| 摘要 |
In accordance with the present invention, there can be provided a method for manufacturing a directional magnetic steel sheet having exceptional magnetic characteristics through a series of steps for manufacturing directional magnetic steel sheets in which steel slabs of a prescribed composition are brought to a final thickness, and then subjected to primary recrystallization annealing and nitriding; wherein the nitriding treatment is carried out in at least two temperature stages; i.e., high-temperature nitriding and low-temperature nitriding, the residence time during the high-temperature nitriding being from 3 to 600 seconds, inclusive, whereby nitrogen is efficiently diffused throughout the steel in the steel sheet prior to secondary recrystallization, and AlN is precipitated. |
