Journals →  CIS Iron and Steel Review →  2019 →  #2 →  Back

Materials Science
ArticleName Mechanical properties of prestressing strands and how they tend to change under thermo-mechanical treatment
DOI 10.17580/cisisr.2019.02.03
ArticleAuthor A. G. Korchunov, M. A. Polyakova, D. V. Konstantinov, M. Dabalá

Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

A. G. Korchunov, Dr. Eng., Prof., Vice-Rector for International Affairs, e-mail:
M. A. Polyakova, Dr. Eng., Prof., Dept. of Material Processing Technologies, e-mail:
D. V. Konstantinov, Cand. Eng., e-mail:


University of Padova (Padova, Italy):
M. Dabalá, Dr. Eng., Prof., Dept. of Industrial Engineering, e-mail:


This paper examines the mechanical properties of high-strength (1,770 MPa) 7-wire prestressing strands and how they tend to change under thermo-mechanical treatment involving short-term induction tempering under high tension. The change dynamics of the following properties was monitored for 12.5 mm strands: tensile strength, yield strength, full elongation at maximum tension force and modulus of elasticity in the temperature range from 360 to 400 °С, the process speed range from 50 to 65 m/min, and at the tension force of 64 kN. The authors found a quantitative increase of the mechanical properties of prestressing strands for all the studied regimes of thermo-mechanical treatment. Thermo-mechanical treatment resulted in a significant growth in yield strength — from 28 to 36%, and in full elongation at maximum tension force, which demonstrated a higher than double growth. The paper shows how the temperature and rate of thermo-mechanical processing influence the mechanical properties of prestressing strands and their change dynamics.

This research was funded by the Ministry of Science and Higher Education of the Russian Federation as part of a comprehensive project aimed at establishing a hightechnology production line with support from a higher educational institution (Contract No. 02.G25.31.0178 dated 01/12/2015; No. МК204895 dated 27/07/2015).
The authors would like to thank the foundation Fondazione Cariparo for their support of the Visiting Program TIP-STEP project.

keywords Prestressing strands, high-carbon steel, thermo-mechanical treatment, mechanical properties, experimental study

1. Madatyan S. A. The current level of requirements to prestressing strands. Beton i zhelezobeton. 2005. No. 1. pp. 8–10.
2. Egorov V. D., Voronina V. S. Production of prestressing strands in a stress-relieved state. Stal. 1983. No. 3. pp. 65–66.
3. Costello G. A. Theory of wire rope. Second edition. New York: Springer, 1997. 123 p.
4. Feyrer K. Wire ropes: tension, endurance, reliability. Berlin-Heidelberg-New York: Springer, 2007. 322 p.
5. Luciano Jacinto, Manuel Pipa, Luнs Oliveira Santos. Probabilistic models for mechanical properties of prestressing strands. Construction and Building Materials. 2012. Vol. 36. pp. 84–89.
6. Yusuf Aytaç Onur. Experimental and theoretical investigation of prestressing steel strand subjected to tensile load. International Journal of Mechanical Sciences. 2016. Vol. 118. pp. 91–100.
7. Obaydullah M., Mohd Zamin Jumaat, Alengaram U. J., Mahfuz ud Darain Kh., Nazmul Huda Md., Akter Hosen Md. Prestressing of NSM steel strands to enhance the structural performance of prestressed concrete beams. Construction and Building Materials. 2016. Vol. 129. pp. 289–301.
8. Mikhaylov K. V. The challenges faced by domestic construction science in the area of rebars and prestressed reinforced concrete structures. Beton i zhelezobeton. 2004. No. 2. pp. 3–5.
9. Chukin M. V., Gun G. S., Korchunov A. G., Polyakova M. A. Prospects of production of high-strength steel reinforced bars made of highcarbon steels. Chernye Metally. 2012. No. 12. pp. 8–16.
10. Chabbi L. Simulation of microstructure and mechanical properties in section rolling. Chernye Metally. 2017. No. 9. pp. 57-62.
11. Korchunov A. G., Gun G. S., Shiryaev O. P., Pivovarova K. G. Study of structural transformation of hot-rolled carbon billets for highstrength ropes for responsible applications via the method of thermal analysis. CIS Iron and Steel Review. 2017. Vol. 13. pp. 38–40.
12. Jin Kook Kim, Jeong-Su Kim, and Seung Hee Kwon. Mechanical Properties of a New Prestressing Strand with Ultimate Strength of 2160 MPa. KSCE Journal of Civil Engineering. 2014. Vol. 18(2). pp. 607–615.
13. Yukhvets I. A. Production of high-strength reinforcement wire. Moscow : Metallurgiya, 1973. 264 p.
14. Babich V. K., Gul I. E., Dolzhenkov I. I. Strain ageing of steel. Moscow : Metallurgiya, 1972. 320 p.
15. Caballero L., Atienza J. M., Elices M. Thermo-mechanical treatment effects on stress relaxation and hydrogen embrittlement of colddrawn eutectoid steels. Metals and Materials International. Vol. 17, No. 6. 2011. pp. 899–910.
16. Ruiz-Hervias, V. Luzin, H. Prask, T. Gnaeupel-Herold, M. Elices. Effect of thermo-mechanical treatments on residual stresses measured by neutron diff raction in cold-drawn steel rods. Materials Science and Engineering A. 435–436. 2006. pp 725–735.
17. Zeren A., Zeren M. Stress relaxation properties of prestressed steel wires. Journal of Materials Processing Technology. 2003. No. 141. pp. 86–92.
18. Korchunov A. G., Tereshchenko N. A., Efimova Yu. Yu., Dabalà M., Dolgiy D. K. The mechanical properties of cold-drawn eutectoid steel and how they change under thermo-mechanical treatment. Vestnik of Nosov Magnitogorsk State Technical University. 2014. No. 1. pp. 58–62.

Full content Mechanical properties of prestressing strands and how they tend to change under thermo-mechanical treatment