(19)

(11)

EP 2 024 575 A1

(12)

(43) Date of publication: 18.02.2009 Bulletin 2009/08 (21) Application number: 07730668.6 (22) Date of filing: 02.04.2007

(51) International Patent Classification (IPC):  E02D 27/12(2006.01) (86) International application number: PCT/FI2007/050181 (87) International publication number: WO 2007/141376 (13.12.2007 Gazette 2007/50)

(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 MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 02.06.2006 FI 20065375 (71) Applicant: Rautaruukki OYJ 00810 Helsinki (FI)	(72) Inventor: MOISIO, Marko FI-05460 Hyvinkää (FI) (74) Representative: Valkeiskangas, Tapio Lassi Paavali  Kolster Oy Ab Iso Roobertinkatu 23 P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)