发明名称 |
PROCESS FOR PRODUCING UNIDIRECTIONALLY GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET |
摘要 |
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. |
申请公布号 |
EP2140949(A1) |
申请公布日期 |
2010.01.06 |
申请号 |
EP20080740914 |
申请日期 |
2008.04.22 |
申请人 |
NIPPON STEEL CORPORATION |
发明人 |
MUKAI, TAKAO;HAYASHI, SHINYA;TANAKA, ATSUSHI;MIMURA, HIROYUKI;UTO, HISATAKA |
分类号 |
B21B3/02;B21B1/22;C21D8/12;C22C38/00;C22C38/06;C22C38/60;H01F1/16;H01F41/02 |
主分类号 |
B21B3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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