Abstract
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Highlights
Development of high strength steels for the new generation of gas pipelines designed for a high operation pressure is subject of many studies in pipeline and pipe making industries [1,2,3]
It is evident that the specimens have as a different deformation behavior as on a yield point as during uniform stage
Digital Image Correlation (DIC) strain fields of εyy-component are testified that the Luders deformation is realized by 1 band in specimen I, 6 cross bands in specimen II and 2 cross bands in specimen III (Fig. 2)
Summary
Development of high strength steels for the new generation of gas pipelines designed for a high operation pressure is subject of many studies in pipeline and pipe making industries [1,2,3]. Secondary refining and continuous casting followed by thermo-mechanical controlled processing (TMCP) with strict temperature-reduction route and post-deformation cooling rate control are used to produce X80 and a higher grade pipes with ultrafine ferrite-bainite (fully bainite) structure. Discontinuous yielding has been frequently observed in such materials [6,7,8]. It was occurs during the pipe making process after cold forming followed by anti-corrosion coating at 200-250∘C.
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