C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/06 (2006.01) C22C 38/04 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C22C 38/16 (2006.01) C22C 38/60 (2006.01)
Patent
CA 2667291
Disclosed is a forging steel having excellent cool and hot forging properties. The forging steel comprises the following components (by mass): C: not less than 0.001% and less than 0.07%; Si: 3.0% or less; Mn: 0.01-4.0%; Cr: 5.0% or less; P: 0.2% or less; S: 0.35% or less; Al: 0.0001-2.0%; N: 0.03% or less; and one or two components selected from 0.5% or less (including 0%) of Mo and 4.5% or less (including 0%) of Ni, with the remainder being iron and unavoidable impurities, and has a Di value as calculated in accordance with the following formula (1) of 60 or greater. Di = 5.41xDi(Si)xDi(Mn)xDi(Cr)xDi(Mo)xDi(Al) ~~~(1)
La présente invention concerne un acier à forger doté de remarquables propriétés en matière de forgeage à froid et à chaud. Ledit acier à forger comprend les composants suivants (en poids) : C, au minimum 0,001 % et au maximum 0,07 % ; Si, 3,0 % au maximum ; Mn, 0,01 à 4,0 % ; Cr, 5,0 % au maximum ; P, 0,2 % au maximum ; S, 0,35 % au maximum ; Al, 0,0001 à 2,0 % ; N, 0,03 % au maximum ; et un ou deux composants choisis parmi 0,5 % au maximum (dont 0 %) de Mo et 4,5 % au maximum (dont 0 %) de Ni, le reste correspondant à du fer et aux inévitables impuretés. Il présente une valeur Di, telle que calculée conformément à la formule (1) suivante, supérieure ou égale à 60. Di = 5,41 x Di(Si) x Di(Mn)x Di(Cr) x Di(Mo) x Di(Al) ~~~(1)
Hashimura Masayuki
Ochi Tatsuro
Saitoh Hajime
Goudreau Gage Dubuc
Nippon Steel Corporation
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