Steel usable for the manufacture of plastic injection moulds

Details Steel usable for the manufacture of plastic injection moulds Steel usable for the manufacture of plastic injection moulds

C - Chemistry, Metallurgy

22

C

C22C 38/00 (2006.01) B23K 35/30 (2006.01) C22C 38/08 (2006.01) C22C 38/42 (2006.01)

Patent

CA 2197532

Steel that may be used among other things for the manufacture of plastic injection molds with a chemical composition that includes, in weight, 0.03% C 0.25%, 0% Si 0.2%, 0% Mn 0.9%, 1.5% Ni 5%, 0% Cr 18%, 0.05% Mo + W/2 1%, 0% S 0.3%, at least one element among Al and Cu in concentrations between 0.5% and 3%, possibly 0.0005% B 0.015%, possibly at least one element from among V, Nb, Zr, Ta and Ti, in concentrations between 0% and 0.3%, possibly at least one element from among Pb, Se, Te et Bi, in concentrations between 0% and 0.3%, the rest being iron and impurities resulting from processing, notably nitrogen, whth the chemical compositions so satisfying the following: Kth = 3.8 x C + 9.8 x Si + 3.3 x Mn + 2.4 x Ni + x Cr + 1.4 x (Mo + W/2) 15, with = 1.4 if Cr < 8% and = 0 if Cr 8%; Tr = 3.8 x C + 1.07 x Mn + 0.7 x Ni + 0.57 x Cr + 1.58 x (Mo + W/2) + kB 3.1, with kB = 0.8 if B is between 0.0005% and 0.015%, and kB = 0 if not; if Cr 5%, Kth / Tr 3. Steel block of hardness greater than 350 HB and solder.

Acier utilisable notamment pour la fabrication de moules pour injection de matières plastiques dont la composition chimique comprend, en poids: 0,03% ~ C ~ 0,25%, 0% ~ Si ~ 0,2%, 0% ~ Mn ~ 0,9%, 1,5% ~ Ni ~ 5%, 0% ~ Cr ~ 18%, 0,05% ~ Mo + W/2 ~ 1%, 0% ~ S ~ 0,3%, au moins un élément pris parmi Al et Cu en des teneurs comprises entre 0,5% et 3%, éventuellement 0,0005% ~ B ~ 0,015%, éventuellement au moins un élément pris parmi V, Nb, Zr, Ta et Ti, en des teneurs comprises entre 0% et 0,3%, éventuellement au moins un élément pris parmi Pb, Se, Te et Bi, en des teneurs comprises entre 0% et 0,3%, le resteétant du fer et des impuretés résultant de l'élaboration, notamment de l'azote; la composition chimique satisfaisant, en outre, les relations: Kth = 3,8 x C + 9,8 x Si + 3,3 x Mn + 2,4 x Ni + .alpha.x Cr + 1,4 x (Mo+W/2) ~ 15, avec .alpha. = 1,4 si Cr < 8% et .alpha. = 0 si Cr ~ 8%; Tr = 3,8 x C + 1,07 x Mn + 0,7 x Ni + 0,57 x Cr + 1,58 x (Mo + W/2) + kB ~ 3,1, avec kB = 0,8 si B compris entre 0,0005% et 0,015%, et kB = 0 si non; si Cr ~ 5 %, Kth / Tr ~ 3. Bloc en acier de dureté supérieure à 350 HB et fil de soudure.

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