Method of manufacturing seamless tube

Details Method of manufacturing seamless tube Method of manufacturing seamless tube

B - Operations, Transporting

21

B

B21B 17/02 (2006.01) B21B 23/00 (2006.01)

Patent

CA 2519815

When manufacturing a seamless pipe by carrying out elongation rolling and sizing on a mother tube for forming a seamless pipe, the occurrence of portions of thickness variation in the seamless pipe is suppressed by previously identifying the portions of wall thickness variation where the thickness varies in the circumferential direction of the seamless pipe, and carrying out elongation rolling so that the thickness of the portions of the mother tube corresponding to the portions of wall thickness variation of the seamless pipe are different in thickness at the completion of elongation rolling from that of other portions of the mother tube. As a result, local variations in wall thickness in the circumferential direction of a seamless pipe are prevented.

L'invention concerne un procédé de fabrication d'un tube sans soudure par étirage/laminage et laminage selon un diamètre fixe d'un tube brut sans soudure. Ce procédé comprend les étapes consistant à obtenir, au préalable, la partie de variation de l'épaisseur de paroi du tube sans soudure dans laquelle l'épaisseur de ce tube sans soudure varie en direction circonférentielle, et à étirer/laminer ce tube sans soudure de façon que l'épaisseur du tube sans soudure brut étiré/laminé au niveau de la partie correspondant à la partie de variation de l'épaisseur de paroi soit différente de l'épaisseur du tube sans soudure dans des parties générales autres que cette partie, pour supprimer l'apparition d'une partie de variation d'épaisseur de paroi dans ce tube sans soudure. Ainsi, on évite que l'épaisseur de paroi du tube sans soudure ne varie partiellement dans la direction circonférentielle.

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