| Summary: | The φ11~13 mm SWRH82B steel coil(0.79~0.83C,0.70～0.80Mn,0. 17~0.22Cr,≤0.020S,≤0.025P) for prestressed steel wire and stranded wire has been successfully developed by hot metal pretreatment - 80 t top and bottom combined blown converter - 150 mm×150 mm billet concasting-high speed wire-rod mill process at Xiangtan Steel.The production practice with overheating temperature of liquid steel in tundish controlled between 15 ℃ and 25(30) ℃,casting speed 2.6~2.9 m/min,vibrated value of casting speed ≤ 0.2 m/min,and amount of secondary water cooling between 1.95 L/kg and 2.10 L/kg,the centre carbon segregation ratio of billet(carbon content at centre of billet / carbon content of liquid steel) shall be ≤ 1.04,the sorbite proportion of SWRH82B steel coil ≥ 85%,and during 10000 m drawing and stranding procedure the wire broken ratio ≤ one time.
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