GRAIN ORIENTED SILICON STEEL SHEET LOW IN CORE LOSS AND EXCELLENT IN STRAIN RESISTING CHARACTERISTIC AND EXECUTION CHARACTERISTIC, AND MANUFACTURE THEREFOR

摘要

PROBLEM TO BE SOLVED: To obtain a grain oriented silicon steel sheet low in core loss and excellent in strain resisting characteristic and execution characteristic by specifying the ratio of the number of crystal grains with a prescribed grain size on the sheet surface among the crystal grains penetrating in the direction of thickness of the sheet. ;SOLUTION: The component composition of the objective steel sheet is, by weight, 1.5-7.0 % Si and 0.03-2.5% Mn, and the impurities ≤0.003% C and ≤0.002% each of S and N. The important crystal grains of such a sheet penetrate in the direction of thickness of the sheet. Such penetrating grains form many magnetic poles on the grain boundaries and increase big stationary magnetic energy. Regarding the distribution of such penetrating grains, it is an indispensable condition that the ratio of the number of crystal grains with grain size ≤3mm is ≥65% to ≤98%. Such fine grains of ≤3mm, in addition to those of natural generation are preferably arranged artificially and regularly so that the magnetic poles staying on the grain boundaries may be distributed evenly in the sheet and the static magnetic energy distribution may be uniform.;COPYRIGHT: (C)1998,JPO