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对超高强度桥梁缆索用钢SWRS87B的CCT曲线进行了测定,同时对斯太尔摩风冷线盘条温度、盘条显微组织、索氏体片层间距、力学性能进行测定,分析了风冷强度对盘条显微组织的影响。结果表明,斯太尔摩风冷线4~7号风机开量分别为80%、90%、100%时,盘条组织分别为索氏体、索氏体、索氏体+马氏体,索氏体片层间距分别为178、127、114 nm。当4~7号风机开量分别为90%时,盘条在珠光体相变区停留时间28 s,平均相变温度598.4℃,盘条无马氏体组织出现,索氏体片层间距127 nm,盘条抗拉强度1350 MPa,成品镀锌钢丝强度为2023 MPa,平均扭转次数为28次,为最佳生产工艺。
The CCT curve of SWRS87B for ultra-high strength bridge cable steel was measured. The temperature of wire rod, the microstructure of wire rod, the spacing of sorbite layer and the mechanical properties were measured. The effects of wind Effect of cold strength on the microstructure of wire rod. The results show that when the blower opening of Nos. 4 ~ 7 of the Steyr-Frostwind line is 80%, 90%, 100% respectively, the wire rod organization is sorbite, sorbite, sorbite + martensite, Sorbitol sheet spacing were 178,127,114 nm. When the fan opening of No.4 ~ No.7 was 90%, the wire rod stayed in the pearlite transformation zone for 28 s, the average transformation temperature was 598.4 ℃, no martensite was found in the wire rod, and the sorbitol layer spacing was 127 nm, the tensile strength of the wire rod is 1350 MPa, the strength of the finished galvanized steel wire is 2023 MPa and the average number of twisting times is 28 times, which is the best production technology.