C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 1/19 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/14 (2006.01) C22C 38/44 (2006.01) C22C 38/50 (2006.01) C21D 9/46 (2006.01)
Patent
CA 2506351
The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.35 % <= C <= 0.8 %, 0 % <= Si <= 2 %; 0 % <= AI <= 2 %; 0.35 % <= Si + AI <= 2 %; 0 % <= Mn <= 2.5 %; 0 % <= Ni <= 5 %; 0 % <= Cr <= 5 %; 0 % <= Mo <= 0.050; 0 % <= W <= 1 %; 0,1 % <= Mo +W/2 <= 0.5 %; 0 % <= B <= 0.02 %; 0 % <= Ti <= 2 %; 0 % <= Zr <= 4 %; 0.05 % <= Ti + Zr/2 <= 2 %; 0 % <= S <= 0.15 %; N <= 0,03; optionally 0 % to 1.5 % of Cu; optionally Nb, Ta or V with Nb/2 + Ta/4 + V <= 0.5 %; optionally less than 0.1 % of Se, Te, Ca, Bi or Pb; the rest being iron and impurities; the composition satisfying: 0.1 % < C* = C - Ti/4 - Zr/8 + 7xN/8 <= 0.55 % and 1.05xMn + 0.54xNi +0.5OxCr + 0.3x(Mo + W/2)?1¿"?2¿ + K > 1.8, with K = 0.5 if B >= 0.0005 % and K = 0 if B < 0.0005 % and Ti+Zr/2-7xN/2 >= 0.05 %; hardening after austenitization while cooling at a speed > 0,5 ·C/s between a temperature > AC¿3? and ranging between T = 800 - 270xC* - 9OxMn -37xNi - 70XCr - 83x(Mo + W/2) and T-50 ·C; then at a core speed Vr < 1150xep?-1.7¿ between T and 100 ·C, (ep = plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate
L'invention concerne un procédé pour fabriquer une tôle en acier résistant à l'abrasion de composition chimique: 0,35% < C < 0,8%, 0% < Si < 2%; 0% < AI < 2%; 0,35% < Si + AI < 2%; 0% < Mn < 2,5%; 0% < Ni < 5%; 0% < Cr < 5%; 0% < Mo < 0,050; 0% < W < 1%; 0,1% < Mo +W/2 < 0,5%; 0% < B < 0,02%; 0% < Ti < 2%; 0% < Zr < 4%; 0,05% < Ti + Zr/2 < 2% ; 0% < S < 0,15%; N< 0,03; éventuellement de 0% à 1,5% de Cu ; éventuellement Nb, Ta ou V avec Nb/2 + Ta/4 + V < 0,5% ; éventuellement moins de 0,1 % de Se, Te, Ca, Bi ou Pb; reste étant du fer et des impuretés ; la composition satisfaisant: 0,1 % < C* = C - Ti/4 - Zr/8 + 7xN/8 < 0,55% et 1,05xMn + 0,54xNi +0,5OxCr + 0,3x(Mo + W/2)1"2 + K > 1,8, avec K = 0,5 si B > 0,0005% et K = 0 si B < 0,0005% et Ti+Zr/2-7xN/2 > 0,05%. On trempe après austénitisation avec une refroidissement à une vitesse > 0,5~C/s entre une température > AC3 et comprise entre T = 800 - 270xC* - 9OxMn -37xNi - 70XCr - 83x(Mo + W/2) et T-50~C; puis à une vitesse à coeur Vr < 1150xep-17 entre T et 100~C, ep = épaisseur de la tôle en mm ; on refroidit jusqu'à la température ambiante. Tôle obtenue.
Beguinot Jean
Brisson Jean-Georges
Industeel Creusot
Robic
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