Verfahren zur Herstellung nichtorientierter Elektrostahlbleche mit ausgezeichneten magnetischen Eigenschaften

摘要

The present invention relates generally to a non-oriented electrical steel sheet usable as a metallic material for cores incorporated in an electrical apparatus, an electrical equipment or the like and the non-oriented electrical steel sheet is produced, by which a steel slab having a composition comprising Si: 0.1% or more but less than 1.5%, Al: 0.3% or more to 2.0% or less and Si + 2Al: 2.0% or more is hot rolled; the hot-rolled steel plate is annealed at a temperature ranging from 1000 to 1200 DEG C; the annealed hot-rolled steel sheet is cold rolled at a reduction ratio ranging from 85 to 95%, and subsequently, the cold-rolled steel sheet is subjected to finish annealing under conditions of a temperature ranging from 750 to 1000 DEG C and a time longer than 15 seconds but shorter than 2 minutes.