FIELD: metallurgy.
SUBSTANCE: blank is heated to temperature higher than steel austenitising, rough rolling is performed as well as straining-to-straining cooling, finish rolling at 950-770°C for at least 60 s to form nano-sized islands of Nb-Nb, and/or Nb-Ti, and/or Nb-Mo, and/or Mo-Mo in the matrix of paramagnetic cubic face-centred and/or space-centred iron. Then, thermal treatment is performed at 680-450°C for at least 80 s to form nano-sized isolations of Cu-Cu and/or Cu-Ni in the matrix of ferromagnetic cubic space-centred iron.
EFFECT: higher strength.
3 cl, 4 ex
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