| 摘要 |
<p>PURPOSE:To improve the magnetic properties of a thick grain-oriented silicon steel plate used for iron core for electrical equipment. CONSTITUTION:A slab having a composition consisting of C, Si, acid soluble Al, N, <=0.014% (S+0.405Se), 0.05-0.8% Mn, and the balance Fe with inevitable impurities is heated up to <1280 deg.C and hot-rolled. Subsequently, the resulting hot rolled plate is subjected, without hot rolled plate annealing, to cold rolling at 60-79% reduction of area into a plate of 0.4-1.0mm thickness. Then, the thick grain-oriented silicon steel plate is produced by the known method. At this time, hot rolling finishing temp. is regulated to 600-850 deg.C and cumulative reduction of area in the final three passes in hot rolling is regulated to >=30% and further the average grain size of the primary recrystallized grains after the completion of decarburizing annealing is regulated to 18-30mum, and, in the course between the completion of hot rolling and the initiation of secondary recrystallization in final finish annealing nitriding treatment is applied to the steel plate.</p> |
