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

摘要

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 ASTM A 615 (USA), JIS G 3112 (Japan) and KSD 3504 (the Republic of Korea)), when the TMCR schedules involving laying head temperatures Tlh from 1024 ℃ to 1063 ℃ were employed ensuring formation of MP microstructure.