MANUFACTURE METHOD OF HIGH EFFICIENCY NON-ORIENTED SILICON STEEL HAVING GOOD MAGNETIC PERFORMANCE.

摘要

Manufacture method of high efficiency non-oriented silicon steel having good magnetic performance is disclosed. The method comprises the following steps: 1) smelting and casting, wherein the non-oriented silicon steel, having the components (in wt%) as follows: C ⿤0.0040%, Si 0.1-0.8%, Al 0.002-1.0%, Mn 0.10-1.50%, P ⿤ 0.2%, Sb 0.04-0.08%, S ⿤ 0.0030%, N ⿤0.0020%, Ti ⿤0.0020%, balance Fe and inevitable impurities, is subjected to smelting and casting to form casting blank; 2) hot rolling, wherein blank heating temperature is 1100⿿-1150⿿ and final rolling temperature is 860-920⿿, air cooling after hot rolling with cooling time of (2+30ÿSb%)s⿤t⿤7s, coiling at condition of ⿥720⿿; 3) acid cleaning and cold rolling, wherein the reduction rate is 70-78%; 4) annealing at a temperature of 800-1000⿿ with heating speed of ⿥15⿿/s, and keeping for 10s-25s. High efficiency electric steel is manufactured in low cost by adding element beneficial for texture, controlling the content of deteriorating elements during steel smelting, controlling the time of air cooling for hot rolling and accompanying high temperature coiling with assuring magnetic performance.