ELECTROMAGNETIC STEEL SHEET

摘要

An electromagnetic steel sheet which can be excited at a high frequency and has a core having improved direct current superimposition properties. The electromagnetic steel sheet has an element composition comprising less than 0.010 mass% of C 1.5 to 10 mass% of Si and a remainder made up by Fe and unavoidable impurities wherein the main orientation in the aggregate structure of the steel sheet is <111>//ND and the random strength ratio in the main orientation is 5 or more preferably the random strength ratio in the orientation of {111}<112> is 10 or more more preferably the random strength ratio in the orientation of {310}<001> is 3 or less and still more preferably the Si concentration has such a concentration gradient that the Si concentration is higher on a front surface layer side and is lower in the center part when observed in the thickness direction wherein the maximum value of the Si concentration is 5.5 mass% or more and the difference between a highest value and a lowest value of the Si concentration is 0.5 mass% or more.