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包钢350km/h高速轨用钢连铸动态轻压下技术应用研究

Study on the Application of Dynamic Soft Reduction Technology in Bloom Casting for 350 km/h High-Speed Rails in Baotou Steel

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【作者】 王国新成永久李峰兰岳光樊精彪赵殿清

【Author】 WANG Guo-xin1,CHEN Yong-jiu2,LI Feng2,LAN Yue-guang2,FAN Jing-biao2,ZHAO Dian-qing2(1.University of Science and Technology Beijing,Beijing 100083,China;2.Baotou Iron &Steel Co,Baotou City 014010,Inner Mongolia,China)

【机构】 北京科技大学包头钢铁集团

【摘要】 铁路的高速、重载化要求钢轨连铸坯具有良好的内部质量,动态轻压下技术是减轻铸坯的中心偏析与疏松缺陷、提升铸坯内部质量的有效途径。针对重轨钢U71Mn、U75V等代表性钢种,在包钢5号连铸机上进行了动态轻压下试验研究,结果表明:合理的动态轻压下工艺可以显著提高重轨钢铸坯的质量,改善重轨钢铸坯的碳元素平均偏差指数,减小钢轨的内伤挑出率,并使包钢普通钢轨的成分偏差达到了高速轨的要求,钢轨性能测试表明,重轨综合力学性能优异,达到了时速350 km高速轨的技术要求。

【Abstract】 High quality of continuously cast Bloom are necessary for High-speed rail steel.Dynamic Soft Reduction is a particularly effective method of reducing central segregation and porosity and hence improving the internal quality of continuously cast bloom.In this paper,focused on typical steel grades such as heavy rail steel U71Mn and U75V,metallurgical effect experiments on aplication of dynamic soft reduction have been carried out on No.5 bloom caster in Iron & Steel Co.of Baotou,results show that when the reasonable Dynamic Soft Reduction technology is adopted the quality of heavy rail steel is improved obviously,the index of even carbon element deviation of bloom becomes better,ratio of substandard heavy rail decreases,compositions deviation of ordinary heavy rail reaches the standard of heavy rail being used by train with high speed,and the synthetic mechanical properties of heavy rail can meet the requirements of 350km/ h high-speed track rails.

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