(19)

(11)

EP 2 729 593 A2

(12)

(88) Date of publication A3: 25.04.2013 (43) Date of publication: 14.05.2014 Bulletin 2014/20 (21) Application number: 12766454.8 (22) Date of filing: 06.07.2012

(51) International Patent Classification (IPC):  C23C 4/02(2006.01) C23C 4/18(2006.01) C23C 4/04(2006.01) (86) International application number: PCT/FI2012/050712 (87) International publication number: WO 2013/004913 (10.01.2013 Gazette 2013/02)

(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 (30) Priority: 06.07.2011 FI 20115719 (71) Applicant: Rautaruukki Oyj 00810 Helsinki (FI)	(72) Inventor: LANKILA, Arimo FI-00810 Helsinki (FI) (74) Representative: Kolster Oy Ab  Iso Roobertinkatu 23 PO Box 148 00121 Helsinki 00121 Helsinki (FI)