This paper describes the metallurgical science used to develop a new, weldable, high-strength linepipe (X120) for the transport of natural gas. A domain-based microstructure design has been used to ensure ductile fracture behavior at temperatures down in - 20 degree C. Ultra refinement involving careful chemistry design and thermomechanical controlled processing (TMCP) produced fine domains below about 2 my m within prior austenite pancakes below about 6 my m in thickness. To achieve the target properties in the pipe body, seam weld and girth weld heat-affected zones (HAZ), 3 low-carbon microstructure designs have been produced. Low-carbon chemistry and Nb/V micro-alloying combined with boron additions were used to impart sufficient HAZ cold cracking resistance and to limit softening in the seam weld HAZ. Both the lower bainite and the dual-phase microstructures provided superior property combinations.


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    Titel :

    Metallurgical design of ultra high-strength steels for gas pipelines


    Weitere Titelangaben:

    Metallurgie von ultrahochfesten Stählen für Erdgasfernleitungen


    Beteiligte:
    Koo, J.Y. (Autor:in) / Luton, M.J. (Autor:in) / Bangaru, N.V. (Autor:in) / Petkovic, R.A. (Autor:in) / Fairchild, D.P. (Autor:in) / Petersen, C.W. (Autor:in) / Asahi, H. (Autor:in) / Hara, T. (Autor:in) / Terada, Y. (Autor:in) / Sugiyama, M. (Autor:in)


    Erscheinungsdatum :

    2004


    Format / Umfang :

    9 Seiten, 27 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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