C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/22 (2006.01) C22C 38/06 (2006.01) C22C 38/24 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01) C23C 8/26 (2006.01)
Patent
CA 2312034
The invention concerns a steel composition comprising, expressed in wt.%: 0.2 to 0.4 % of C; 0.8 to 2 % of Cr; 0.6 to 2 % of Mo; 0.05 to 0.4 % of Al; and as the case may be, not more than 0.5 % of Si; not more than 1.5 % of Mn; not more than 1.5 % Ni; not more than 0.5 % of V; the rest consisting of iron and residual impurities; said composition Cr, Mo, V and Al contents expressed in wt.% satisfies the following relationship: 4 ? 3Cr + Mo + V + 2Al ? 8. The invention also concerns a method for making treated and nitrided parts, made of said compositions.
L'invention concerne une composition d'acier comprenant, exprimés en % en poids, 0,2 à 0,4 % de C, 0,8 à 2 % de Cr, 0,6 à 2 % de Mo, 0,05 à 0,4 % de Al, et, le cas échéant, au plus 0,5 % de Si, au plus 1,5 % de Mn, au plus 1,5 % de Ni, au plus 0,5 % de V, le complément étant constitué de fer et d'impuretés résiduelles, les teneurs de cette composition en Cr, Mo, V et Al, exprimées en % en poids, satisfaisant la relation suivante: 4 <= 3Cr + Mo + V + 2Al <=8, ainsi q'un procédé de fabrication de pièces traitées et nitrurées, réalisées dans ces compositions.
Aubert & Duval
Goudreau Gage Dubuc
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