(19)

(11)

EP 2 193 212 A2

(12)

(88) Date of publication A3: 07.05.2009 (43) Date of publication: 09.06.2010 Bulletin 2010/23 (21) Application number: 08828480.7 (22) Date of filing: 29.08.2008

(51) International Patent Classification (IPC):  C21B 11/00(2006.01) (86) International application number: PCT/KR2008/005097 (87) International publication number: WO 2009/028909 (05.03.2009 Gazette 2009/10)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 29.08.2007 KR 20070087315 24.12.2007 KR 20070136401 (71) Applicant: POSCO Nam-ku, Pohang-shi Kyungsangbuk-do 790-300 (KR)	(72) Inventors: CHO, Il-Hyun Pohang-shi Kyungsangbuk-do 790-360 (KR) KIM, Do-Seueng Pohang-shi Kyungsangbuk-do 790-360 (KR) BAE, Jin-Chan Pohang-shi Kyungsangbuk-do 790-360 (KR) (74) Representative: Zech, Stefan Markus et al Meissner, Bolte & Partner GbR Postfach 86 06 24 81633 München 81633 München (DE)