(19)
(11) EP 1 412 548 A1

(12)

(43) Date of publication:
28.04.2004 Bulletin 2004/18

(21) Application number: 02751696.2

(22) Date of filing: 25.07.2002
(51) International Patent Classification (IPC)7: C22C 38/00, C22C 38/02, C22C 38/04, C22C 38/06
(86) International application number:
PCT/JP2002/007568
(87) International publication number:
WO 2003/010351 (06.02.2003 Gazette 2003/06)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

(30) Priority: 25.07.2001 JP 2001224750

(71) Applicant: NIPPON STEEL CORPORATION
Tokyo 100-8071 (JP)

(72) Inventors:
  • KAWANO, Osamu,NIPPON STEEL CORP. OITA WORKS
    Oita-shi, Oita 870-8566 (JP)
  • HOSHINO, Takehiro,NIPPON STEEL CORP. OIT WORKS
    Oita-shi, Oita 870-8566 (JP)

(74) Representative: VOSSIUS & PARTNER 
Siebertstrasse 4
81675 München
81675 München (DE)

   


(54) MULTI-PHASE STEEL SHEET EXCELLENT IN HOLE EXPANDABILITY AND METHOD OF PRODUCING THE SAME