Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2005-12-20
2010-12-07
Sheehan, John P (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S307000
Reexamination Certificate
active
07846271
ABSTRACT:
The present invention relates to technology for manufacturing electrical steel sheets having excellent magnetic properties through the control of a hot-rolled texture using the phase transformation of steel. More particularly, it relates to a non-oriented electrical steel sheet that has reduced iron loss and increased magnetic flux density by controlling alloy component elements and optimizing hot-rolling conditions, even though hot-rolled sheet annealing is not carried out, as well as a manufacturing method thereof. More specifically, the invention provides a non-oriented electrical steel sheet which has excellent magnetic properties while hot-rolled sheet annealing can be omitted, the steel sheet being comprised of 0.005 wt % or less of C, 1.0-3.0 w % of Si, 0.1-2.0 wt % of Mn, 0.1 wt % or less of P, 0.1-1.5 wt % of Al, and a remainder of Fe and other inevitable impurities, in which the relationship between the elements Mn and Al satisfies an equation of −0.2<m(=Mn−Al)<1.0, and a slab for the steel sheet, when reheated, has a two-phase region of austenite+ferrite at a temperature ranging from ArI to 1250° C.
REFERENCES:
patent: 6139650 (2000-10-01), Oda et al.
patent: 2006/0124207 (2006-06-01), Takashima et al.
patent: 0709762 28 (1995-04-01), None
patent: 1020030052139 (2003-06-01), None
patent: WO 9308313 (1993-04-01), None
patent: WO 0168925 (2001-09-01), None
English-language abstract of Japanese Patent Publication No. JP 07-097628, published Apr. 11, 1995, esp@cenet database.
English-language abstract of Korean Patent Publication No. KR 10-2003-0052139, published Jun. 26, 2003, esp@cenet database.
Bae Byung-Keun
Choi Jae-Young
Kim Jae-Kwan
Park Chel-Min
Park Jong-Tae
Cooper & Dunham LLP
Posco Co., Ltd.
Sheehan John P
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