The composition of a high-strength microalloyed steel of strength category X80 for large diameter pipes was analyzed. Semi-industrial melts differed either in composition or in percentage contents of introduced carbonitride forming elements (vanadium, niobium). The metal was teemed, forged, rolled, control cooled and heat treated. The level of strength properties in accordance with the strength category X80 requirements was obtained. However, the level of impact strength on V-notch samples at the test temperature of -20 deg C was not achieved. Tempering of hot-rolled plates at 620 deg C resulted in a decrease in strength properties within the norms of technical documents and higher indicators of impact strength. Hardening and tempering at 620 deg C of Mo-steel microalloyed with vanadium and niobium allowed achievement of the level of strength properties corresponding to category X100 with sufficiently high plasticity and impact strength.


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    Title :

    Development of vanadium-containing high strength sheet steel and technology of its production for large diameter pipelines


    Additional title:

    Entwicklung eines vanadiumhaligen hochfesten Blechstahls und der Herstellungstechnologie von Pipelines mit großem Durchmesser


    Contributors:


    Publication date :

    2007


    Size :

    6 Seiten, 6 Bilder



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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