FIELD: metallurgy.
SUBSTANCE: said utility invention relates to the field of metallurgy, in particular, to a method of manufacture of sheets of wear-resistant steel and the sheet. To enhance the sheet wear resistance, it is manufactured of steel containing the following components, % 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, if required, 0-1.5 Cu, at least one element from the group of Nb, Ta, V, provided that the ratio Nb/2+Ta/4+V<0.5 is met, if required, at least one element selected from the group Se, Te, Ca, Bi, Pb, with a content less than or equal to 0.1, the remaining being iron and casting impurities, provided that the following ratios are met: C*=C-Ti/4-Zr/8+7×N/8≥0.095 and 1.05×Mn+0.54×Ni+0.50×Cr+0.3×(Mo+W/2)1/2+K>1.8, where K=0.5 if B≥0.0005 and K=0 if B<0.0005. The sheet is hardened using the rolling heat or after austenitisation in the furnace. During hardening, the sheet if cooled first, at a rate exceeding 0.5°C/s, in the range of a temperature exceeding Ac3 to a temperature between T=800-270×C*-90×Mn-37×Ni-70×Cr-83×(Mo+W/2) and T-50°C, after that, with an average rate of Vr<1150×thickness-1.7 in the range between the temperature T and 100°C; where: thickness is the sheet thickness, mm; is cooled finally to the room temperature, and levelled if required.
EFFECT: increase in sheet wear resistance.
7 cl, 1 tbl
