Bulk steel for the production of injection moulds for...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/44 (2006.01) B22D 17/22 (2006.01) B29C 33/38 (2006.01) B29C 45/37 (2006.01) C22C 38/42 (2006.01) C22C 38/46 (2006.01) C22C 38/58 (2006.01) C22C 38/60 (2006.01)

Patent

CA 2480651

The invention relates to a bulk steel for the production of injection moulds for plastic material or for the production of pieces for working metals with a thickness greater than 20 mm, the structure of which is entirely martensitic or martensite-bainitic, the hardness of which lies between 430 HB and 530 HB and the chemical composition of which is as follows in wt. %: 0.180 % = C = 0.400 %; Si = 0.8 %; Mn = 2.5 %; Ni = 3 %; Cr = 3.5 %; Mo+W/2 = 2.8 %; V + Nb/2 + Ta/4 = 0.5 %; Al = 0.4 %; Ti + Zr/2 = 0.1 %; 0.0005 % < B < 0.015 %, S + Se + Te < 0.2 %, Pb + Bi < 0.2 %, Ca < 0.1 %, the remainder being iron and impurities arising in production. The chemical composition further satisfies the following relationships: 3.2 = Tr = 9; 85 = Dr = 95; U/Dr = 10.0; with: Tr = 1.8xC + 1.1xMn +0.7xNi + 0.6xCr + 1.6xMo* + 0.5; Dr = 54xC?0.25¿ + 24.5x(Mo* + 3xV*)?0.30¿ + 1.58xMn + 0.74xNi + 1.8xSi + 12.5x(Cr)?0.20¿; U = 1600xC + 100x(0.25xCr + Mo* + 4.5xV*); R = 3.8xC + 10xSi + 3.3xMn + 2.4xNi + 1.4x(Cr + Mo*); Mo* + 3xV* = 0.4 %; Mo* = Mo + W/2; V* = V + Nb/2 + Ta/4; et B = 1/3 K¿1? + 0.5; with K¿1? = Min (I*; J*); I* = Max (O; I); J* = Max (O; J); I = Min (N; N-0.29 (Ti + Zr/2 - 5)); Formula F(a).

Bloc en acier pour la fabrication de moules d'injection de matière plastique ou pour la fabrication de pièces pour le travail des métaux d'épaisseur supérieure à 20 mm, dont la structure est entièrement martensitique ou martensito-bainitique, dont la dureté est comprise entre 430 HB et 530 HB et dont la composition chimique comprend, en % en poids : 0,180% <= C <= 0,400% ; Si <= 0,8% ; Mn <= 2,5% ; Ni <= 3% ; Cr <= 3,5% ; Mo+W/2 <= 2,8% ; V + Nb/2 + Ta/4 <= 0,5% ; Al <= 0,4% ; Ti + Zr/2 <= 0,1% ; 0,0005% < B < 0,015%, S + Se + Te < 0,2%, Pb + Bi < 0,2%, Ca < 0,1% ; le reste étant du fer et des impuretés résultant de l'élaboration, la composition chimique satisfaisant en outre les relations suivantes : 3,2 <= Tr <= 9; 85 <= Dr <= 95; U/Dr <= 10.0 ; avec : Tr = 1,8xC + 1,1xMn +0,7xNi + 0,6xCr + 1,6xMo* + 0,5; Dr = 54xC0,25 + 24,5x(Mo* + 3xV*)0,30 + 1,58xMn + 0,74xNi + 1,8xSi + 12,5x(Cr)0,20; U = 1600xC + 100x(0,25xCr + Mo* + 4,5xV*) ; R = 3,8xC + 10xSi + 3,3xMn + 2,4xNi + 1,4x(Cr + Mo*); Mo* + 3xV* >= 0,4%; Mo* = Mo + W/2; V* = V + Nb/2 + Ta/4 ; et B >= 1/3 K1 + 0,5 ; avec K1 = Min (I* ; J*); I* = Max (O ; I); J* = Max (O ; J); I = Min (N ; N-0,29 (Ti + Zr/2 - 5)); Formula F(a).

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