Hardened martensitic steel having a low cobalt content,...

Details Hardened martensitic steel having a low cobalt content,... Hardened martensitic steel having a low cobalt content,...

C - Chemistry, Metallurgy

22

C

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

Patent

CA 2730520

Hardened martensitic steel having a low cobalt content, process for manufacturing a part from this steel, and part thus obtained. The steel is characterized in that its composition is, in percentages by weight: C = 0.180.30%; Co = 1.5 - 4%; Cr = 25%; Al = 12%; Mo + W/2 = 14%; V = traces - 0.3%; Nb = traces - 0.1%; B = traces 30 ppm; Ni = 1116%, where Ni = 7 + 3.5 Al; Si = traces - 1.0%; Mn = traces - 4.0%; Ca = traces - 20 ppm; rare earths = traces 100 ppm; if N = 10 ppm, Ti + Zr/2 = traces 100 ppm, where Ti + Zr/2 = 10N; if 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 balance being iron and inevitable impurities resulting from the smelting. Process for manufacturing a part from this steel, and part thus obtained.

Acier martensitique durci à teneur faible en cobalt, procédé de fabrication d'une pièce à partir de cet acier, et pièce ainsi obtenue. Acier caractérisé en ce que sa composition est, en pourcentages pondéraux: - C = 0,18 - 0,30% - Co = 1,5 - 4% - Cr = 2- 5% - Al =1-2%-Mo+W/2=1-4%-V=traces -0,3%-Nb=traces -0,1%-B=traces - 30ppm - Ni = 11 - 16% avec Ni ~ 7 + 3,5 Al - Si = traces - 1,0% - Mn = traces - 4,0% - 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 - 50ppm - 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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