Hardened martensitic steel having a low or zero content of...

Details Hardened martensitic steel having a low or zero content of... Hardened martensitic steel having a low or zero content of...

C - Chemistry, Metallurgy

21

D

C21D 6/00 (2006.01) B64C 25/02 (2006.01) B64D 27/00 (2006.01) C21D 6/02 (2006.01) C21D 6/04 (2006.01) C22C 38/44 (2006.01) C22C 38/50 (2006.01) C22C 38/52 (2006.01) F16D 3/00 (2006.01) F16H 3/00 (2006.01)

Patent

CA 2694844

Steel characterized in that its composition is, in percentages by weight: - C = 0.20 - 0.30%; - Co = traces - 1%; - Cr = 2 - 5%; - Al = 1 - 2%; - Mo + W/2 = 1 - 4%; - V = traces - 0.3%; - Nb = traces - 0.1%; - B = traces - 30 ppm; - Ni = 11 - 16% with Ni = 7 + 3.5 Al; - Si = traces - 1.0%; - Mn = traces - 2.0%; - Ca = traces - 20 ppm; - rare earths = traces - 100 ppm; - when N < 10 ppm, Ti + Zr/2 = traces - 100 ppm with Ti + Zr/2 < 10 N; - when 10 ppm < N < 20 ppm, Ti + Zr/2 = traces - 150 ppm; - O = traces - 50 ppm; - N = traces - 20 ppm; - S = traces - 20 ppm; - Cu = traces - 1%; - P = traces - 200 ppm, the remainder being iron and inevitable impurities resulting from the smelting. Process for manufacturing a part from this steel, and part thus obtained.

Acier caractérisé en ce que sa composition est, en pourcentages pondéraux : - C = 0,20 - 0,30% - Co = traces - 1%- Cr=2-5%-Al=1-2%-Mo+W/2=1-4%-V=traces-0,3%-Nb=traces-0,1%-B=traces-30 ppm-Ni=11- 16% avec Ni >= 7 + 3,5 AI - Si = traces - 1,0% - Mn = traces - 2,0% - Ca = traces - 20 ppm - Terres rares = traces - 100 ppm - si N < 10 ppm, Ti + Zr/2 = traces - 100 ppm avec Ti + Zr/2 < 10 N - si 10 ppm < N< 20 ppm, Ti + Zr/2 = traces - 150 ppm - O = traces - 50 ppm - N = traces - 20 ppm - S = traces - 20 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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