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(11)

EP 2 997 168 A2

(12)

(88) Date of publication A3: 22.01.2015 (43) Date of publication: 23.03.2016 Bulletin 2016/12 (21) Application number: 14734592.0 (22) Date of filing: 16.05.2014

(51) International Patent Classification (IPC):  C21D 8/02(2006.01) C23C 2/02(2006.01) C22C 38/00(2006.01) C22C 38/04(2006.01) C22C 38/18(2006.01) C22C 38/06(2006.01) C22C 38/26(2006.01) C22C 38/34(2006.01) C21D 9/46(2006.01) C23C 2/06(2006.01) C22C 38/02(2006.01) C22C 38/12(2006.01) C21D 1/18(2006.01) C22C 38/22(2006.01) C22C 38/32(2006.01) (86) International application number: PCT/US2014/038364 (87) International publication number: WO 2014/186689 (20.11.2014 Gazette 2014/47)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 17.05.2013 US 201361824699 P 17.05.2013 US 201361824643 P (71) Applicant: Ak Steel Properties, Inc. West Chester, OH 45069 (US)	(72) Inventors: THOMAS, Grant, Aaron Liberty Township, OH 45011 (US) LOSZ, Jose Mauro, B. Middletown, OH 45042 (US) (74) Representative: Samson & Partner Patentanwälte mbB  Widenmayerstraße 6 80538 München 80538 München (DE)