(19)

(11)

EP 1 706 514 A1

(12)

(43) Date of publication: 04.10.2006 Bulletin 2006/40 (21) Application number: 05704017.2 (22) Date of filing: 17.01.2005

(51) International Patent Classification (IPC):  C21D 8/04(2006.01) C21D 1/76(2006.01) C21D 9/46(2006.01) C22C 38/00(2006.01) (86) International application number: PCT/JP2005/000796 (87) International publication number: WO 2005/068667 (28.07.2005 Gazette 2005/30)

(84) Designated Contracting States: BE DE ES FR GB (30) Priority: 19.01.2004 JP 2004011139 (71) Applicant: NIPPON STEEL CORPORATION Tokyo 100-8071 (JP)	(72) Inventors: MURAKAMI, Hidekuni, c/o Nippon Steel Corporation Kitakyushu-shi, Fukuoka 804-0001 (JP) HIRANO, Shigeru, c/o Nippon Steel Corporation Kitakyushu-shi, Fukuoka 804-0001 (JP) ENOMOTO, Akihiro, c/o Nippon Steel Corporation Kitakyushu-shi, Fukuoka 804-0001 (JP) (74) Representative: Vossius & Partner  Siebertstrasse 4 81675 München 81675 München (DE)