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 2506347

The invention concerns a method for making an abrasion-resistant steel part consisting of 0.1 % <= C <= 0.23 %; 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 %; 0.05 % <= Mo +W/2 <= 1 %; 0 % <= B <= 0.02 %; 0 % <= Ti <= 0.67 %; 0 % <= Zr <= 1.34 %; 0.05 % < Ti + Zr/2 <= 0.67 %; 0 % <= S <= 0.15 %; N < 0.030, optionally 0 % to 1.5 % of Cu; optionally Nb, Ta and V such that Nb/2 + Ta/4 + V <= 0.5 %; optionally Se, Te, Ca, Bi, Pb contents <= 0.1 %; the rest being iron and impurities. Additionally: 0.095 % <= C* = C - Ti/4 - Zr/8 + 7xN/8, Ti + Zr/2 - 7xN/2 <= 0.05 % and 1.05xMn + 0.54xNi +0.5OxCr + 0.3x(Mo + W/2)?1/2¿ + K > 1.8, with K = 1 if B >= 0.0005 % and K = 0 if B < 0.0005 %. After austenitization, the method consists in: cooling at a speed > 0.5 ·C/s between AC¿3? and T = 800 - 270xC* - 90xMn -37xNi - 70XCr - 83x(Mo + W/2) and about T-50 ·C; then cooling at a speed 0.1 < Vr < 1150xep?-1.7¿ between T and 100 ·C, (ep = thickness of plate in mm); cooling down to room temperature and optionally planishing. The invention also concerns the resulting plate.

L'invention concerne un procédé pour fabriquer une pièce en acier résistant à l'abrasion de composition: 0,1% < C < 0,23% ; 0%< Si < 2% ; 0% < AI < 2% ; 0,5% < Si + AI < 2% ; 0% < M n< 2,5% ; 0% < Ni < 5% ; 0% < Cr < 5% ; 0% < Mo < 1 % ; 0%< W < 2%; 0,05% < Mo +W/2 < 1 %; 0% < B < 0,02%; 0% < Ti < 0,67%; 0% < Zr < 1,34% ; 0,05% < Ti + Zr/2 < 0,67% ; 0% < S < 0,15% ; N < 0,030, éventuellement de 0% à 1,5% de Cu ; éventuellement Nb, Ta et V tels que Nb/2 + Ta/4 + V< 0,5% ; éventuellement Se, Te, Ca, Bi, Pb en des teneurs < 0,1 % ; reste fer et impuretés. En outre: 0,095% < C* = C - Ti/4 - Zr/8 + 7xN/8, Ti + Zr/2 - 7xN/2 > 0,05% et 1,05xMn + 0,54xNi +0,5OxCr + 0,3x(Mo + W/2)1/2 + K > 1,8, avec K = 1 si B > 0,0005% et K = 0 si B < 0,0005%. Après austénitisation, on refroidit à une vitesse > 0,5~C/s entre AC3 et T = 800 - 270xC* - 90xMn - 37xNi - 70XCr - 83x(Mo + W/2) et T-50~C environ; puis on refroidit à une vitesse 0,1 < Vr < 1150xep-1,7 entre T et 100~C, (ep épaisseur de la tôle en mm) ; on refroidit jusqu'à l'ambiante et on effectue, éventuellement, un planage. Tôle obtenue.

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