Welded structure having improved resistance to stress...

Details Welded structure having improved resistance to stress... Welded structure having improved resistance to stress...

B - Operations, Transporting

23

K

B23K 35/22 (2006.01) B23K 9/23 (2006.01) F16L 13/02 (2006.01) F16L 58/00 (2006.01)

Patent

CA 2536051

This invention relates to a welded line pipe structure for transporting corrosive petroleum or natural gas. It is constituted by martensitic stainless steel pipes containing 8 - 16% Cr and at most 0.05% C. By suitably controlling the welding conditions at the time of girth welding of the steel pipes so as to ensure that the Cr concentration in grain boundary Cr-depleted portions existing immediately beneath a weld oxide scale is at least 5%, the occurrence of SCC in a high temperature CO2 environment can be prevented.

L'invention concerne une structure de tuyau linéaire soudée utilisée dans le transport de pétrole et de gaz naturel corrosif, et formée d'acier inoxydable martensitique contenant de 8 à 16 % de Cr et de 0,05 % ou moins de C. Une partie ayant un contenu réduit de Cr à joint de grain, située directement en dessous d'une échelle d'oxydation de soudage, présente une concentration de Cr de 5 % ou plus. La concentration de Cr de la partie ayant un contenu réduit de Cr peut être obtenue par application de conditions appropriées dans le soudage circonférentiel de tuyaux d'acier pour fabriquer la structure. La structure de tuyau linéaire soudée permet de prévenir l'occurrence de SCC en présence de CO2 à haute température.

Affiliated with

Also associated with

Rating

Welded structure having improved resistance to stress... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Welded structure having improved resistance to stress..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Welded structure having improved resistance to stress... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1940732