Low alloy steel for the manufacture of moulds for plastics

Details Low alloy steel for the manufacture of moulds for plastics Low alloy steel for the manufacture of moulds for plastics

C - Chemistry, Metallurgy

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C22C 38/04 (2006.01) B23K 35/30 (2006.01) B29C 33/38 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/32 (2006.01) C22C 38/40 (2006.01) C22C 38/44 (2006.01)

Patent

CA 2203488

Acier pour la fabrication de moules pour injection de matières plastiques, caractérisé en ce que sa composition chimique contient, en poids :0,35 % <= C <= 0,5% ; 0%. ltoreq. Si <= 0,5% ; 0,2% <= Mn <= 2,5 % ; 0% <= Ni <= 4% ; 0% <= Cr <= 4 %;0 % <= Mo + W/2 <= 2% ; 0 <= Cu <= 1 % ; 0% <= V + Nb/2 + Ta/4 <= 0,5%; 0,005% <= Al <= 0,2% ; 0% <= B <= 0,015% ; 0% <= Ti + Zr/2 <= 0,3 % ; 0%. ltoreq. S + Se + Te <= 0,2%;0% <= Pb + Bi <= 0,2%;0% <= Ca <= 0,1 % ; le reste étant du fer et des impuretés résultant de l'élaboration. L'analyse satisfaisant, simultanément, les relations suivantes : Cr + 3 × (Mo + W/2) + 10 × (V + Nb/2 + Ta/4)>= 1 ; R=3,8 × C + 10 × Si + 3,3 × Mn + 2,4 × Ni + 1,4 × (Cr + Mo + W/2) <= 11 ; Tr = 3,8 × C + 1,1 × Mn + 0,7 ×Ni + 0,6 × Cr + 1,6 ×(Mo + W12) + kB >= 3, avec kB = 0,5 si B >= 0,0005 % et kB = 0 si non ; et, : R <= Max (2,33 × Tr - 1 ; 0,9 × Tr + 4). Figure : néant

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