架空导线用特强预应力钢芯制备与性能表征

随着以新能源为主体的新型电力系统逐步构建，架空输电线路对大规模清洁能源的大容量、安全高效输送能力的提升成为电力行业关注的热点。基于优化成分的高碳钢盘条以及适配的加工工艺，制备出抗拉强度大于2 100 MPa、伸长率不小于4.8%、锌铝合金镀层质量不低于320 g/m²的特高强度预应力镀锌铝钢线。绞合制成的预应力钢芯1 000 h应力松弛率为4.178%。在此基础上开展了特强高导预应力钢芯软铝增容导线的设计研制，为该新型增容导线产品的国产化开发与工程应用提供了技术支撑。

Preparation and performance characterization of ultra high strength prestressed steel core for overhead conductor

As the gradual construction of new power system with new energy as the main body, how to improve the high-capacity, safe and efficient transmission capacity of overhead transmission lines is becoming a hot topic for the power industry. Based on the high carbon steel wire rod with optimized composition and the appropriate processing technology, an ultra-high strength prestressed steel wire with zinc-aluminum alloy coatings was prepared, whose tensile strength was more than 2 100 MPa, elongation was no less than 4.8%, the zinc aluminum alloy coating weight was more than 320 g/m2, and the 1 000 h stress relaxation rate of stranded prestressed steel core was 4.178%. On this basis, the design and development of supper-strong and high conductivity prestressed steel core soft aluminum conductor was designed and developed, which provided technical support for the localization development and application of the new compatibilization conductor.