Tempered martensitic steel, method of producing a part from...

Details Tempered martensitic steel, method of producing a part from... Tempered martensitic steel, method of producing a part from...

C - Chemistry, Metallurgy

22

C

C22C 38/52 (2006.01) C21D 6/00 (2006.01) C21D 6/04 (2006.01) C22C 38/06 (2006.01) C22C 38/44 (2006.01)

Patent

CA 2607446

The invention relates to steel which is characterised by the following composition as expressed in percentages by weight: - C = 0.18 0.30 %, - Co = 5 -7 %, - Cr = 2 - 5 %, - Al = 1 - 2 %, - Mo + W/2 = 1 - 4 %, - V = trace 0.3 %, - Nb = trace 0.1 %, - B = trace - 50 ppm, - Ni = 10.5 - 15 % with Ni >= 7 + 3.5 Al, - Si = trace 0.4 %, - Mn = trace 0.4 %, - Ca = trace - 500 ppm, - Rare earths = trace - 500 ppm, - Ti = trace - 500 ppm, - O = trace - 200ppm if the steel is obtained by means of powder metallurgy or trace - 50 ppm if the steel is produced in air or under a vacuum from molten metal, - N = trace - 100 ppm, - S = trace - 50 ppm, - Cu = trace - 1 %, and - P = trace - 200 ppm, the remainder comprising iron and the inevitable impurities resulting from production. The invention also relates to a method of producing a part from said steel and to the part thus obtained.

Acier caractérisé en ce que sa composition est, en pourcentages pondéraux : - C = 0,18 - 0,30% - Co = 5 -7% - Cr = 2 - 5% - Al = 1 - 2% - Mo + W/2 = 1 - 4% - V = traces - 0,3% - Nb = traces - 0,1% - B = traces - 50 ppm - Ni = 10,5 - 15% avec Ni 7 + 3,5 Al - Si = traces - 0,4% - Mn = traces - 0,4% - Ca = traces - 500 ppm - Terres rares = traces - 500 ppm - Ti = traces - 500 ppm - O = traces - 200ppm si l'acier est obtenu par métallurgie des poudres, ou traces - 50 ppm si l'acier est obtenu par élaboration ô l'air ou sous vide à partir de métal liquide - N = traces - 100 ppm - S = traces - 50 ppm - Cu = traces - 1% - P = traces - 200 ppm le reste étant du fer et des impuretés inévitables résultant de l'élaboration. Procédé de fabrication d'une pièce à partir de cet acier, et pièce ainsi obtenue.

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