| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-oriented electromagnetic steel sheet superior in iron loss, having grains of small size and adequate workability before stress relief annealing, of which the crystal grains grow large after the stress relief annealing, and a manufacturing method therefor. SOLUTION: The non-oriented electromagnetic steel sheet with low iron loss and adequate workability, includes 0.010% or less C, 0.05-1.5% Mn, 1.5% or more and 4.0% or less Si+Al, by mass%, and the balance Fe and unavoidable impurity elements, has grain sizes of 50 μm or less, and satisfies N<=5000 in an arbitrary cross-section, when N (piece/mm2) is defined to be the number of precipitates below 0.1 μm. The manufacturing method includes annealing a hot rolled sheet in a condition which satisfies 920+150×[Mn(%)]<=T<=1020+150×[Mn(%)], and, t>=60, when an annealing temperature is T ( deg.C) and a time is t (s), in an annealing process of the hot rolling sheet. |
