Nickel-containing strengthened sintered ferritic stainless...

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) B22F 3/00 (2006.01) C22C 33/02 (2006.01)

Patent

CA 2261707

Powder metallurgically produced ferritic stainless steel articles are strengthened by alloying the ferritic material with a small amount of nickel (up to 3.0 % by weight). Alloying is carried out by either admixing nickel powder to the ferritic alloy powder or by pre-alloying the stainless steel powder with nickel. Conventional sintering procedures, either in a hydrogen atmosphere or in a partial vacuum, are applicable. High strength stainless steel parts made in this manner are suitable for demanding applications, including automotive exhaust flanges and HEGO bosses.

Articles en acier inoxydable ferritique, produits à partir de poudres métallurgiques et renforcés par alliage du matériau ferritique avec une petite quantité de nickel (jusqu'à 3,0 % en poids). On compose l'alliage soit par ajout de la poudre de nickel à la poudre de l'alliage ferritique, soit par pré-alliage de la poudre d'acier inoxydable avec du nickel. On applique les processus de frittage habituels soit en atmosphère hydrogénée, soit sous vide partiel. Les pièces en acier inoxydable à haute résistance produites selon ce procédé conviennent pour les applications critiques comme les brides de conduit d'échappement des véhicules automobiles et les bossages d'analyseur HEGO.

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