HIGHLY-ACCULATE CONTROLLING AND PRODUCING METHOD FOR GRAIN-ORIENTED SILICON STEEL SHEET

摘要

PURPOSE: To produce a grain-oriented silicon steel sheet having extremely low core loss even if stress relieving annealing is executed by generating primary recrystallization under specified conditions, in the production of a grain-oriented silicon steel sheet. ;CONSTITUTION: Steel contg. 1 to 7% Si is melted, and, as fundamental stages, hot-cold rolling and primary-secondary recrystallization annealing are executed to produce a grain-oriented silicon steel sheet. In this production, in accordance with the two-dimensional distribution g (x) of primarily recrystallized grain size, the average primarily recrystallized grain size X_aρ is found by the formula I. In accordance with the formula I, E_aρ is found by the formula II. Furthermore, in accordance with the relational formula III between the two-dimensional distribution g (x) and three-dimensional distribution f (x) of the primarily recrystallized grain size, g (x) is transformed into f (x), and E_aρ/E_s is represented only by f (x) and x shown as the formula IV. Primary recrystallization is generated so as to regulate E_aρ/E_s into ≤1.10. In this way, the grain-oriented silicon steel sheet good in magnetic properties can be obtd.;COPYRIGHT: (C)1994,JPO&Japio