钒、铬微合金化地铁车轮用ER7钢的生产实践

Production of Subway Wheel Steel ER7 with Micro-alloying of Vanadium and Chromium

通过对地铁用车轮用钢ER7的生产工艺、产品性能等进行研究,采用"转炉-LF炉-VD炉-圆坯连铸"生产工艺路线,采取钒、铬微合金化,同时对钙处理方式及硫线加入时机进行优化,控制钢水过热度,调整二冷水量及末端搅拌参数,使铸坯的碳偏析、中心疏松及缩孔得到有效控制,产品性能完全满足地铁车轮对强度、韧性、塑性及抗疲劳性能的要求。

The producing process an of LD-LF-VD-CC, by micro-alloying d properties of subway wheel steel ER7 is researched with the routine of vanadium and chromium, calcium treatment and sulfur wire-feed- ing. Carbon segregation, center porosity and shrinkage cavity was effectively improved by steel superheat, second cooling and F-EMS parameter control. The properties of steel, such as the strength, ductility, plasticity and anti-fatigue is qualified.