Abstract

Thermo-mechanical controlled rolling (TMCR) schedules have been studied on the wire line of 400/200 section rolling mill to manufacture 6.0 – mm - diameter reinforcing wire in coils by V-alloyed C – Mn – Si - steel that has dual-phase (DP - ferrite-martensite (bainite)) and multi-phase (MP - ferrite-martensite (bainite) - pearlite) microstructures.It has been established that high tensile strength and plasticity values were achieved in this 6.0 – mm wire in coils (YS0.2= 530-550 MPa; TS= 785 – 885 MPa; El5 = 15.0 – 29.0 %) which were in full compliance with national standard specifications such as ASТM A 615 (USA), JIS G 3112 (Japan) and KSD 3504 (the Republic of Korea)), when the TMCR schedules involving laying head temperatures ТLH from 1024 ºС to 1063 ºС were employed ensuring formation of MP microstructure.

Highlights

  • Thanks to a unique combination of tensile strength and placticity properties, high strength low-alloyed dual- and multi - phase (DP – and MP, respectively) steels are usefully applied in the automotive industry for weight reduction of cold-formed components, in the heading industry, in the gas and oil industry for manufacture of transmission pipelines, including those laid in seismic and permafrost regions (Lis, Lis, & Kolan, 2004; Zuo & Zhou, 2015; Sychkov, Zhigarev, & Perchatkin, 2006; Sychkov, Sheksheev, Malashkin, & Kamalova, 2016; Xu & Kong, 2012)

  • The micro-structural analysis has shown that MP - (ferrite-pearlite-martensite(bainite)) structures formed in 6.0 mm-diameter profiled reinforcing wire from V-alloyed C – Mn – Si - steel at higher temperatures TLH under the conditions of rolling schedules 3 and 5, while DP - (ferrite – martensite) structures – at lower temperature TLH under the conditions of rolling schedule 10 (Figure 3, Table 7)

  • scanning electron microscopy (SEM) micrographs of 6.0-mm-diameter profiled reinforcing wire from V-alloyed C – Mn – Si - steel: a, b, c – the microstructures obtained under the conditions of Thermo-mechanical controlled rolling (TMCR) schedules 3, 5 and 10 respectively

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Summary

Introduction

Thanks to a unique combination of tensile strength and placticity properties, high strength low-alloyed dual- and multi - phase (DP – and MP, respectively) steels are usefully applied in the automotive industry for weight reduction of cold-formed components, in the heading industry, in the gas and oil industry for manufacture of transmission pipelines, including those laid in seismic and permafrost regions (Lis, Lis, & Kolan, 2004; Zuo & Zhou, 2015; Sychkov, Zhigarev, & Perchatkin, 2006; Sychkov, Sheksheev, Malashkin, & Kamalova, 2016; Xu & Kong, 2012). / The experimental data allowed the authors of work to conclude, that values of strength properties (Lorusso, Burgueno, Egidi, & Svoboda, 2012), TS YS0.2 - ratio, ultimate elongation El10, Vickers hardness (НV) were close to these obtainable in commercial ATR 500N cold deformed reinforcement wire, could be observed in a obtained wire with a high volume (50%) fraction of martensite after Extension Underload of 2 % (Table 1, DP 820 (2 % EUL)) They state, that the obtained materials had a greater capacity of energy absorption and likewise a higher strength exponent, than traditional commercial products (ATR 500N), offering a promising potential for their use in construction in seismic zones. It is important to study structural and mechanical characteristics of reinforcing wires in coils made from low-alloyed DP – and MP steels subjected to treatment by TMCR on the wire line of a section rolling mill

Materials and Research Techniques
Results and Discussions
Conclusions

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