Cooled and tempered bainite steel part and its manufacturing...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/16 (2006.01) C21D 1/02 (2006.01) C21D 8/00 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01) C22C 38/58 (2006.01) C21D 1/18 (2006.01)

Patent

CA 2452647

L'invention concerne un procédé de fabrication d'une pièce en acier, caractérisé en ce que: - on élabore et on coule un acier de composition, en pourcentages pondéraux, 0,06% <= C <= 0,25% ; 0,5% <= Mn <= 2% ; traces <= Si <= 3% ; traces <= Ni <= 4,5% ; traces,<= Ai <= 3% ; traces <= Cr <= 1,2% ; traces <= Mo <= 0,30% ; traces <= V <=2% ; traces <= Cu <= 3,5% ; et respectant l'une au moins des conditions: * 0,5% <= Cu <= 3,5% *0,5%<=V<=2% *2%<=Ni<= 4,5% et 1% <= AI<=2% le reste étant du fer et des impuretés résultant de l'élaboration; - on effectue au moins une déformation à chaud de l'acier coulé pour obtenir une ébauche de la pièce à une température de 1100 à 1300°C; - on effectue un refroidissement contrôlé de l'ébauche de la pièce à l'air calme ou à l'air pulsé ; - et on effectue un revenu de précipitation, précédant ou suivant l'usinage de la pièce à partir de ladite ébauche. L'invention concerne également une pièce ainsi obtenue.

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