Automatic Welding, 2025, №06

2025 №06 (07)

DOI of Article 10.37434/as2025.06.08

2025 №06 (01)

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"Avtomatychne Zvaryuvannya" (Automatic Welding), #6, 2024, pp. 65-72

Thermomechanical treatment technology of wire rod made of low-carbon Cr-Mo-V steels

E.V. Parusov, I.M. Chuiko, E.V. Oliinyk, O.V. Parusov

Z.I. Nekrasov Iron and Steel Institute of the NAS of Ukraine. 1 Academician Starodubov Square, 49107, Dnipro, Ukraine. E-mail: tometal@ukr.net

The paper summarizes the results of industrial testing of the softening thermomechanical treatment technology of 5.5 mm wire rod made of low-carbon Cr-Mo-V steels for welding applications. The proposed technology was developed on the basis of an in-depth synthesis of research findings concerning the influence of temperature-deformation parameters of processing on the course of phase-structural transformations and the peculiarities of the formation of quench structures in the studied steels under various continuous cooling conditions. It has been proven that the implementation of a scientifically justified post-deformation cooling mode in the Stelmor line, which includes a stage of water cooling from the finishing hot-deformation temperature of 1050 °C to 950 °C, followed by differentiated three-stage air cooling at specified rates in different temperature intervals, contributes to reducing strength values, increasing metal ductility, and forming a satisfactory amount of surface scale. Such a response of the mechanical properties of the wire rod is the result of reducing the amount of bainite and martensite in the ferritic matrix to 5…10 vol.% each, depending on the steel grade. This is achieved through controlled formation of a specific grain structure of hot-deformed austenite and suppression of the redistribution of alloying elements between the γ- and α-phases during subsequent diffusional transformation. It has been established that lowering the content of carbon and manganese within the grade composition is an additional factor that ensures intensification and completeness of the γ → α diffusional transformation in the studied steels, thereby improving the overall set of mechanical properties of wire rod in terms of its processability into welding wire by the method of cold plastic deformation (by drawing). 19 Ref., 5 Tabl., 3 Fig.
Keywords: low-carbon alloy steel, wire rod, thermomechanical treatment, microstructure, mechanical properties


Received: 01.10.2025
Received in revised form: 24.11.2025
Accepted: 24.12.2025

References

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