To provide a lower-cost option for long-distance gas transmission, X120 UOE linepipe has been developed. An interrupted direct quench (IDQ) process and boron additions were employed on a low-alloy steel to obtain a lower bainite microstructure with extremely small austenite grains. Plates of up to 20-mm thickness are possible with at least 231 J of Charpy energy at - 30 degree C. For longitudinal seam welding, a new wire and a new flux were developed. Heat-affected zone (HAZ) softening is limited by using a low heat input welding procedure. HAZ cold cracking resistance is excellent due to the low carbon content and Pcm relative to the X120 strength level.


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    Title :

    Development of plate and seam welding technology for X120 linepipe


    Contributors:
    Asahi, H. (author) / Hara, T. (author) / Sugiyama, M. (author) / Maruyama, N. (author) / Terada, Y. (author) / Tamehiro, H. (author) / Koyama, K. (author) / Ohkita, S. (author) / Morimoto, H. (author) / Tomioka, K. (author)


    Publication date :

    2004


    Size :

    7 Seiten, 7 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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