| 摘要 |
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+7N/8>=0.095 and 1.05Mn+0.54Ni+0.50Cr+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 0.5C/s, in the range of a temperature exceeding Ac3 to a temperature between T=800-270C*-90Mn-37Ni-70Cr-83(Mo+W/2) and T-50C, after that, with an average rate of Vr<1150thickness-1.7 in the range between the temperature T and 100C; 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 |
