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10
4
m的断丝率≤1次。
Abstract
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.