(19)

(11)

EP 0 231 337 A1

(12)

(43) Date of publication: 12.08.1987 Bulletin 1987/33 (21) Application number: 86904973.0 (22) Date of filing: 01.08.1986

(51) International Patent Classification (IPC):  B21B 45/ 02( . ) (86) International application number: PCT/SE1986/000349 (87) International publication number: WO 1987/000772 (12.02.1987 Gazette 1987/04)

(84) Designated Contracting States: AT BE DE FR GB IT NL (30) Priority: 08.08.1985 SE 19850003740 (71) Applicant: MEFOS-STIFTELSEN FÖR METALLURGISK FORSKNING S-951 28 Lulea (SE)	(72) Inventor: TJERNQUIST, Ulf S-951 45 Lulea o (SE)