2 200 MPa级超高强度钢绞线用盘条工业试制  

Industrial Trial Production of Wire Rod for 2200 MPa Ultra-high Strength Steel Strand

作　　者：赵晓敏[1,4] 牛斌 涛雅[1] 石龙[2] 银志军[3] 苏永华 Zhao Xiao-min;Niu Bin;Tao Ya;Shi Long;Yin Zhi-jun;Su Yong-hua(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Railway Engineering Research Institute of China Academy of Railway Sciences Corp.,Ltd.,Beijing 100081,China;Steel-making Plant of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]中国铁道科学研究院铁道建筑研究所,北京100081 [3]内蒙古包钢钢联股份有限公司炼钢厂,内蒙古包头014010 [4]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《包钢科技》2023年第1期55-60,共6页Science & Technology of Baotou Steel

基　　金：铁路桥梁超高强度缆索体系关键技术研究,中国铁道科学研究院项目(2020YJ035)。

摘　　要：以SWRH82B化学成分为基础,设计2200 MPa级超高强钢绞线用盘条化学成分,采用280 mm×380 mm连铸坯通过二火开坯轧制成Φ14 mm盘条,优化盘条冷却速度使热轧盘条抗拉强度由1150 MPa提高到1450 MPa以上,拉拔后实现了钢绞线的强度达到2200 MPa以上的目标。工业试制结果表明:软吹时间、深真空时间是控制非金属夹杂物尺寸和钢中氧含量的关键,软吹时间、深真空时间要大于15 min;在拉速恒定的条件下,过热度35℃以下,中心宏观偏析指数可控制在1.15以下;控制适中的冷却速度可以得到理想的索氏体组织,最佳冷却速度为4.89~5.62℃/s。The chemical composition of wire rod for 2200 MPa ultra-high strength steel strand is designed based on the chemical composition of SWRH82B.TheΦ14 mm wire rod is rolled by second heating and cogging with 280 mm×380 mm continuous casting billet.The tensile strength of hot rolled wire rod is increased from 1150 MPa to over 1450 MPa by optimizing the cooling rate of wire rod.The target that the strength of steel strand reaches over 2200 MPa after drawing is realized.The results of industrial trial production showed that the time of soft blow and deep vacuum was the key to control the size of non-metallic inclusions and oxygen content in steel as well as it should be more than 15 min;under the condition of constant casting speed and the degree of superheat is below 35℃,the center macrosegregation index could be controlled below 1.15;the ideal microstructure of sorbite could be obtained by controlling moderate cooling rate and optimum cooling rate was 4.89~5.62℃/s.

关 键 词：2200 MPa超高强钢绞线用钢 连铸 内部质量 组织性能 

分 类 号：TG335[金属学及工艺—金属压力加工]