| 摘要 |
PURPOSE:To produce a grain oriented silicon steel sheet having an excellent magnetic characteristic by coating a separating agent for annealing consisting essentially of MgO and added with an adequate amt. of La, Ce, S or the compd. thereof on the surface of a silicon steel sheet and subjecting the sheet to final finish annealing. CONSTITUTION:A hot rolled silicon steel sheet contg. <=4.0wt% Si is subjected to 1 pass or >=2 passes of cold rolling including intermediate annealing to a final thickness and is then subjected to decarburization and primary recrystallization annealing. A separating agent for annealing which consists essentially of MgO and is added with >=1 kind among La, Ce or the compd. thereof at 0.1-3.0% in total in terms of La and Ce with respect to MgO or is further added with S or S compd. at 0.01-1.0% in terms of S with respect to MgO is coated on the surface of the sheet. The steel sheet is then made into a coil shape and is subjected to finish annealing. The formation of coarse crystal grains on the surface of the steel sheet is thus suppressed and the grain oriented silicon steel sheet having excellent magnetic characteristic is obtd. |
