| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: steel includes the following components, wt %: C 0.020.15, Mn - 1.202.0, Si - 0.100.50, Nb - 0.0100.10, Al - 0.010.07, Ti - 0.0050.04, N - 0.0030.012, S - 0.00050.010, P - 0.0010.015, Fe - the rest; continuous pouring on workpieces, heating of slabs, preliminary and final rolling and accelerated cooling; at that, after heating slabs are pre-rolled with total deformation of 50-70% in the direction perpendicular to slab axis. Then, final rolling is performed first in the direction perpendicular to the axis, and then along the roll axis with total deformation of 65-80% at temperature of 900-750C; at that, 30-40% of total deformation falls on rolling in the direction perpendicular to roll axis; after that, accelerated cooling is performed from temperature Ar320C to temperature of 600-400C, and then, slow cooling is performed to temperature of 20-200C at speed of 0.05-0.15 deg/s. Steel also includes one or several elements of the group, wt %: Mo - 0.050.35, V - 0.010.15, Ni - 0.100.50, Cu - 0.10.50, Cr - 0.10.50, Ca - 0.00020.005. ^ EFFECT: increasing strength, cold resistance and low-temperature viscosity of rolled plate, excluding anisotropy of properties as to impact strength in longitudinal and transverse direction of the rolled plate. ^ 2 cl, 1 ex, 3 tbl |
