also comprise Yttrium and/or rare earth elements in a percentage by weight comprised in the range 0.10-0.30. The invention also encompasses products manufacturable with the steel of the invention, in particular vehicle exhaust manifold systems. Figure (I) shows a cyclic oxidation test carried out at 1000~C on samples having the composition of an embodiment of the steel according to the invention.

La présente invention concerne de l'acier ferritique qui renferme les éléments chimiques suivants exprimés en pourcentage en poids: Cr: de 14,0 à 20,0; Al: de 0,50 à 1,50; Zr: de 0,10 à 0,50; Si: de 0,30 à 1,50; Ti: de 0,10 à 0,35; Nb: de 0,25 à 0,55; C < 0,035 ; N < 0,035, à condition que la teneur en Ti, Nb, C et N corresponde à la relation suivante : %Ti + %Nb/1,94 > 9 (%C + %N) et sensiblement du fer q.s pour 100. Cet acier peut également comprendre de l'yttrium et/ou des éléments des terres rares suivant un pourcentage en poids compris dans la fourchette 0,10 - 0,30. Cette invention concerne également des produits pouvant être élaborés avec l'acier selon l'invention, notamment des systèmes de collecteur d'échappement pour des véhicules. La figure illustre un essai d'oxydation cyclique effectué à 1000·C sur des échantillons comprenant la composition d'une forme de réalisation de l'acier selon la présente invention.

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