Patent ID: 7887646

Claim:
Oriented magnetic steel plate with excellent coating adhesion comprising an oriented magnetic steel plate produced by a method including the steps of: annealing a hot rolled oriented magnetic steel plate containing, by mass %, C: 0.10% or less, Si: 1.8 to 7%, Mn: 0.02 to 0.30%, a total of one or more of S and Se: 0.001 to 0.040%, acid soluble Al: 0.010 to 0.065%, N: 0.0030 to 0.0150%, Bi: 0.0005 to 0.05 and the balance of Fe and unavoidable impurities; cold rolling the annealed steel plate at least once, with process annealing in between cold rolling steps, thereby finishing the plate to a final thickness, decarburization annealing the cold rolled steel plate, then coating the steel plate surface with an annealing separator, drying the annealing separator, and then final annealing the coated steel plate, and a primary coating on the surface of said oriented magnetic steel plate having forsterite as its main ingredient, one or more of Ce, La, Pr, Nd, Sc, and Y in an areal weight per side of 0.001 to 1000 mg/m 2 , Ti in an areal weight per side of 1 to 800 mg/m 2 , and one or more of Sr, Ca, and Ba in an areal weight per side of 0.01 to 100 mg/m 2 .