C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/44 (2006.01) C21D 6/00 (2006.01) C22C 38/42 (2006.01) C22C 38/46 (2006.01) C23C 8/22 (2006.01) F02M 61/16 (2006.01) C21D 1/18 (2006.01) C21D 1/28 (2006.01)
Patent
CA 2335911
The invention concerns a case hardened steel composition comprising, expressed by weight: 0.06 to 0.18 % C; 0.5 to 1.5 % Si; 0.2 to 1.5 % Cr; 1 to 3.5 % Ni; 1.1 to 3.5 % Mo; and, as the case may be: not more than 1.6 % Mn and/or not more than 0.4 % V, and/or not more than 2 % Cu and/or not more than 4 % Co, the rest consisting of iron and residual impurities, said composition contents in Ni, Mn, Cu, Co, Cr, Mo and V, expressed by weight, satisfying the following relationships: 2.5 </= Ni + Mn + 1.5 Cu + 0.5 Co </= 5 (1); 2.4 </= Cr + Mo + V </= 3.7 (2). The invention also concerns a method for making case hardened and treated steel parts, made with said compositions.
L'invention concerne une composition d'acier de cémentation comprenant, exprimés en poids: 0,06 à 0,18 % de C; 0,5 à 1,5 % de Si; 0,2 à 1,5 % de Cr; 1 à 3,5 % de Ni; 1,1 à 3,5 % de Mo; et, le cas échéant, au plus 1,6 % de Mn; et/ou au plus 0,4 % de V; et/ou au plus 2% de Cu, et/ou au plus 4 % de Co, le complément étant constitué de fer et d'impuretés résiduelles, les teneurs de cette composition en Ni, Mn, Cu, Co, Cr, Mo et V, exprimées en poids, satisfaisant aux relations suivantes: (1) 2,5<=Ni+Mn+1,5Cu+0,5Co<=5; (2) 2,4<=Cr+Mo+V<=3,7; ainsi qu'un procédé de fabrication de pièces cémentées et traitées, réalisées dans ces compositions.
Aubert & Duval
Goudreau Gage Dubuc
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