A study to quantify the Bauschinger effect during fabrication of micro-alloyed pipeline steel (X52 and X70) was conducted. A finite element stress model, that incorporates a kinematic yield surface formulation, was developed to calculate the magnitude of the Bauschinger effect viz a viz the relative yield surface shift ratio α/αsat. The evolution of this ratio during ERW fabrication and its relation to post forming yield behaviour is discussed. Finally the relationship between α/αsat and pipe properties will be discussed.

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