Abstract
The aim of the work was to study the influence of vanadium doping on two- and multi-phase steels. The schemes of thermomechanically controlled rolling on the wire line of the sectional rolling mill 400/200 for the production of reinforcing wire with a diameter of 6.0 mm in rolls were studied. For the production of reinforcing wire, vanadium alloyed C – Mn – Si steels, which have two-phase (DP – ferritic-martensitic (bainite)) and multi-phase (MP – ferritic-martensitic (bainite) - pearlitic) microstructures, were used. During thermomechanical controlled rolling, TMCR charts were used, including TLH stacking head temperatures of 1024°C to 1063°C. It was established that the applied rolling modes ensure the formation of the MP microstructure. In this 6.0 mm wire, high tensile strength and ductility indicators were achieved in the bends(YS0.2 = 530-550 MPa; TS = 785-885 MPa; El5 = 15.0 - 29.0 %), which fully corresponded specification requirements of national standards such as ASTM A 615 (USA), JIS G 3112 (Japan) and KSD 3504 (Republic of Korea). Keywords: thermomechanical controlled rolling, wire line, reinforcing wire in bays, V-microalloyed C-Mn-Si-steel, microstructure.
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