Method and apparatus for producing steel pipes having...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 8/10 (2006.01) C21D 9/08 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01)

Patent

CA 2748046

The invention relates to a method and to an apparatus for producing pipes made of steel. According to the inventi-on, within a period of time of no more than 20 seconds after the last deformation at a temperature greater than 700°C, bit less than 1050°C, during passage a cooling medium is applied with elevated pressure onto the outside circumference of the pipe over a length of greater than 400 times the pipe wall thickness in a quantity which during rapid cooling provides an equivalent cooling speed of greater than 1°C/second of the pipe wall over the pipe length to a temperature in the range of 500°C to 250°C, whereupon further cooling of the pipe down to room temperature is carried out by exposure to air.

L'invention concerne un procédé et un dispositif pour fabriquer des tubes en acier. Selon l'invention, il est prévu que dans un laps de temps d'au maximum 20 s. après la dernière déformation à une température supérieure à 700 °C, toutefois inférieure à 1050 °C, un fluide de refroidissement soit appliqué avec une pression accrue en continu sur la surface extérieure du tube, circonférentiellement, en une longueur supérieure à 400 fois l'épaisseur de paroi du tube, en une quantité qui donne, lors du refroidissement rapide, une même vitesse de refroidissement de plus de 1 °C/s. de la paroi du tube sur la longueur du tube pour arriver à une température de l'ordre de 500 °C à 250 °C, à la suite de quoi un refroidissement ultérieur du tube a lieu à l'air à température ambiante.

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