Herstellungsverfahren und Herstellungsanlage für Orientiertes Elektromagnetisches Stahlblech

Details

Veröffentlichungs-Nr.

EP4772654

Anmeldetag

31. Oktober 2024

Veröffentlichung

8. Mai 2025

Rechtsraum

EP

Abstract

Provided is a method of producing a grain-oriented electrical steel sheet that can greatly improve manufacturability, and a production line that can realize this method. In the method of producing a grain-oriented electrical steel sheet, a steel slab having a defined chemical composition is hot-rolled, followed by hot-rolled sheet annealing, followed by cold rolling once or twice or more from a thickness of an obtained hot-rolled sheet to a thickness of a product for a total rolling reduction of 80 % or more, followed by primary recrystallization annealing, followed by application of an annealing separator to the steel sheet surface, followed by final annealing and flattening annealing for flattening. In this method, an occupancy rate of carbides relative to grain boundaries of recrystallized grains in the hot-rolled sheet after the hot-rolled sheet annealing, before cold rolling, is 80 % or more, and an initial rolling reduction in the cold rolling has a strain rate of 200/s or less, a rolling reduction of 30 % or less, and a steel sheet temperature at roll bite of 90 °C or lower.

Anmelder

Firma

JFE Steel Corporation

Land

🇯🇵 Japan