Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2011-07-12
2011-07-12
Sheehan, John P (Department: 1736)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S308000
Reexamination Certificate
active
07976644
ABSTRACT:
The present invention provides a method of production of grain-oriented electrical steel sheet comprising making a slab heating temperature 1280° C. or less, annealing hot rolled sheet by (a) a process of heating it to a predetermined temperature of 1000 to 1150° C. to cause recrystallization, then annealing by a temperature lower than that of 850 to 1100° C. or by (b) decarburizing in annealing the hot rolled sheet so that a difference in amounts of carbon of the steel sheet before and after annealing the hot rolled sheet becomes 0.002 to 0.02 mass % and performing the heating in the temperature elevation process of the decarburization annealing under conditions of a heating rate of 40° C. or more, preferably 75 to 125° C./s while the temperature of the steel sheet is in a range from 550° C. to 720° C. and utilizing induction heating for rapid heating in the temperature elevation process of decarburization annealing.
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Fujii Norikazu
Ishibashi Maremizu
Kimura Takeshi
Nakamura Shuichi
Ushigami Yoshiyuki
Kenyon & Kenyon LLP
Nippon Steel Corporation
Sheehan John P
LandOfFree
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