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Production of pipes
ArticleName Bending of bimetallic steel sheet on three-roll mills in the production of large diameter tubes
DOI 10.17580/chm.2024.06.09
ArticleAuthor V. N. Shinkin
ArticleAuthorData

National University of Science and Technology "MISIS", Moscow, Russia

V. N. Shinkin, Dr. Phys.-Math., Prof., Dept. of Physics, e-mail: shinkin-korolev@yandex.ru

Abstract

The three-roll bending mills are used for the production of the cylindrical, oval and conical products by bending sheet metal. The operation principle of the three-roll bending mills is based on the oppositely directed rotation of the rolls, due to which the sheet material is captured and bent along a given radius. During the forming process, the rolls perform a reversible movement, while the upper roll rise and go down to adjust the diameter of the billet being formed. The durability of the large-diameter thick-walled steel tubes on the main gas-and-oil pipelines significantly depends on the quality and strength of the insulation of the outer and inner tubes’ surfaces. Such tubes have a durable external anticorrosive three-layer polyethylene or polypropylene coating. To insulate the inner surface of the large-diameter tubes, for example, it is possible (prospectively) to apply a thin layer of anti-corrosion steel to the inner surface of the tube, which is not destroyed when pumping gas and oil, containing acidic aggressive components. The service life of such thick-walled bimetallic (clad) large-diameter steel tubes with an internal coating of anti-corrosion steel with a thickness of about 2–3 mm is about 40 years. Such tubes are produced, for example, on the Haeusler three-roll mills from a bimetallic sheet, the basis of which is highstrength tubular steel (substrate) with a thickness of 17–32 mm of strength class K55–K65, coated with a layer of anti-corrosion steel with a thickness of about 2–3 mm. Rolling of a bimetallic sheet on the three-roll mills is qualitatively different from rolling of a monometallic sheet on the threeroll mills. A mathematical model for calculating the residual curvature of a bimetallic sheet after its elastic-plastic bending on the three-roll mills is constructed below.

keywords Bimetallic steel sheet, elastic-plastic bending, residual curvature of sheet, three-roll sheet-bending mills, large-diameter tubes
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