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EP0029786A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Process and device for producing a steel tube without welding joint by hot-rolling on a mandrel

Assignee: Vallourec SA
•
Filing: 1980-11-21
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Granted: —
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Expires: 2000-11-21
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Abstract

Abstract Translated from French On commence une réduction étirage du tube dans l'axe du laminoir continu (1) dans la zone du tube où il n'y a plus de mandrin, avant la fin du laminage continu, par passage de cette zone entre des cylindres de réduction (4) situés en aval et en ligne avec le laminoir continu (1) ; on achève la réduction du tube avant de lâcher le mandrin et avant que ce dernier se présente devant la première cage (4). On commande l'ouverture de ces cages (4) avant de faire passer le mandrin à travers les cages de réduction (4) pour éviter tout contact du mandrin avec les surfaces de travail des cylindres de réduction. Application particulière aux tubes minces de la gamme 100 × 4mm à 250 × 7mm (diamètre extérieur × épaisseur). A reduction in stretching of the tube in the axis of the continuous rolling mill (1) is started in the zone of the tube where there is no longer a mandrel, before the end of the continuous rolling, by passage of this zone between reduction cylinders ( 4) located downstream and in line with the continuous rolling mill (1); the reduction of the tube is completed before releasing the mandrel and before the latter presents itself in front of the first cage (4). The opening of these cages (4) is controlled before passing the mandrel through the reduction cages (4) to avoid any contact of the mandrel with the working surfaces of the reduction cylinders. Particular application to thin tubes in the range 100 × 4mm to 250 × 7mm (outside diameter × thickness).

Inventors

  • 👤 Jacques Verdickt

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 20:07
CPC Classifications
B; B21; B21B; B21B17/00; B21B17/02; B21B17/04; B21B17/14; B21C; B21C45/00

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

BE348267A Cited
FR419568A Cited
US2356734A Cited
FR1205075A Cited
FR2198797A1 Cited
FR2383717A1 Cited
DE2732342A1 Cited
FR2419776A1 Cited

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