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

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.

1. Shinkin V. N. Mechanics of continuous media for metallurgists. Moscow : MISiS, 2014. 628 p.
2. Shinkin V. N. Moment at elastic-plastic bending of steel sheet. Part 2. Cubic approximation of steel’s hardening zone. Chernye Metally. 2022. No. 2. pp. 15−18.
3. Shinkin V. N. The curvature of steel bimetallic beam after its axial elastoplastic stretching. Chernye Metally. 2023. No. 4. pp. 60−64.
4. Zhigulev G. P., Skripalenko M. M., Fadeev V. A., Skripalenko M. N., Danilin V. N. Modelling of the sheet forming while 3-roller bending process. CIS Iron and Steel Review. 2022. Vol. 23. pp. 45−49.
5. Zhigulev G. P., Skripalenko M. N., Fadeev V. A., Skripalenko M. M. Modeling of deformation zone during plate stock molding in three-roll plate bending machine. Metallurgist. 2020. Vol. 64. No. 3-4. pp. 348−355.
6. Chu Y., Hao B., Li Z., Zhu J., He X. An analytical model for predicting residual stresses in multiple layers by plasma cladding process. AIP Advances. 2019. Vol. 9. 085103.
7. Dean J., Gu T., Clyne T. W. Evaluation of residual stress levels in plasma electrolytic oxidation coatings using a curvature method. Surface and Coating Technology. 2015. Vol. 269. No. 5. pp. 47−53.
8. Belskiy S. M., Shopin I. I. Local thickenings and thinnings of hot rolled strips. Materials Science Forum. 2022. Vol. 1052. pp. 340−345.
9. Belskiy S. M., Shopin I. I., Safronov A. A. Improving efficiency of rolling production by predicting negative technological events. Defect and Diffusion Forum. 2021. Vol. 410. pp. 96−101.
10. Gribkov E. P., Kovalenko A. K., Hurkovskaya S. S. Research and simulation of the sheet leveling machine manufacturing capabilities. The International Journal of Advanced Manufacturing Technology. 2022. Vol. 120. No. 1-2. pp. 743−759.
11. Andrianov I. K., Feoktistov S. I. Bearing capacity of spherical thick-walled shell taking into account compressibility and nonlinear plasticity. Materials Physics and Mechanics. 2022. Vol. 50. No. 3. pp. 410−419.
12. Yan C., Zhang H., Zhu Z., Zhang K., Gu Z., Wang B. Analysis of welding residual stress in multipass hybrid laser-mig welded X80 pipeline steel. Transactions of the China Welding Institution. 2021. Vol. 42. No. 9. pp. 28−34.
13. Zubchenko A. S. Guide of steels and alloys grades. Moscow: Mashinostroenie, 2003. 784 p.