| 摘要 |
<p>The present invention discloses a process for producing a grain-oriented electrical steel strip having a high magnetic flux density. The process comprises hot-rolling a steel ingot comprising basic ingredients and, added thereto, 0.02 to 0.15 % of Sn at a temperature of 1200 DEG C or below, annealing the hot-rolled strip, cold-rolling the annealed strip with a final rolling reduction of 80 % or more and subjecting the cold-rolled strip to decarburization annealing, a nitriding treatment and finish annealing, wherein the temperature, T DEG C, of annealing of the hot-rolled strip is set so as to fall within the range 1240 - 2.1 ô AlR < T < 1310 - 1.8 ô AlR (wherein AlR = acid soluble ÄAlÜ-27/14 ô ÄNÜ) and the strip is soaked for 180 sec or less, maintained at a temperature in the range of from 800 to 950 DEG C for 30 to 300 sec and then quenched. The grain-oriented electrical steel strip thus produced is not influenced by the variation in the ÄAlÜ and ÄNÜ. According to the present invention, a grain-oriented electrical steel strip having a very high magnetic density can be stably prepared through the establishment of a proper relationship between the Al and N ingredients and conditions for annealing of a steel strip before final cold rolling and the growth of a primary recrystallized grain to optimize the annealing conditions and the practice of a nitriding treatment after decarburization annealing. <IMAGE></p> |
