FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy. Steel plate is manufactured containing the following in wt %: 0.6 ≤ C ≤ 0.9, 17 ≤ Mn ≤ 22, 0.2 ≤ Al ≤ 0.9%, 0.2 ≤ Si ≤ 1.1, provided 0.85 ≤ Al+Si ≤ 1.9, 1.2 ≤ Cu≤ 1.9, S ≤ 0.030, P ≤ 0.080, N ≤ 0.1, if necessary: Nb ≤ 0.25, preferably 0.070-0.25, V ≤ 0.5, preferably 0.050-0.5, Ti ≤ 0.5, preferably 0.040-0.5, Ni ≤ 2, traces ≤ Cr ≤ 2, preferable ≤ 1, B ≤ 0.010, preferably 0.0005-0.010, iron and inevitable admixture - rest, its casting in form of the slab, slab heating to 1100-1300°C, slab hot rolling with temperature of rolling end at least 890°C, quick cooling of hot rolled plate with rate at least 40°C/s with holding between end of rolling and start of cooling performed such that points specified by the mentioned holding and temperature of rolling end will be inside the area determined by ABCD'E'F'A diagram, preferably ABCDEFA, see Fig. 1, at that during holding time the plate is naturally cooled in air, plate is coiled at temperature below or equal to 580°C. Roll of the hot rolled plate is uncoiled, and at least one cycle of cold rolling is performed with annealing to produce the cold rolled plate. Hot rolled or cold rolled plate is used in automotive industry.
EFFECT: assurance of high mechanical properties, well plastic deformation and high corrosion resistance.
13 cl, 2 tbl, 1 dwg
