Sychkov A.B., Nesterenko A.M., Zavalishchin A.N., Moller A.B., Kulakov B.A., Shubin I.G. Formation of a Microstructure and Mechanical Properties of Dual- and Multi-Phase Reinforcing Steel in Coils

DOI: 10.18503/1995-2732-2023-21-4-70-80

Abstract

Relevance and Objectives. Until recently, in Russia there were several regulatory documents (GOST) specifying the chemical composition, geometric parameters and technical requirements for reinforcing steel in bars and coils, as well as the production method (hot rolling, hot rolling with subsequent thermal hardening in the line of section mills using heat of pre-rolling heating, cold rolling and/or drawing of hot rolled rods) of such products of different strength classes, special technological properties (weldability, resistance to fatigue loads, seismic resistance, etc.). Therefore, given the experience of advanced industrial countries, for example, European Standard EN 10138, since 2018, GOST 34028-2016, a developed standard of a similar class, has been implemented in Russia. According to the requirements of these standards, the production method of reinforcing steel is determined by manufacturers. It is necessary to comply with customer requirements for the parameters and properties of reinforcing steel and ensure a high level of service and operational characteristics of steel products. This research is aimed at solving the currently relevant issue of providing contradictory sets of properties at minimal costs. Objectives. Formation of a microstructure and mechanical properties of dual- and multi-phase reinforcing steel in coils. Results. This paper examines controlled rolling modes on a wire line of an industrial bar and wire rolling mill aimed at producing deformed reinforcing steel bars with a nominal diameter of 6 mm in coils with a dual- (ferrite-martensite(bainite)) and multi-phase (ferrite- martensite (bainite)-pearlite) structure from manganese-silicon low-alloy steel grade 18G2S, microalloyed with vanadium. It has been established that the indicators of high strength and ductility of reinforcing bars with a diameter of 6 mm in coils from steel under study (σт = 530-550 MPa; σв = 785-885 MPa; δ5 = 15.0-29.0%), fully meeting the requirements of the standards for high-strength reinforcing steel, are achieved at coil formation temperatures Тво in the range of 1020-1060ºС, providing the formation of a special multi-phase (ferrite-martensite(bainite)-pearlite) steel structure. Conclusions. The authors determined modes of controlled rolling on the wire line of an industrial bar rolling mill, ensuring the production of deformed reinforcing steel bars with a diameter of 6 mm (No. 6) in coils with a dual- and multi-phase structure from manganese-silicon low-alloy steel grade 18G2S, microalloyed with vanadium. It has been established that indicators of high strength and ductility of reinforcing bars No. 6 are achieved at temperatures Тво in the range of 1020-1060ºС, entailing a formation of a multi-phase structure.

Keywords

reinforcing steel in coils, chemical composition of steel, thermomechanical hardening, microalloying, vanadium, controlled rolling, dual- and multi-phase structure, Stelmore line, ferrite, pearlite, bainite, martensite, technological parameters-modes

For citation

Sychkov A.B., Nesterenko A.M., Zavalishchin A.N., Moller A.B., Kulakov B.A., Shubin I.G. Formation of a Microstructure and Mechanicalproperties of Dual- and Multi-Phase Reinforcing Steel in Coils. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2023, vol. 21, no. 4, pp. 70-80. https://doi.org/10.18503/1995-2732-2023-21-4-70-80

Aleksandr B. Sychkov – DrSc (Eng.), Associate Professor, Professor of the Department of Foundry Processes and Materials Science, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-0886-1601. Researcher ID: E-4516-2016

Anatoly M. Nesterenko – PhD (Eng.), Senior Researcher of the Department of Physical Metallurgy, Institute of Ferrous Metallurgy of the National Academy of Sciences of Ukraine, Dnipro, Ukraine. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0001-2345-6789

Aleksandr N. Zavalishchin – DrSc (Eng.), Professor, Professor of the Department of Foundry Processes and Materials Science, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0003-0955-8425

Aleksandr B. Moller – DrSc (Eng.), Professor, Head of the Department of Materials Processing Technology, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0001-9090-2080

Boris A. Kulakov – DrSc (Eng.), Professor, Professor of the Department of Pyrometallurgy and Foundry Technologies, South Ural State University, Chelyabinsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Igor G. Shubin – PhD (Eng.), Associate Professor, Associate Professor of the Department of Materials Processing Technology, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

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