METHOD FOR MANUFACTURE OF ANISOTROPIC ELECTRIC SHEET STEEL Russian patent published in 2004 - IPC

FIELD: ferrous metallurgy. SUBSTANCE: method involves melting steel; providing continuous pouring; hot rolling; preparing for cold rolling; first cold rolling; decarburizing annealing; second cold rolling on reversible quatro mill; degreasing; applying protective coating; high-temperature annealing; applying electrically insulating coating and flattening high-temperature annealing. Second cold rolling process is carried out by at least two passes, with rolling during first pass being carried out to provide for thickness of h₁, determined from ratio: h₁ = (1,0÷1,2)×D_o×10^-3 (mm), where D_o is diameter of operating rolls of quatro mill (mm), which is 300-600 mm. Method allows anisotropic electric sheet steel having thickness not in the excess of 0.30 mm to be produced. Such steel may be used for manufacture of large-sized magnetic circuits with low power losses for magnetic reversal. EFFECT: increased quality and improved electromagnetic properties of anisotropic sheet steel. 2 cl, 1 tbl, 1 ex