National University of Science and Technology “MISiS” (Moscow, Russia):

Kolikov A. P., Dr. Eng., Prof., Chair of Metal Forming, e-mail: apkolikov@mail.ru

All-Russian Scientific and Research Institute of Tube Industry - RosNITI (Chelyabinsk, Russia):
Zvonarev D. Yu., Cand. Eng., Head of Laboratory

Staryi Oskol Technological Institute named after A. A. Ugarov — affiliate of National University of Science and Technology “MISiS” (Staryi Oskol, Russia):
Taupek I. M., Post-Graduate
Sidorova T. Yu., Senior Lecturer, Chair of Metal Forming

The methods of mathematical simulation using finite elements technique are presented for description of strip plastic deformation in manufacture of large-diameter tubes. The parameters of metal stressstrain state along the whole technological line are evaluated for strip forming at extrusion equipment (beading machine, step forming) and for expanding of fi nished tubes. It is shown that the parts of tube billet with large heterogeneity of stress-strain state are characterized by increased values of residual stresses and strains; thereby increase of tube diameter and out-of-roundness in comparison with their average values are noted. The developed computer program allows to determine the ultimate values of out-of-roundness of formed O-shaped tube billet and finished tube after its sizing in expander. This program also enables to define the values of controlled geometric parameters of finished tubes in correspondence with standard requirements.

1. Efron L. I. Metal science in “big” metallurgy. Pipe steels. Moscow : Metallurgizdat, 2012. 696 p.
2. Osadchiy V. Ya., Kolikov A. P. Production and quality of steel pipes. Moscow : MGUPI, 2012. 370 p.
3. Deriks V., Genzer B. New technologies of economic and flexible manufacturing of large-diameter pipes. Proceedings of the XIII International scientific and practical conference “Pipes-2005”. Part 1. Chelyabinsk : JSC «RosNITI», 2005. pp. 105–108.
4. Shinkin V. N., Kolikov A. P. Simulation of the shaping of blanks for largediameter pipe. Steel in Translation. 2011. Vol. 41, No. 1. pp. 61–66.
5. Shinkin V. N., Kolikov A. P. Engineering calculations for processes involved in the production of large-diameter pipes by the SMS Meer technology. Metallurgist. 2012. Vol. 55, No. 11–12. pp. 833–840.
6. Mazur I. I., Ivantsov O. M. Safety of pipeline systems. Moscow : ITs «ELIMA», 2004. 1104 p.
7. Zvonarev D. Yu. Improvement of the processes of edge forming and step molding of large-diameter welded pipes for high accuracy of sizes and shapes : Candidate’s Dissertation. Chelyabinsk : FGBOU VPO «YuUrGU» (NIU), 2015.
8. Shinkin V. N. Continuum mechanics for metallurgists. Moscow : MISiS, 2014. 628 p.
9. Galkin V. V., Cheburkov A. C., Pachurin G. V. Evaluation of stressstrain of metallla billets made turn-based molding method of mathematical modeling. Sovremennye problemy nauki i obrazovaniya. 2013. No. 2. pp. 114–115.
10. Seleznev V. E., Aleshin V. V., Pryalov S. N. Basis of numerical modeling of transmission pipelines. Ed.: V. E. Seleznev. Second edition, revised and enlarged. Moscow : MAKS-Press, 2009. 436 p.
11. Wen S. W., Hilton P., Farrugia D. C. J. Finite element modeling of a submerged arc welding process. Journal of Materials Processing Technology. 2001. Vol. 119. pp. 203–209.
12. Kishiguchi T., Hosoda H., Ikuno Y. Pipe end round equipment and control system (PERFECTS). Chin-Niittetsu-Sumikin Engineering Gino. 2013. No. 4. pp. 39–45.
13. Katsumi M., Kenji O. Steel Products for Energy Industries. JFE Technical Report. 2013. Vol. 43, No. 18 (March). pp. 1–11.
14. Kolikov A. P., Romantsev B. A. Metal forming theory. Moscow : MISiS, 2015. 451 p.
15. Matveev Yu. M., Kashirin N. A. Distribution of residual voltages in billets for large-size pipes manufacturing: collection of papers of VINITI. Issue 5. Moscow : Metallurgiya, 1965. pp. 6–10.