Invention Grant
- Patent Title: Method of producing grain-oriented electrical steel sheet
- Patent Title (中): 生产晶粒取向电工钢板的方法
-
Application No.: US12450996Application Date: 2008-04-22
-
Publication No.: US08236110B2Publication Date: 2012-08-07
- Inventor: Takao Mukai , Shinya Hayashi , Atsushi Tanaka , Hiroyuki Mimura , Hisataka Uto
- Applicant: Takao Mukai , Shinya Hayashi , Atsushi Tanaka , Hiroyuki Mimura , Hisataka Uto
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel Corporation
- Current Assignee: Nippon Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2007-114255 20070424
- International Application: PCT/JP2008/058229 WO 20080422
- International Announcement: WO2008/133337 WO 20081106
- Main IPC: H01F1/147
- IPC: H01F1/147 ; H01F1/16

Abstract:
The invention produces a grain-oriented electrical steel sheet having a primary recrystallization structure in which Goss-oriented crystal grains and crystal grains having a coincidence orientation relationship to the Goss orientation are aligned in the rolling direction. It is characterized heating a slab containing, in mass %, C: 0.025 to 0.10%, Si: 2.5 to 4.5%, Mn: 0.03 to 0.55%, and Al: 0.007 to 0.040% to 1,100 to 1,450° C. or greater; hot rolling the slab to obtain a hot-rolled sheet; annealing the hot-rolled sheet; cold rolling the annealed sheet multiple times with a split-housing reversible cluster rolling mill; and subjecting the cold-rolled sheet to primary recrystallization annealing followed by secondary recrystallization annealing, in which method: (a) a first cold rolling or first and second cold rollings are performed using a small-diameter work roll of 55 mm to less than 105 mm diameter; (b) a second or third cold rolling to a penultimate cold rolling are performed using a large-diameter work roll of 105 mm to less than 150 mm diameter; and (c) a final cold rolling is conducted using a small work roll of a diameter smaller than the diameter of the large-diameter work roll.
Public/Granted literature
- US20100084058A1 METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL Public/Granted day:2010-04-08
Information query