学术
重轨钢连铸坯内部质量控制技术
陈永[1,2] 杨素波[3]
[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]攀枝花钢铁研究院材料研究所,四川攀枝花617000 [3]攀枝花新钢钒股份有限公司提钒炼钢厂,四川攀枝花617062
摘 要:
针对攀钢大方坯连铸机投产初期重轨钢连铸坯中心疏松、中心偏析等内部缺陷较严重的问题，研究应用了提高重轨钢连铸坯内部质量的控制技术，包括凝固末端动态轻压下、结晶器电磁搅拌、二冷动态控制、连铸拉速与钢水温度优化控制等核心工艺技术。生产实践表明，重轨钢连铸坯综合合格率达到99．97％，铸坯中心疏松≤1．0级，中心偏析≤1．0级，中心缩孔≤1.0级，中心裂纹≤0．5级，中间裂纹≤0．5级，角部内裂≤0．5级，中心碳偏析指数≤1．05，由连铸坯轧成重轨的内部质量和力学性能满足时速350km高速铁路用钢轨的要求。[著者文摘]
文章出处:
《钢铁研究学报》-2007年19卷10期 -16-20页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1001-0963（2007）10-0016-05
Internal Quality Control of Continuously Cast Bloom for Heavy Rail Steel
CHEN Yong, YANG Su-bo （1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China; 2. Department of Material Research, Panzhihua Iron and Steel Research Institute, Panzhihua 617000, Sichuan, China; 3. Vanadium Recovery and Steelmaking Plant, Panzhihua New Steel and Vanadium Co Ltd, Panzhihua 617062, Sichuan, China）
Abstract:
The rail bloom central defects, such as central segregation and center looseness were severe during the initial production of the 6-strand bloom caster at Panzhihua Iron and Steel Group. Therefore, the key technologies for internal quality control of continuously cast bloom, such as dynamic soft reduction, M-EMS, secondary cooling scheme, casting speed and molten steel temperature mode were investigated. The operation shows that the bloom qualified rate achieves 99.97% of total blooms produced from CC, center looseness and central segregation and shrinkage cavity are 41.0, while, central crack and intercolumnar crack and corner crack are 40.5, and central segregation index of carbon is 41.05. Internal quality and mechanical performance of the rails produced from continuously cast blooms have met the requireme.nt of high speed 350 km/h tracks.[著者文摘]
Key words:
rail steel ; bloom continuous casting ; dynamic soft reduction ; M-EMS ; secondary cooling scheme
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