EP 0870843 A1 19981014 - MAGNETIC STEEL SHEET HAVING EXCELLENT MAGNETIC PROPERTIES AND METHOD FOR MANUFACTURING THE SAME
Title (en)
MAGNETIC STEEL SHEET HAVING EXCELLENT MAGNETIC PROPERTIES AND METHOD FOR MANUFACTURING THE SAME
Title (de)
STAHLBLECH MIT HERVORRAGENDEN MAGNETISCHEN EIGENSCHAFTEN UND HERSTELLUNGSVERFAHREN
Title (fr)
TOLE D'ACIER MAGNETIQUE AYANT D'EXCELLENTES PROPRIETES MAGNETIQUES, ET SON PROCEDE DE FABRICATION
Publication
Application
Priority
- JP 9603877 W 19961227
- JP 34174495 A 19951227
Abstract (en)
A grain-oriented electromagnetic steel sheet comprising an electromagnetic steel sheet with recesses, subdividing magnetic domains, formed by irradiating the surface of the electromagnetic steel sheet with a pulsed laser beam, wherein rows of recesses provided along the widthwise direction of the steel sheet are provided at predetermined spacings in the rolling direction and the recesses satisfy the following requirements: length of recesses in rolling direction, dl: 50 mu m ≤ dl ≤ 300 mu m, length of recesses in widthwise direction of sheet, dc: 100 mu m ≤ dc ≤ 3000 mu m, provided that dl/dc < 1 depth of recess, d: 10 mu m ≤ d ≤ 30 mu m, row pitch of recess in rolling direction, Pl: 3 mm ≤ P1 ≤ 10 mm, and pitch of recesses in widthwise direction of sheet, Pc: dc - 50 mu m ≤ Pc ≤ dc + 50 mu m, and a process for producing a grain-oriented electromagnetic steel sheet, characterized by focusing a pulsed laser beam in a rectangular or elliptical form on the surface of an electromagnetic steel sheet to form the recesses.
IPC 1-7
IPC 8 full level
C21D 8/12 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP)
C21D 8/1294 (2013.01); H01F 41/0233 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 9724466 A1 19970710; EP 0870843 A1 19981014; EP 0870843 A4 19981028
DOCDB simple family (application)
JP 9603877 W 19961227; EP 96942675 A 19961227