| 摘要 |
PROBLEM TO BE SOLVED: To obtain a grain-oriented silicon steel sheet having a low core loss by specifying the grain size and the componental compsn. of a steel sheet. SOLUTION: As for the grain size of the steel sheet, the area ratio of the grains of >=8 mm grain size is regulated to >=75%, and the average grain size of all crystal grains is regulated to <=25 mm. It has a compsn. contg., by weight, 1.5 to 7.0% Si, furthermore contg., as inhibitor auxiliary components, Mn, Cu, Sn, Ge, Bi, V, Nb, Cr, Te and Mo by 0.005 to 2.5% independently or in the total of >= two kinds, contg. 0.01 to 1.5% Ni, 0.01 to 0.15% Sb and 0 to 0.0050% B, in which, as impurities, the content of C is reduced to <=0.003%, the total content of S and Se to <=0.003%, that of N to <=0.003%, that of Al to <=0.002%, that of Ti to <=0.003% and that of P to <=0.30%, and the balance iron with inevitable impurities. Furthermore, as for the Sb content X and the Ni content Y, X>0.01, Y>0.01 and 0.3-7.5×<Y<1-10X are regulated. |
