| 摘要 |
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 % 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 AC3 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.
|
