Grain-oriented electrical steel sheet and manufacturing method thereof
AssigneeJfe Steel Corporation
InventorsShigehiro Takajo, Hiroi Yamaguchi, Takeshi Omura, Hirotaka Inoue, Seiji Okabe
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Abstract
A grain-oriented electrical steel sheet to which electron beam irradiation is applied, has a film and a thickness of t (mm), wherein no rust is produced on a surface of the steel sheet after a humidity cabinet test lasting 48 hours at a temperature of 50° C. in an atmosphere of 98% humidity, and iron loss W17/50 after the electron beam irradiation is reduced by at least (−500 t2+200 t−6.5) % of the iron loss W17/50 before the electron beam irradiation and is (5 t2−2 t+1.065) W/kg or less.
Claims6
A grain-oriented electrical steel sheet to which electron beam irradiation is applied, having a film and a thickness of t (mm), wherein no rust is produced on a surface of the steel sheet after a humidity cabinet test lasting 48 hours at a temperature of 50° C. in an atmosphere of 98% humidity, and an iron loss W17/50 after the electron beam irradiation is reduced by at least (−500 t2+200 t−6.5) % of the iron loss W17/50 before the electron beam irradiation and is (5 t2−2t+1.065) W/kg or less.
A method of manufacturing a grain-oriented electrical steel sheet having a film, comprising:
- irradiating the grain-oriented electrical steel sheet with an electron beam in a direction intersecting a rolling direction, setting electron beam irradiation conditions such that an irradiation energy of the electron beam per unit area of 1 cm2 is 1.0 Z J to 3.5 Z J and the irradiation energy of the electron beam per unit irradiation length of 1 m is 105 Z J or less, where an irradiation time per irradiation interval d (mm) of the electron beam is S1 (ms), and Z=s10.35.
Dependencies are inferred from the claim text.