Invention Grant
- Patent Title: Method for manufacturing grain-oriented electrical steel sheet having excellent magnetic properties
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Application No.: US13979790Application Date: 2011-12-16
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Publication No.: US09663839B2Publication Date: 2017-05-30
- Inventor: Hyung-Don Joo , Chang-Soo Kim , Jong-Tae Park , Jong-Ho Park , Byeong-Goo Kim , Jin-Wook Seo
- Applicant: Hyung-Don Joo , Chang-Soo Kim , Jong-Tae Park , Jong-Ho Park , Byeong-Goo Kim , Jin-Wook Seo
- Applicant Address: KR Gyeonsangbuk-do
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Gyeonsangbuk-do
- Agency: The Webb Law Firm
- International Application: PCT/KR2011/009704 WO 20111216
- International Announcement: WO2013/089297 WO 20130620
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C21D8/12 ; C21D9/46 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C21D6/00 ; C22C1/02

Abstract:
Provided is a method for manufacturing a grain-oriented electrical steel sheet, the method comprising: heating a grain-oriented electrical steel sheet slab; hot-rolling the heated slab; optionally annealing the hot-rolled steel sheet; subjecting the resulting steel sheet to one cold rolling or two or more cold rollings with intermediate annealing therebetween; subjecting the cold-rolled steel sheet to primary recrystallization annealing; and subjecting the annealed steel sheet to secondary recrystallization annealing, wherein the primary recrystallization annealing sequentially comprises an ultra-rapid heating process of heating the steel sheet at an average heating rate of 300° C./sec or higher, a rapid heating process of heating the steel sheet at a lower average heating rate than the average heating rate of the ultra-rapid heating process, but not lower than 100° C./sec, and a general heating process of heating the steel sheet at a lower average heating rate than the average heating rate of the rapid heating process.
Public/Granted literature
- US20130306202A1 Method for Manufacturing Grain-Oriented Electrical Steel Sheets Having Excellent Magnetic Properties Public/Granted day:2013-11-21
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