DOI: 10.52150/2522-9117-2025-39-12
E. V. Oliinyk1, ORCID 0000-0002-3366-3746
E. V. Parusov1, D. Sc. (Tech.), Senior Researcher, ORCID 0000-0002-4560-2043
I. M. Chuiko1,*, Ph. D. (Tech.), Senior Researcher, ORCID 0000-0002-4753-614X
O. V. Parusov1, Ph. D. (Tech.), Senior Researcher, ORCID 0000-0002-9879-6179
T. M. Golubenko1, Ph. D. (Tech.), ORCID 0000-0002-3583-211X
1Iron and Steel Institute of Z. I. Nekrasov NAS of Ukraine
*Corresponding author: ferrosplav@ukr.net
STUDY OF STRUCTURE FORMATION PATTERNS IN CrMoV1Si STEEL WIRE ROD DURING SIMULATION OF INDUSTRIAL AIR COOLING MODES
Abstract. The patterns and features of structure formation in low-carbon alloyed CrMoV1Si steel intended for welding applications were studied through laboratory simulation of industrial continuous controlled air cooling modes. In determining the temperature-time parameters of the thermal cycles, it was necessary to apply quasi-isothermal holding of the wire rod within the range of diffusion transformation of undercooled austenite, taking into account the technological specifics of operating Stelmor-type cooling lines in the production flow of rolling mills at three manufacturing plants. The fundamental distinction of the simulated modes lies in the varying cooling rates within the temperature range of the diffusion γ → α transformation, determined by the actual length of the air cooling sections on Stelmor lines, which are equipped with heat-insulating hoods, and by the minimum permissible conveyor speed for metal transport. A new scientifically grounded temperature-rate schedule of differentiated continuous air cooling for the studied steel was proposed, aimed at minimizing the amount of hard phases (martensite and bainite) formed in the metal structure: starting air cooling temperature – 950 °C; accelerated cooling within 950-850 °C at a rate of ~10 °C/s; slow cooling within 850-570 °C at a rate of ~0.4 °C/s; cooling from 570 °C to room temperature in still air. As a result, the structure of the studied steel comprises 60 vol.% polyhedral ferrite, 29 vol.% pearlite, 8 vol.% bainite, and 3 vol.% martensite in the form of relatively uniformly distributed individual grains with high hardness. Faster or slower cooling of the steel within the γ → α transformation range, compared to the developed mode, leads to an increase in the amount of quenching structures formed. The identified structural formation characteristics in CrMoV1Si steel provide the basis for the development and practical implementation of a softening thermomechanical treatment technology for wire rod made from low-carbon Cr-Mo-V welding steels under industrial conditions in metallurgical plants.
Key words: wire rod, microstructure, martensite, cooling rate, simulation.
For citation: Oliinyk, E. V., Parusov, E. V., Chuiko, I. M., Parusov, O. V., & Golubenko, T. M. (2025). Study of structure formation patterns in CrMoV1Si steel wire rod during simulation of industrial air cooling modes. Fundamental and Applied Problems of Ferrous Metallurgy, 39, 210-225. https://doi.org/10.52150/2522-9117-2025-39-12
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Received 03.08.2025
Accepted 21.10.2025
Published online 01.12.2025
