Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2007-10-16
2007-10-16
Sheehan, John P. (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S110000, C148S111000, C148S112000
Reexamination Certificate
active
10519521
ABSTRACT:
A method for manufacturing a high silicon grain-oriented electrical steel sheet. In a method for manufacturing a high silicon grain-oriented electrical steel sheet, comprising the steps of: reheating and hot-rolling a steel slab to produce a hot-rolled steel sheet; annealing the hot-rolled sheet and cold rolling the annealed steel sheet so as to adjust a thickness of the steel sheet; decarburization annealing the cold rolled steel sheet; and finish-annealing the decarburization annealed steel sheet for secondary recrystallization, the improved method further comprising the step of: coating a powder coating agent for siliconization on a surface of the decarburization annealed steel sheet in a slurry state, the powder coating agent including 100 part by weight of MgO powder and 0.5-120 part by weight of sintered powder of Fe—Si compound containing 25-70 wt % Si sintered powder, the sintered powder having a grain size of −325 mesh; drying the resultant decarburization annealed steel sheet; and finish annealing the steel sheet under a conventional condition.
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Patent Abstracts of Japan, JP62096615, published May 6, 1987, entitled “Manufacture of Grain Oriented Electrical Sheet Superior in Magnetic Characteristic and Less in Ear Cracking at Hot Rolling”, Applicant: Nippon Steel Corp.
Choi Kyu-Seung
Kim Jae-Kwan
Woo Jong-Soo
Posco
Sheehan John P.
The Webb Law Firm P.C.
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