Electrical steel sheet suitable for compact iron core and manufacturing method therefor

Abstract

Electrical steel sheets having superior magnetic properties, anti-noise properties, and workability, are ideal for use a compact iron core material in electric apparatuses, such as compact transformers, motors, and electric generators. A totally new electrical steel sheet and a manufacturing method therefor are proposed, in which the electrical steel sheet is not only most advantageous in magnetic properties but also advantageous from economic point of view. That is, the electrical steel sheet of the present invention is composed of from about 2.0 to 8.0 wt % Si, from about 0.005 to 3.0 wt % Mn, from about 0.0010 to 0.020 wt % Al, balance essentially iron. The magnetic flux density B50(L) in a rolling direction and the magnetic flux density B50(C) in the direction perpendicular thereto are 1.70 T or more, and the B50(L)/B50(C) is 1.005 to 1.100. In addition, the secondary recrystallized grains inclined by 20′ or less with respect to the {100}<001> orientation are present in the steel sheet at an areal ratio of 50 to 80%, and secondary recrystallized grains inclined by 20° or less with respect to the {110}<001> orientation are present in the steel sheet at an areal ratio of 6 to 20%.

Dependencies are inferred from the claim text.