Cold-working steel

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/24 (2006.01) C22C 33/02 (2006.01)

Patent

CA 2644363

11905 22 ABSTRACT The invention relates to a cold-working steel having the following chemical composition in % by weight: 1.3 - 2.4 (C+N), whereof at least 0.5 C, 0.1 - 1.5 Si, 5 0.1 - 1.5 Mn, 4.0 - 5.5 Cr, 1.5 - 3.6 (Mo+W/2), but max 0.5 W, 4.8 - 6.3 (V+Nb/2), but max 2 Nb, and max 0.3 S, 10 in which the content of (C+N) on the one hand and of (V+Nb/2) on the other hand, are balanced in relation to each other such that the contents of these elements are within an area that is defined by the coordinates A, B, C, D, A in the system of coordinates in Fig. 11, where the coordinates of [(C+N), (V+Nb/2)] for these points are: A: [1.38, 4.8] 15 B: [1.78, 4.8] C: [2.32, 6.3] D: [1.92, 6.3], balance essentially only iron and impurities at normal contents.

La présente invention concerne un acier pour travail à froid qui présente la composition chimique suivante en % en poids : 1,3 ~ 2,4 (C+N), dont au moins 0,5 C, 0,1 ~ 1,5 Si, 0,1 ~ 1,5 Mn, 4,0 ~ 5,5 Cr, 1,5 ~ 3,6 (Mo+W/2), mais au maximum 0,5 W, 4,8 ~ 6,3 (V+Nb/2), mais au maximum 2 Nb, et au maximum 0,3 S, dans lequel les teneurs en (C+N) d'une part et en (V+Nb/2) d'autre part sont équilibrées l'une par rapport à l'autre de façon à ce que les teneurs en ces éléments soient comprises dans une surface définie par les coordonnées A, B, C, D, A dans le système de coordonnées de la Fig. 11, les coordonnées de [(C+N), (V+Nb/2)] pour ces points étant : A : [1.38, 4.8] B: [1.78, 4.8] C: [2.32, 6.3] D: [1.92, 6.3], le reste de la composition étant essentiellement constitué de fer et d'impuretés à des teneurs habituelles.

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