武钢客运专线用百米钢轨的开发与应用.pdfVIP

武钢客运专线用百米钢轨的开发与应用 叶途明 熊建良 陈清泉 王金平 陈光友 （武汉钢铁（集团）公司条材总厂，武汉 430083 ） 摘 要 简要介绍了武钢生产的客运专线用百米钢轨的冶炼和轧制相关情况，对其生产设备和工艺流程进行了介 绍。分析了钢轨钢铁水预处理、转炉冶炼、炉外精炼、真空处理、连铸、加热、轧制和矫直等相关工艺的控制措施 及取得的效果。钢轨钢通过炉外精炼、RH 真空脱气后，其氢和氧含量分别控制在 1.5ppm 和 20ppm 以内。钢轨的 连铸过程中采取了全程保护浇注、低过热度低拉速、低比水量、凝固末端轻压下、保护渣优化等技术后，其中心偏 析、疏松、缩孔和角部缺陷等都得到了有效地控制。通过优化铸坯的加热温度、加热时间等措施，使得钢轨的脱碳 合格率达到了 99% 以上；通过优化轧制工艺，高速钢轨的表面质量合格率由以前的 80%左右提升至 90%；通过均 匀分配头、底、腰等部位的压下量，合理选择导卫装置，优化预弯曲线等方法，使得高速钢轨的的平直度合格率达 到了 99% 以上。采用相关的冶炼和轧制技术生产的 U71Mnk 钢轨，成品经中国铁道科学院检验后，其内部和外部 质量达到了铁道部客运专线钢轨的要求。1 关键词 钢轨 真空处理 大方坯 末端轻压下 脱碳层 平直度 Development and Application of High-Speed Heavy Rail with 100m for Passenger Dedicated Lines in WISCO Ye Tuming Xiong Jianliang Chen Qingquan Wang Jinping Chen Guangyou （Long Product General Plant of WISCO, Wuhan, 430083 ） Abstract The interrelated production of heavy rail steel with 100 m for the passenger dedicated lines in WISCO is briefly introduced, and the equipments and process route for heavy rail steel are also introduced. The correlative technical control measures and its results of hot metal pre-treatment, converter smelting, secondary refining, vacuum treatment, continuous casting, heating, rolling and straightening of heavy rail steel are analyzed. Through secondary refining and RH vacuum degassing, its hydrogen and oxygen content of heavy rail steel were controlled at less than 1.5ppm and 20ppm respectively. After some technologies such as full-course protective casting, low superheat and low casting speed, low spray water rate, soft reduction of final stage of solidification and powder optimizing etc were adopted, the center segregation, shrinkage, porosity and longitudinal comer crack of heavy rail steel were effectively controlled.