(19)

(11)

EP 1 521 856 A1

(12)

(43) Date of publication: 13.04.2005 Bulletin 2005/15 (21) Application number: 03741248.3 (22) Date of filing: 07.07.2003

(51) International Patent Classification (IPC)7: C21D 9/08, C22C 38/18, C22C 38/32, C22C 38/24, C22C 38/26, C22C 38/28 (86) International application number: PCT/JP2003/008625 (87) International publication number: WO 2004/007780 (22.01.2004 Gazette 2004/04)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 15.07.2002 JP 2002206169 (71) Applicant: SUMITOMO METAL INDUSTRIES, LTD. Osaka-shi,Osaka 541-0041 (JP)	(72) Inventors: Kidani, Shigeru,c/o Sumitomo Metal Industries, Ltd Osaka-shi,Osaka 541-0041 (JP) Tanida, Mutsumi,c/o Sumitomo Metal Industries, Ltd Osaka-shi,Osaka 541-0041 (JP) (74) Representative: Simons, Amanda Louise  J.A. Kemp & Co.,14 South Square,Gray's Inn London WC1R 5JJ London WC1R 5JJ (GB)