Method of manufacturing a seamless steel pipe

B - Operations – Transporting – 21 – B

Patent

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B21B 17/02 (2006.01)

Patent

CA 2598297

This invention provides a process for producing a seamless steel pipe that can produce a seamless steel pipe while effectively suppressing a failure of a mandrel bar to be withdrawn after stretch-rolling of a rolling material formed of a high alloy steel containing not less than 5% of Cr. In the production process, a seamless steel pipe comprising a high alloy steel containing not less than 5% of Cr is produced by stretch-rolling a rolling material (3) using a retained mandrel mill (1) for maintaining the speed of a mandrel bar (2) in an axial direction at a constant value while regulating the movement speed of the mandrel bar (2) by the retained mandrel mill (1) so as to satisfy a requirement represented by formula 0.15 <= Vb/{(Vi + Ve)/2} <= 0.70 wherein Vb represents the movement speed of the mandrel bar (2); Vi represents the speed of the rolling material (3) on the inlet side of the retained mandrel mill (1); and Ve represents the speed of the rolling material (3) on the outlet side of the retained mandrel mill (1).

L'invention décrite ci-après a trait à un procédé de fabrication permettant de fabriquer des tuyaux en acier sans soudure tout en évitant qu'une barre porte-mandrin ne soit retirée après le tensionnage d'un matériel de laminage formé d'un acier fortement allié contenant au minimum 5 % de Cr. Au cours du processus de fabrication, un tuyau d'acier sans soudure comprenant un acier fortement allié contenant au moins 5 % de Cr est produit par tensionnage d'un matériel de laminage (3) utilisant un laminoir continu retenu (1) permettant de maintenir la vitesse de la barre porte-mandrin (2) sur un axe à une valeur constante en régulant la vitesse du mouvement de la barre (2) par l'intermédiaire du laminoir continu retenu (1) afin de respecter l'exigence représentée par la formule 0,15 Vb/{(Vi + Ve)/2} 0,70 où Vb symbolise la vitesse du mouvement de la barre (2), Vi, la vitesse du matériel de laminage (3) du côté de l'aspiration du laminoir continu (1), et Ve, la vitesse du matériel de laminage (3) du côté du refoulement du laminoir continu (1).

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