DOI:10.52150/2522-9117-2026-40-007

V. I. Kozechko¹, Ph. D., ORCID 0000-0003-2370-1603
D. V. Laukhin¹, D. Sc. (Tech.), Professor, ORCID 0000-0002-9842-499X
O. V. Beketov^2,*, D. Sc. (Tech.), Assoc. Prof., ORCID 0000-0003-0664-0327
T. Ie. Romanenko², ORCID 0000-0003-3590-837X
S. V. Kuznetsov², ORCID 0009-0006-4769-0725
D. I. Mamchur², ORCID 0009-0000-1385-8442

¹ Dnipro University of Technology
² Ukrainian State University of Science and Technologies
^*Corresponding author: beketov.oleksandr@pdaba.edu.ua

QUANTITATIVE ANALYSIS OF THE INTERRELATIONSHIP BETWEEN THE THICKNESS OF ROLLED METAL PRODUCTS AND THE COMPLEX OF MECHANICAL PROPERTIES OF 10G2FB STEEL

Abstract. The main engineering task in the design of welded building structures, including those of critical purpose, is to calculate the relationship between the stress-strain state that arises under the influence of external loading and the kinetics of fracture initiation and propagation. The current regulatory design documentation does not take into account the structural state of the material, which has a direct impact on both the formation of the stress-strain state (a complex of mechanical properties) and, as a result, on the processes of fracture initiation. This work is devoted to the study of the quantitative relationship between the complex of mechanical properties of 10G2FB steel and the corresponding structural state, taking into account the thickness of the rolled metal. The work analyzes the relationship between the structural state that is formed in low-carbon low-alloy steel 10G2FB and the indicators of mechanical properties, namely: yield strength, tensile strength, relative elongation, relative elongation. The performed complex of metallographic studies showed that for all studied thicknesses the structure of the steel is a ferrite-pearlite conglomerate. Using the mathematical apparatus of one-dimensional regression analysis, the corresponding mathematical models were constructed, the adequacy of which was proven by using the quasi-Newton method of residues. Analysis of the obtained data showed that with an increase in the thickness of the rolled metal, a decrease in the yield strength is observed with a simultaneous increase in the strength limit. This fact is explained by changes in the structural state of the material, namely, an increase in the percentage content and size of the pearlite component. The dependence of the plastic properties (relative elongation, relative elongation) on the thickness of the rolled metal is also explained by a simultaneous increase in the percentage content of pearlite with a decrease in the amount of the ferrite component.

Key words: low-carbon low-alloy steel, structural state of the material, mathematical modeling, thickness of rolled metal, complex of mechanical properties.

For citation: Kozechko, V. I., Laukhin, D. V., Beketov, O. V., Romanenko, T. Ie., Kuznetsov, S. V., & Mamchur, D. I. (2026). Quantitative analysis of the interrelationship between the thickness of rolled metal products and the complex of mechanical properties of 10G2FB steel. Fundamental and applied problems of ferrous metallurgy, 40. 110-121. https://doi.org/10.52150/2522-9117-2026-40-007

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Рукопис надійшов до редакції / Received 06.03.2026
Рекомендовано до друку / Accepted 28.05.2026
Опубліковано / Published 30.05.2026