超高强度预应力钢丝及钢绞线用盘条的开发研究

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

设计和研究了两种超高强度预应力钢丝及钢绞线用盘条87A和90A,通过Gleeble热模拟试验、拉伸试验、金相及扫描电镜观察等分析手段研究了小钢锭、盘条及成品钢丝的组织与力学性能。结果表明,开发的两种高碳钢盘条强度与拉拔性能可以满足2 200及2 300 MPa级预应力钢丝及钢绞线的使用要求,通过对小钢锭生产与工业生产82B及87A盘条组织和力学性能的对比分析,预测工业生产与小钢锭生产90A的性能相当,并根据控冷实践,提出了90A盘条降Si增Mn、Cr及V的合金成分优化想法。

In this paper two hot-rolled steel wire rods for ultra-high strength PC steel wire and strand,i. e.,87 A and 90 A 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 82 B and 87 A wire rods produced by the small and industry-scale ingots,it is reasonably expected that the properties of industrial production of 90 A 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.