Abstract
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Highlights
By means of optical microscopy it was found that the structure of the steel consisted of ferrite grains and bainite/martensite (Fig.1)
The controlled-rolled specimens exhibit a continuous yielding behavior during tensile test, which is mainly attributed to the mobile dislocations formed in the matrix during thermo-mechanical controlled processing (TMCP)
The tensile strength after low-temperature heating increases by 15... 19 MPa in samples cut both in the direction parallel and perpendicular to the rolling axis
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. Steady increase of technical requirements to a wide complex of mechanical properties determining reliability of a pipeline has resulted in essential achievements in V, Nb, Ti-microalloyed low and extra-low carbon pipeline steels. How to cite this article: P.O. Selivanov, V.A. Khotinov, and O.V. Selivanova, (2019), “The Structure and Mechanical Properties of Low Carbon Steel after Controlled Rolling and Low-Temperature Treatment” in XIX International scientific-technical conference “The Ural school-seminar of metal Page 275 scientists-young researchers”, KnE Engineering, pages 275–280. During the pipe making process, cold forming (with a strain of about 1%), followed by anti-corrosion coating at around 250∘С, is essentially a static strain aging process, which will generally increase strength and decrease ductility. Strain aging of the pipe incurred during coating heating could increase the yield strength of the pipe to some degree. This, in turn, increases the yield ratio (Y/T) and possibly worsens the deformability of the pipes [6]
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