Study on Hot-rolled Steel Wire Rod for Ultra-high Strength PC Steel Wire and Strand

In this paper two hot-rolled steel wire rods for ultra-high strength PC steel wire and strand,i.e.,87A and 90A have been studied by the method of gleeble thermal-mechanical simulation,tensile test,metallographic phase and scanning electron microscopy,the microstructure and mechanical properties of the small ingot,wire rod and steel wire.The results show that the tensile strength and drawing performance of the two high carbon steel can meet the requirements of 2 200 and 2 300 MPa PC steel wire and strand.Through comparing the microstructure and mechanical properties of 82B and 87A wire rods produced by the small and industry-scale ingots,it is reasonably expected that the properties of industrial production of 90A steel wire rod was consistent with that of the small ingot.According to the Stelmor cooling practices,the optimization of alloy composition,i.e.,increasing the content of Mn,Cr and V and decreasing Si,was proposed.