Electrical steel sheet and its manufacturing method, rotor motor core and its manufacturing method, stator motor core and its manufacturing method, and motor core manufacturing method

摘要

To provide an electromagnetic steel that suppresses decrease in magnetic flux density during annealing for removing distortions and a method of producing the same.SOLUTION: An electromagnetic steel contains Si of 2.0 mass% or more and 4.5 mass% or less and Mn of 2.5 mass% or more and 5.0% mass or less, and further contains at least one element selected from Ca, Mg, Ce, Ti, Ba, and Be in a total of 0.0001 mass% or more and 0.1 mass% or less, with Al of less than 0.03 mass%, C of less than 0.002 mass%, and S of less than 0.002 mass%, the steel having Fe as the main component. The steel has an average crystal grain size of 60 μm or more and 80 μm or less.SELECTED DRAWING: Figure 1