【作者】 许志刚； 王新华； 姜敏； 周力； 王万军； 赵和明； 尹雨群；

【Author】 Xu Zhigang~1 Wang Xinhua~1 Jiang Min~1 Zhou Li~1 Wang Wanjun~1 Zhao Heming~2 Yin Yuqun~3 (1.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing Beijing 100083,China; 2.Xinyu Iron2 and Steel Co.Ltd.,Xinyu 338001 Jiangxi,China; 3.Research Institute of Nanjing Iron and Steel Co.Ltd.,Nanjing 210035 Jiangsu,China)

【机构】 北京科技大学冶金与生态工程学院； 新余钢铁股份有限公司； 南京钢铁研究院；

【摘要】 本文研究了过热度和压下量对中厚板坯的中心偏析和中心疏松的影响,结果表明,高过热度浇注时中心为柱状晶组织,中心偏析线由面积较小的独立的半宏观偏析点在厚度中心汇厂聚而成;低过热度浇注时,中心形成较为粗大的等轴晶粒,铸坯厚度中心并无明显的中心偏析线,然而半宏观偏析点分散在整个等轴晶区中。在轻压下作用下,高过热度更有利于改善中心偏析和中心疏松,且随着压下量的增加,其改善效果越明显。基于中厚板坯的研究结果,本文开发了厚板坯的压下技术(START技术),结果表明START技术可以很好的改善厚板坯的中心质量,基本消除了厚板坯厚度中心体积较大的疏松缺陷。更多还原

【Abstract】 The effects of supper heat and soft reduction amounts on the center segregation and center porosity of medium-thick slabs were investigated.As with high temperature casting,columnar structure is formed in the center of thickness,and the centerline is observed composing of a series of small and independent semi-macro segregates;while equiaxed granular structure is formed in the center with low temperature casting,no evident centerline is observed,however,the semi-macro segregates are dispersed across the equiaxed zone.It is found out that the high temperature casting is more favorable for the improvement of centerline segregation and center porosities with the application of soft reduction.Moreover,as the soft reduction amounts increased,the appearance of improvement is more remarkable.Based on the results described above,the Specially-Thick StrAnd Reduction Technique(START) is developed to improve the center quality of thick slabs,the results show that centerline segregation and center porosities are reduced greatly by the application of START,especially,the larger porosities in the center of thickness are almost eliminated.更多还原