湘钢预应力钢丝用钢SWRH82B盘条的质量控制

湘钢采用铁水预处理-80t顶底复吹转炉-90 t LF-150 mm ×150 mm方坯连铸机-高速线材轧机成功开发出Φ11~13mm的预应力钢丝和钢绞线用钢SWRH82B(%:0.79~0.83C,0.70~0.80Mn,0.17~0.22Cr,≤0.020S,≤0.025P)盘条。实践表明,中间包钢水过热度控制在15~25(30)℃,拉坯速度2.6~2.9m/min,拉坯速度波动值≤0.2m/min,二冷水量1.95~2.10L/kg,可使铸坯中心碳偏析比(铸坯中心碳含量/钢水碳含量)≤1.04,盘条索氏体率≥85%,实际拉拔和捻股过程中10⁴m的断丝率≤1次。

Quality Control of SWRH82B Steel Coil for Prestressed Wire at Xiangtan Steel

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.