| 摘要 |
The invention concerns a method for making an abrasion resistant steel plate having a chemical composition corn prising, by weight: 0,24% C<0,35%, 0% Si 2%, 0% Al 2%, 0,5 Si+Al 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)1/2+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 austemtization in a furnace, cooling the plate at a cooling speed higher than 0.5 DEGREE 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 DEGREE C, then cooling the plate at a core cooling speed Vr<1150xep-1.7 between temperature T and 100 DEGREE C (ep=plate temperature expressed in mm), cooling the plate down to room temperature and, optionally planishing. The invention allows to improve the increase the stress-strain properties of the obtained steel plate, in particular to increase its bondability and possibility of cutting.
|
