HIGH STRENGTH NON-ORIENTED ELECTRIC STEEL HAVING HIGHER MAGNETIC FLUX DENSITY AND MANUFACTURE METHOD THEREOF

摘要

High strength non-oriented electric steel having higher magnetic flux density and manufacture method thereof are disclosed. The method comprises the following steps: 1) smelting and casting, wherein the electric steel, having the components (in wt%) as follows: C =0.0040%, Si 2.50-4.00%, Al 0.20-0.80%, Cr 1.0-8.0%, Ni 0.5-5.0%, Mn =0.50%, P = 0.30%, S =0.0020%, N = 0.0030%, Ti =0.0030%, Nb =0.010%, V = 0.010%, C+S+N+Ti: =0.010% and balance Fe, is subjected to smelting, RH vacuum process and casting; 2) hot rolling; 3) normalizing at a temperature of 850-950? for 0.5-3min, followed by slow cooling to 650-750? at a speed of 5-15?/s and rapid cooling to a temperature below 100? at a speed of 20-70?/s; 4) acid cleaning and cold rolling, wherein the total pressure reduction rate is not less than 70%; 5) annealing at a temperature of 800-1000?, and keeping for 5-60s, then slow cooling to 650-750? at a speed of 3-10?/s and rapid cooling to a temperature below 100? at a speed of 20-70?/s. High strength non-oriented electric steel having high magnetic performance is produced by this method without raising manufacture difficulties.