To provide a method of manufacturing a low iron loss grain-oriented electromagnetic steel sheet greatly increasing the iron loss reducing effect by performing magnetic domain subdivision treatment using a transferred plasma arc greatly increased in controllability of a discharge mark.
In the method of manufacturing the grain-oriented electromagnetic steel sheet that after formation of an insulating film on a surface of the steel sheet containing 1.5-7.0 mass% Si and subjected to secondary recrystallization annealing, the magnetic domain subdivision treatment is performed using the transferred plasma arc, the magnetic domain subdivision treatment is performed by blowing off dilution gas so as to surround the periphery of plasma gas blown off from the tip of a plasma torch and controlling the ratio Gs/Gp of a flow rate Gs of the dilution gas to a flow rate Gp of the plasma gas within a range of 0.15-12 to obtain the low iron loss grain-oriented electromagnetic steel sheet.
OKABE SEIJI
MURAKI MINEO
| JPH06248344A | 1994-09-06 | |||
| JPS6296617A | 1987-05-06 |
Morio Nakamura
Shiro Fujitani
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