PURPOSE: To manufacture a grain oriented magnetic steel sheet superior in magnetic characteristic by applying decarburization annealing to a magnetic silicon steel sheet, then coating an annealing separator agent contg. MgO as the main component and TiO2, SrS, CuS, etc. thereon and performing the finishing annealing.
CONSTITUTION: The magnetic steel hot rolled plate contg. 0.030W0.100% C, 2.5W 4.0% Si and at least one among sulfide and nitride as inhibitor of primary recrystallized grain is cold rolled to the finished sheet thickness. Next, said sheet is decarburization annealed to form an oxide film contg. SiO2. Thereafter, the annealing separator agent in which 0.5W10 part TiO2 or TiO, 0.1W5.0 part of ≥one kind among SrS, SnS, CuS are combined against 100wt. part MgO, if necessary, further 0.05W2.0 part antimony sulfate is combined, is coated on the oxide film, and finishing annealing is performed. in this way, the grain oriented magnetic steel sheet superior in exciting characteristic, iron loss characteristic and having good glass state insulator film is obtained stably.
HIROMAE YOSHITAKA
TAKADA TOSHIHIKO
SAKAGUCHI KUNIAKI
Next Patent: EXTERNAL PARTS FOR TIMEPIECE