Influencing Factors on Center Segregation in Continuously Cast Pipeline Steel Slabs

作     者：LIU Yang1, WANG Xin-hua2, WANG Wen-jun1, JIANG Zhong-hang1 (1.Shougang Research Institute of Technology Beijing 100043 china 2.University of Science and Technology Beijing 100083, China) 

作者机构：Shougang Res Inst Technol Beijing Beijing 100043 Peoples R China Univ Sci & Technol Beijing Beijing 100083 Peoples R China 

出 版 物：《Journal of Iron and Steel Research International》 (钢铁研究学报(英文版))

年 卷 期：2011年第18卷第S2期

页      面：352-357页

核心收录：

学科分类：080602[工学-钢铁冶金] 0806[工学-冶金工程] 08[工学] 

主　　题：continuous casting slab, center segregation, microalloy steel 

摘      要：The factors which influence center segregation of continuously cast slabs are obtained through analyzing the database of macrostructrue. It indicates that center segregation becomes severer with the increasing content of carbon, phosphorus and sulfur; Center segregation will be reduced obviously if the content of manganese is higher than 1.5% and the ratio of Mn/S is higher than 300; High degree of superheat , high casting speed and increasing width of slabs will increase the degree of center segregation. Since center segregation below class B has little effect on the property of steel, hence, in order to low the ratio of center segregation of class B-1.0 down to 10%, several control strategies are presented as follows: the contents of carbon, phosphorus and sulfur must be focalized in lower range of steel grade demanded, but manganese upper operating range control. The referenced contents of the elements in molten steel are required like this: [C]1.5%,[Mn]/[S]300; The degree of superheat should be lower than 24℃ and the casting speed should be defined to 1.0-1.1 m·min-1. At the same time, proper secondary cooling system of water distribution should be developed and the precision of continuous caster should be also improved.