FIELD: manufacturing of seamless metal pipes. SUBSTANCE: workpiece is pierced in two-roll pass on a profiled mandrel with constant horizontal and increasing vertical cross-section axes. Mandrel interacts with working surfaces of rolls pass behind their axis plane leveling thickness of sleeve wall over perimeter. Even walled sleeve is widened by a part of mandrel outside the pass until it becomes round of required pipe dimensions. Liquid is supplied under high pressure through the front side of mandrel. EFFECT: enhanced quality. 8 dwg
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