Patent ID: 11898215
Assignee: NIPPON STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 6:
7. A method for manufacturing the grain-oriented electrical steel sheet according to claim 1, the method comprising:
forming the intermediate layer and the insulation coating on the base steel sheet which does not have a forsterite film and has a texture developed in a {110}<001> orientation;
forming a groove in the base steel sheet on which the intermediate layer and the insulation coating are formed; and
further forming the intermediate layer and the insulation coating on the base steel sheet in which the groove is formed,
wherein, in at least the final forming of the insulation coating,
an insulation coating forming solution is applied to the base steel sheet, and the base steel sheet is soaked in a temperature range of 800° C. or higher and 1000° C. or lower for 10 seconds or more and 120 seconds or less in an atmosphere gas containing hydrogen and nitrogen and having an oxidation degree of PH2O/PH2 adjusted to 0.001 or more and 0.15 or less, and
the soaked base steel sheet is cooled to 500° C. at a cooling rate of 5° C./sec or more and 30° C./sec or less.