Gas–liquid intermittent flow is a kind of pattern that distinguishes itself from the conventional by apparent non-steady feature, which causes serious corrosion issues, including localized corrosion. Although it widely exists in wet gas pipelines, how gas–liquid influences CO2 pipeline steels remains problem to be clarified. In this work, testing device enables good simulation pipelines under v...

Friction stir welding (FSW) is an excellent alternative process used in pipelines circumferential welds due to fusion welded joint low corrosion resistance. This study describes the resistance as a function of microstructural features resulting from API X70 FSW joint. The were examined by optical microscopy, scanning electron and x-ray diffraction. analysis was conducted employing potentiodynam...

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This study aims to examine the correlation between microstructures and mechanical properties of two high-strength API X70 linepipe steels with different specimen directions Moaddition. The microstructure Mo-added steel has an irregularly shaped AF, GB matrix pearlite because relatively large deformation in non-recrystallization temperature region, while that Mo-free shows a PF bainitic microstr...