| 摘要 |
PURPOSE: To produce a grain oriented silicon steel sheet excellent in surface characteristic. CONSTITUTION: A silicon steel slab is heated and hot-rolled. In the as-hot-rolled state or after hot rolled plate annealing, the resulting hot rolled plate is cold- rolled once or is cold-rolled two or more times while process-annealed between cold rolling stages. The resulting cold rolled sheet is subjected to decarburizing annealing and then to finish annealing and successive flattening annealing, by which the grain oriented silicon steel sheet excellent in surface characteristic can be produced. At this time, the oxygen potential (PH2 O/PH2 ) in the atmosphere at the flattening annealing is regulated to >=200. By this method, the grain oriented silicon steel sheet free from dents and having superior external appearance of film can be stably obtained. |
