Process for producing oriented electrical steel sheet having minimized primary film, excellent magnetic properties and good workability.

摘要

A steel sheet is coated with an annealing separator composed mainly of MgO and, added thereto, a sulfur compound and optionally at least one of a Cl compound, a carbonate, a nitrate and a sulfate and subjected to finish annealing in an atmosphere having a limited N2 content to provide an oriented electrical steel sheet having a minimized primary film (a solid substance composed mainly of forsterite), a high magnetic flux density and good workability. Further, the provision of grooves in an intermediate step enables the iron loss to be reduced to a very low value.