The recent trends in the design criteria, laying technologies and service conditions for offshore pipelines call for high performance seamless pipes tailored to the specific applications required by the market. Experiences that have been successfully performed by DST Group in the large-scale production of seamless pipes for special offshore applications are presented in this paper. A 0.1C-1Mn steel, with optimized Nb and V contents, was developed for quenched and tempered (Q&T) seamless pipes (O.D. 219.1 mm, W.T 15.4 mm), which showed excellent mechanical and corrosion performances after full-scale-simulated reeling. For heavy wall pipes (O.D. 304.5 mm, W.T. 34 mm) a Mo-V-Ti steel was selected in order to guarantee a suitable combination of strength, yield to tensile ratio (YS/UTS) and work hardening ratio (WHR) even at high temperatures (160 degree C). Adequate strain aging and HIC resistance was also obtained in such Q&T seamless pipes, which have been successfully delivered for a high temperature , high pressure offshore production line.


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    Title :

    Sour service X65 seamless linepipe for offshore special applications


    Contributors:
    Anelli, E. (author) / Colleluori, D. (author) / Gonzalez, J.C. (author) / Cumino, G. (author) / Quintanilla, H. (author) / Tivelli, M. (author)


    Publication date :

    2001


    Size :

    8 Seiten, 10 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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