FIELD: metallurgy; technological processes.
SUBSTANCE: invention relates to metal forming and can be used for production of flexible steel pipe. Cylindrical shape is imparted to a flexible three-point sheet on width. Edges of non-expanded pipe are connected means of a welded seam. Expander pipe with segments for expansion of said pipe is introduced. Expander segments are pressed to all regions, without deformation as a result of three-point bending. Number of three-point bends is set depending on number of expander segments.
EFFECT: providing a regular round pipe shape of pipe.
1 cl, 2 tbl, 7 dwg
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