Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2004-03-05
2008-10-28
Sheehan, John P. (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S110000, C148S112000, C148S113000, C148S120000
Reexamination Certificate
active
07442260
ABSTRACT:
The present invention provides a grain-oriented electrical steel sheet with an extremely low core loss by scanning by a small focused laser beam spot and a method of production of the same, that is, a grain-oriented electrical steel sheet improved in electrical characteristics by scanning by a continuous wave fiber laser of the TEM00mode with a wavelength λ of 1.07≦λ≦2.10 μm substantially perpendicular to the steel sheet rolling direction and at substantially constant spacing and a method of production of the same, wherein a rolling direction focused spot diameter d (mm) of the irradiated beam, a linear scan rate V (mm/s) of the laser beam, an average output P (W) of the laser, a width of the formed laser scribing traces or with of the electrical domains Wl (mm), and a rolling direction Pl (mm) of the laser scribing traces are in the following ranges:in-line-formulae description="In-line Formulae" end="lead"?0<d≦0.20in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.001≦P/V≦0.012in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0<Wl≦0.20in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.5≦Pl≦11.0.in-line-formulae description="In-line Formulae" end="tail"?
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Hamada Naoya
Hamamura Hideyuki
Sakai Tatsuhiko
Kenyon & Kenyon LLP
Nippon Steel Corooration
Sheehan John P.
LandOfFree
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