Extensive studies to develop high strength linepipes with higher deformability have been conducted. One of the key technologies for improving deformability is dual-phase microstructural control. Steel plate with ferrite-bainite microstructure can be obtained by applying thermo-mechanical controlled processing, TMCP, combined with controlled rolling and accelerated cooling process. Low-carbon boron-free steels were used to enable the ferrite formation during cooling after controlled rolling, and the accelerated cooling process with ultimate cooling rate enabled achieving high strength of up to X120 grade. Heat Treatment On-line Process, 'HOF', was also applied subsequently after accelerated cooling in order to improve Charpy energy of the base material. Trial production of X120 high deformability linepipe was conducted by applying dual-phase microstructural control.


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    Title :

    Development of ultra-high strength linepipes with dual-phase microstructure for high strain application


    Additional title:

    Entwicklung von ultrahochfesten Großrohren mit Dualphasengefüge für hohe Dehnungsbeanspruchungen
    Titel japanisch


    Contributors:

    Published in:

    JFE Giho ; 17 ; 26-30


    Publication date :

    2007


    Size :

    5 Seiten, 12 Bilder, 3 Tabellen, 7 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    Japanese




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