Steel pipe excellent in formability and method of producing...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/60 (2006.01) C21D 8/10 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01)

Patent

CA 2381405

The present invention provides a steel pipe excellent in formability during hydraulic forming and the like and a method to produce the same, and more specifically: a steel pipe excellent in formability having an r-value of 1.4 or larger in the axial direction of the steel pipe, and the property that the average of the ratios of the X-ray intensity in the orientation component group of {110} < 110 > to {332} < 110 > on the plane at the center of the steel pipe wall thickness to the random-X-ray intensity is 3.5 or larger, and/or the ratio of the X-ray intensity in the orientation component of {110} < 110 > on the plane at the center of the steel pipe wall thickness to the random X-ray intensity is 5.0 or larger; and a method to produce a steel pipe excellent in formability characterized by heating the steel pipe having the property that the ratio of the X-ray intensity in every one of the orientation components of {001} < 110 > , {116} < 110 > , {114} < 110 > and {112} < 110 > on the plane at the center of the mother pipe wall thickness to the random X-ray intensity is 3 or smaller to a temperature in the range from 650 to 1,200°C and by applying working under a condition of a diameter reduction ratio of 30% or more and a wall thickness reduction ratio of 5 to 30%.

L'invention concerne un tuyau d'acier à haute aptitude au formage, dont la valeur r dans le sens de l'axe est égale ou supérieure à 1,4. Dans un plan de la plaque d'acier du tuyau à â épaisseur, ce dernier présente une moyenne de rapports d'intensité aléatoire des rayons X supérieure ou égale à 3,5 pour les groupes d'orientation de {110}<110> à {332}<110> et/ou un rapport d'intensité aléatoire des rayons X supérieur ou égal à 5,0 pour les groupes de {110}<110>. L'invention, qui concerne également un procédé de fabrication dudit tuyau d'acier à haute aptitude au formage, est caractérisée en ce qu'elle comporte le chauffage d'un tuyau d'acier parent comprenant, dans un plan de la plaque d'acier du tuyau parent à â épaisseur, des rapports d'intensité aléatoire des rayons X inférieurs ou égaux à 3 pour toutes les orientations de {001}<110>, {116}<110>, {114}<110> et {112}<110> et dans une plage thermique allant de 650 DEG à 1200 DEG . Selon ledit procédé, le tuyau d'acier parent est soumis à un processus de formage, durant lequel une diminution de diamètre de 30 % et plus et une réduction d'épaisseur de 5 % à 30 % peuvent se produire. Le tuyau d'acier présente une excellente aptitude au formage, notamment à l'hydroformage.

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