Method for producing a large steel tube

Details Method for producing a large steel tube Method for producing a large steel tube

B - Operations, Transporting

21

C

B21C 37/08 (2006.01) B21D 3/10 (2006.01) B21D 5/10 (2006.01)

Patent

CA 2726132

The invention relates to a method for pro-ducing a steel tube, wherein a steel sheet (4) is formed into tubular body (1.2) having a round cross section in a ben-ding process (a), welded in a subsequent welding process (b) along the longitudinal edges facing each other for pro-ducing a continuous longitudinal seam, and then subjected to a stress-relieving treatment. The production quality is improved, with reduced production time, in that the stress-- relieving treatment is performed in a process (c) for con-centrically truing along the circumference in at least one segment relative to the longitudinal axis thereof, while cold forming by compression (Fig. 1). The mechanical technological properties of the material are also thereby improved.

L'invention concerne un procédé de fabrication d'un tuyau en acier, selon lequel une plaque de tôle (4), lors d'une opération de cintrage (a), est façonnée en un corps tubulaire (1.2) de section transversale ronde, puis, lors d'une opération de soudage (b) soudée le long de ses bords longitudinaux se faisant face pour former un cordon de soudure continu sur la longueur, avant une opération de relaxation des contraintes. La qualité de fabrication pour un temps de fabrication réduit est favorisée par le fait que la relaxation des contraintes est réalisée lors d'une opération (c) de dressage circulaire sur la circonférence, sur au moins une partie de la pièce relativement à son axe longitudinal, par formage à froid et refoulement. Les propriétés mécaniques du matériau sont ainsi améliorées.

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