(19)

(11)

EP 3 402 906 A1

(12)

(43) Date of publication: 21.11.2018 Bulletin 2018/47 (21) Application number: 17706330.2 (22) Date of filing: 17.01.2017

(51) International Patent Classification (IPC):  C21D 8/02(2006.01) C21D 9/46(2006.01) C21D 8/04(2006.01) C21D 9/48(2006.01) (86) International application number: PCT/US2017/013717 (87) International publication number: WO 2017/124081 (20.07.2017 Gazette 2017/29)

(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 Designated Validation States: MA MD (30) Priority: 14.01.2016 US 201662278567 P 12.10.2016 US 201662407001 P (71) Applicant: Ak Steel Properties, Inc. West Chester, OH 45069 (US)	(72) Inventor: GILL, Amrinder, Sigh West Chester OH 45241 (US) (74) Representative: Samson & Partner Patentanwälte mbB  Widenmayerstraße 6 80538 München 80538 München (DE)