发明授权
- 专利标题: Process for production of oriented electrical steel sheet having excellent magnetic properties
- 专利标题(中): 具有优异的磁特性的取向电工钢板的制造方法
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申请号: US948361申请日: 1992-09-21
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公开(公告)号: US5266129A公开(公告)日: 1993-11-30
- 发明人: Masayoshi Minakuchi , Yasumitsu Kondo , Maremizu Ishibashi
- 申请人: Masayoshi Minakuchi , Yasumitsu Kondo , Maremizu Ishibashi
- 申请人地址: JPX Tokyo
- 专利权人: Nippon Steel Corporation
- 当前专利权人: Nippon Steel Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX3-248091 19910926
- 主分类号: C21D3/04
- IPC分类号: C21D3/04 ; C21D8/12 ; C21D9/46 ; C21D11/00 ; C23C8/26 ; C23C8/80 ; H01F1/16 ; H01F1/04
摘要:
A slab for an electrical steel sheet is heated at a temperature of 1280.degree. C. or below and then hot-rolled. The hot-rolled steel sheet or hot rolled and annealed steel sheet is then cold-rolled once or at least twice with intermediate annealing being performed between rollings. The cold-rolled sheet is decarburized and nitrided to form an inhibitor. The amount of nitrogen of in the steel sheet during the nitriding treatment subsequent to the decarburization annealing and the iron loss value after the withdrawal of the steel sheet from the furnace are measured to estimate the average diameter of a primary recrystallized grain, and next decarburization annealing is performed under conditions regulated in such a manner that the average diameter of the primary recrystallized grain of a product sheet falls within a proper range. The steel sheet subjected to the decarburization annealing is coated with an annealing separator composed mainly of MgO and then subjected to finish annealing.