Method for making an abrasion resistant steel plate and...

C - Chemistry – Metallurgy – 21 – D

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C21D 1/19 (2006.01) C22C 38/02 (2006.01) C22C 38/14 (2006.01) C22C 38/44 (2006.01) C22C 38/50 (2006.01) C22C 38/58 (2006.01) C21D 9/46 (2006.01)

Patent

CA 2506349

The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising, by weight: 0.24 % <= C <= 0.35 %; 0 % <= Si <= 2 %; 0 % <= AI <= 2 %; 0.5 % <= Si + AI <= 2 %; 0 % <= Mn <= 2.5 %; 0 % <= Ni <= 5 %; 0 % <= Cr <=< 5 %; 0 % <= Mo <= 1 %; 0 % <=W <= 2 %; 0.1 % <= Mo +W/2 <= 1 %; 0 % <= B <= 0.02 %; 0 % <= Ti <= 1.1 %; 0 % <= Zr <= 2.2 %; 0.35 % <= Ti + Zr/2 <= 1.1 %; 0 % <= S < 0,15 %; N <0,03 %, optionally 0 % to 1,5 % of copper; optionally at least one element selected among Nb, Ta and V in contents such that Nb/2 + Ta/4 + V <= 0.5 %; optionally at least one element selected among Te, Ca, Bi, Pb in contents not more than 0.1 %; the rest being iron and impurities resulting from the preparation, moreover the chemical composition satisfying the following relationships: 0.095 % <= C* = C - Ti/4 - Zr/8 + 7xN/8 and 1.05xMn + 0,54xNi +0.50xCr + 0.3x(Mo + W/2)?112¿ + K > 1.8, with K = 0.5 if B <= 0.0005 % and K = 0 if B < 0.0005 %. The method consists in subjecting the plate to a hardening, in rolling heat or after austenitization in a furnace; cooling the plate at a cooling speed higher than 0.5 ·C/s between a temperature higher than AC¿3? and a temperature ranging between T = 800 - 270xC* - 90xMn -37xNi - 70XCr - 83x(Mo + W/2) and T-50 ·C; then cooling the plate at a core cooling speed Vr < 1150xep?-1.7¿ between temperature T and 100 ·C (ep = plate temperature expressed in mm); cooling the plate down to room temperature and, optionally planishing. The invention also concerns the resulting plate.

La présente invention concerne un procédé pour fabriquer une tôle en acier résistant à l'abrasion dont la composition chimique comprend, en poids : 0,24% < C < 0,35%; 0% < Si < 2%; 0% < AI < 2%; 0,5% < Si + AI < 2%; 0% < Mn < 2,5%; 0% < Ni < 5%; 0% < Cr < 5%; 0% < Mo < 1%; 0% < W < 2%; 0,1% < Mo +W/2 < 1%; 0% < B < 0,02%; 0% < Ti < 1,1%; 0% < Zr < 2,2%; 0,35% < Ti + Zr/2 < 1,1%; 0% < S < 0,15% ; N <0,03 %, éventuellement de 0% à 1,5% de cuivre ; éventuellement au moins un élément pris parmi Nb, Ta et V en des teneurs telles que Nb/2 + Ta/4 + V < 0,5% ; éventuellement au moins un élément pris parmi Se, Te, Ca, Bi, Pb en des teneurs inférieures ou égales à 0,1%; le reste étant du fer et des impuretés résultant de l'élaboration, la composition chimique satisfaisant en outre les relations suivantes : 0,095% < C* = C - Ti/4 - Zr/8 + 7xN/8 et 1,05xMn + 0,54xNi +0,50xCr + 0,3x(Mo + W/2)112 + K > 1,8, avec K = 0,5 si B > 0,0005% et K = 0 si B < 0,0005%. On soumet la tôle à une trempe, dans la chaude de laminage ou après austénitisation dans un four. On refroidit la tôle à une vitesse de refroidissement supérieure à 0,5~C/s entre une température supérieure à AC3 et une température comprise entre T = 800 - 270xC* - 90xMn - 37xNi - 70XCr - 83x(Mo + W/2) et T-50~C; puis on refroidit la tôle à une vitesse de refroidissement à coeur Vr < 1150xep-''' entre la température T et 100~C, ep = épaisseur de la tôle exprimée en mm ; on refroidit la tôle jusqu'à la température ambiante et on effectue, éventuellement, un planage. Tôle obtenue.

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