- 专利标题: Method for manufacturing grain-oriented electrical steel sheet having excellent magnetic properties
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申请号: US13979790申请日: 2011-12-16
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公开(公告)号: US09663839B2公开(公告)日: 2017-05-30
- 发明人: Hyung-Don Joo , Chang-Soo Kim , Jong-Tae Park , Jong-Ho Park , Byeong-Goo Kim , Jin-Wook Seo
- 申请人: Hyung-Don Joo , Chang-Soo Kim , Jong-Tae Park , Jong-Ho Park , Byeong-Goo Kim , Jin-Wook Seo
- 申请人地址: KR Gyeonsangbuk-do
- 专利权人: POSCO
- 当前专利权人: POSCO
- 当前专利权人地址: KR Gyeonsangbuk-do
- 代理机构: The Webb Law Firm
- 国际申请: PCT/KR2011/009704 WO 20111216
- 国际公布: WO2013/089297 WO 20130620
- 主分类号: C21D8/02
- IPC分类号: C21D8/02 ; C21D8/12 ; C21D9/46 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C21D6/00 ; C22C1/02
摘要:
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.
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