Study on the Internal Quality of Bridge Steels Q420q Wide and Thick Slab
LI Qiang1,2, WANG Hao3, QIE Jun-mao4
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083,China 2. The Rare Earth Steel Plates Company of Baotou Iron and Steel Co. Ltd., Baotou 014010,Nei Mongol,China 3. The Thin Slab Plant of Baotou Iron and Steel Co. Ltd.,Baotou 014010, Nei Mongol,China 4. The Central Iron and Steel Research Institute ,Beijing 100081,China
Abstract:To investigate the internal defects, such as central segregation and negative segregation, of bridge steel wide and thick slab during production of Baotou Iron and Steel Co. Ltd., the precision of segment soft reduction was increased through adjusting the radian of banana-beam located in the segment of continuous slab caster. At the same time, the cooling uniformity of slab across the width was guaranteed through optimizing the tube of the second cool-down spraying. Thus the central segregation of slab was reduced. In addition, the microstructure of the slab was improved through lowering the current of electromagnetic mixing assembly and the position of electromagnetic mixing roller, and the quality of bridge steels was also improved. The impact of negative segregation of slab on the fault detection and impact property at low temperature was also decreased.
李 强 , 王 皓, 郄俊懋. 宽厚板Q420q桥梁钢铸坯内部质量的研究[J]. 中国钢铁期刊网, 2014, 33(6): 40-45.
LI Qiang,, WANG Hao, QIE Jun-mao. Study on the Internal Quality of Bridge Steels Q420q Wide and Thick Slab. Chinese Journal of Iron and Steel, 2014, 33(6): 40-45.