METHOD OF MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEETS

摘要

Disclosed is a method of producing grain-oriented electrical steel sheets, which are used as iron core materials for electrical devices, including large-sized rotating machines such as various transformers and electric generators. More specifically, disclosed is a method for producing a grain-oriented electrical steel sheet having excellent magnetic properties, low iron loss, and high magnetic flux density, or at least one of these properties, the method comprising reheating a slab for the grain-oriented electrical steel sheet, hot-rolling the reheated slab to produce a hot-rolled sheet, optionally annealing the hot-rolled sheet, cold-rolling the resulting sheet, subjecting the cold-rolled sheet to simultaneous decarburization and nitriding annealing, and then subjecting the annealed sheet to secondary recrystallization annealing, wherein a vary small amount of N and S are added to the slab, such that AlN and MnS can be produced and completely dissolved in solution in the slab reheating.