| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent edge cracking which is liable to occur at hot rolling in the case of manufacturing a grain oriented silicon steel sheet containing Bi in combination with Cr together with known inhibitors and to manufacture a grain oriented silicon steel sheet having high magnetic flux density, satisfactory film characteristics and excellent magnetic properties in high production yield. SOLUTION: Prior to the initiation of roughing in hot rolling in the process for manufacturing the grain oriented silicon steel sheet, a steel slab is heated to <1,300 deg.C in an atmosphere of 0.01-15 vol.% average oxygen concentration, subjected to horizontal reduction at 1-20% draft and/or edging at 1-20% draft, and further heated to >=1,350 deg.C in an atmosphere of 0.01-2 vol.% average oxygen concentration while regulating temperature-rise rate at >=1,300 deg.C to <=10 deg.C/min. |
