Method of forming electric welded steel tube

Details Method of forming electric welded steel tube Method of forming electric welded steel tube

B - Operations, Transporting

21

C

327/40, 78/48

B21C 37/08 (2006.01) B23K 5/02 (2006.01)

Patent

CA 1176086

ABSTRACT OF THE DESCLOSURE: In a method of forming an electric welded steel tube, wherein a hot-rolled sheet is formed into a cylindrical shape, with the central portion thereof being lowered as the forming progresses, and thereafter, subjected to reduction in the circumferential direction of the tube by means of tandem type fin-pass rolls to be finished into the tube, the proper forming condition ranges capable of eliminating occurrence of edge waves in the tube seam edge portion and / or of cambers in the longitudinal direction of the tube by three forming conditions factors including the downhill value DH (downhill coefficient ?) of the hot-rolled sheet, the fin-pass total reduction R of the tandem type fin-pass rolls and the distribution of the fin-pass reduction (the distribution ratio .delta. of the first fin-pass reduction).

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