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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    Title :

    Metallurgical design of ultra high-strength steels for gas pipelines


    Additional title:

    Metallurgie von ultrahochfesten Stählen für Erdgasfernleitungen


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


    Publication date :

    2004


    Size :

    9 Seiten, 27 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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