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Metal Forming
ArticleName Residual curvature of bimetallic sheet at elastoplastic bending
DOI 10.17580/chm.2023.07.08
ArticleAuthor V. N. Shinkin

National University of Science and Technology “MISIS”, Moscow, Russia:

V. N. Shinkin, Dr. Phys.-Math., Prof., Dept. of Physics, e-mail:


The durability of the large-diameter thick-walled steel pipes on the main gas and oil pipelines depends on the quality and strength of the isolation of the outer and inner surfaces of the pipes. Such pipes have an external strong anticorrosive three-layer polyethylene or polypropylene coating. To insulate the inner surface of large diameter pipes, the pipe’s inner surface is heated and the thin layer of a smooth (antifriction) coating or an internal anticorrosion epoxy coating is applied, which may with time break down, when pumping gas and oil containing acidic aggressive components. Therefore, Gazprom PJSC recommended that Russian metallurgical plants establish the production of the thick-walled bimetallic (clad) large-diameter steel pipes with an internal coating from anticorrosive steel with a thickness of about 2 mm. The service life of such pipes is about 40 years. The mechanical deformation of bimetallic sheet is qualitatively different from the deformation of a monometallic sheet. Below, the mathematical model for calculating the curvature of the bimetal sheet after its elastoplastic bending without and with taking into account thermal heating is obtained.

keywords Materials science, metals and alloys, steel bimetallic sheet, elastoplastic bending, residual curvature of sheet

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