Study Structure and Properties of Reinforcing Rolled Coils by V-Alloyed C – Mn – Si - Steel with Dual- and Multi-Phase Microstructures

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 (YS 0.2 = 530-550 MPa; TS= 785 – 885 MPa; El 5  = 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 Т LH from 1024 oС to 1063 oС were employed ensuring formation of MP microstructure.