| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-oriented electrical steel sheet remarkably improved in magnetic properties in the rolling direction by a method superior in cost and productivity. <P>SOLUTION: The non-oriented electrical steel sheet excellent in rolling direction comprises, by wt.%, Si in an amount of 2.0% or less, Mn in 3.0% or less, Al in 1.0 to 3.0%, Sn, Sb, Cu, Ni, Cr, P, REM, Ca, and Mg in a total of 0.002 to 0.5%, and a balance of Fe and unavoidable impurities and has a ratio (B50<SB>L</SB>/Bs) of B50<SB>L</SB>of the magnetic flux density B50<SB>L</SB>in the rolling direction after stress relief annealing and a saturated magnetic flux density Bs of 0.85 or more and a core loss W15/50<SB>L</SB>2.0 W/kg or less, and is produced by the method of annealing the hot band at 800 to 1,100°C for 30 seconds or more to achieve a crystal grain size after final annealing of 50 μm or less, skin pass rolling the sheet by a reduction of 3 to 10%, then stress relief annealing it. Further, a cold rolling reduction of 60 to 75% is preferable. <P>COPYRIGHT: (C)2007,JPO&INPIT |
