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(11)

EP 2 054 533 A1

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(43) Date of publication: 06.05.2009 Bulletin 2009/19 (21) Application number: 06824112.4 (22) Date of filing: 12.12.2006

(51) International Patent Classification (IPC):  C21C 7/00(2006.01) (86) International application number: PCT/KR2006/005406 (87) International publication number: WO 2008/023863 (28.02.2008 Gazette 2008/09)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 23.08.2006 KR 20060079692 23.08.2006 KR 20060079693 (71) Applicant: Posco Co., Ltd. Kyungsangbook-do 790-300 (KR)	(72) Inventors: HONG, Ki Kun Pohang Kyungsangbuk-do 791-754 (KR) CHO, Sung Woan Pohang Kyungsangbuk-do 790-752 (KR) LEE, Hee ho Pohang Kyungsangbuk-do 790-751 (KR) KIM, Dong sik Gyeongju Kyungsangbuk-do 780-873 (KR) PARK, Joo Hyun Pohang Kyungsangbuk-do 791-792 (KR) (74) Representative: Zech, Stefan Markus et al Meissner, Bolte & Partner GbR Postfach 86 06 24 81633 München 81633 München (DE)