Castability improvement of high Ti-bearing welding wire steel
DENG Xu-yan1,2， MA Jian-chao1，ZHAO Wei-jie1
1. Institute of Research of Iron and Steel of Jiangsu Shasteel， Zhangjiagang 215625， Jiangsu， China 2. Dalipal Pipe Group Co.， Ltd.， Cangzhou 061000， Hebei， China
Abstract：Severe SEN (Submerged Entry Nozzle) clogging issue occurred in the continuous casting process of high Ti-bearing welding wire steel. The chemical composition of clogs was characterized using SEM/EDS. The results indicate that the major constituent phases are [TiOx] and solidified steel. The morphology and chemical composition of inclusions in liquid steel were analyzed by SEM/EDS. The results show the inclusion types at LF end are [MnO-Al2O3-SiO2-TiOx]， [MgO-Al2O3-TiOx] and [TiOx]. The Ti-bearing inclusions with high melting point in liquid steel are the dominant reason to SEN clogging. Al-Ti-O equilibrium in liquid steel and steel-slag equilibrium were calculated by thermodynamic method. The results show oxygen is preferred to combine with Ti to form Ti2O3 when [w([Al])/w([Ti])＜0.15]， otherwise， oxygen is preferred to combine with Al; the titanium would not be oxidized by slag when [w((FeO))][＜]0.05%， [w((SiO2))][＜]15% in ladle slag. TiOx inclusion content in liquid steel is reduced from 0.002 4% to below 0.001% after the process parameters and operation are optimized; hence， the castability of liquid steel is improved significantly.
收稿日期: 2014-02-10
出版日期: 2015-02-02
引用本文:
邓叙燕，马建超，赵伟杰. 高钛焊丝用钢的钢液可浇性改善[J]. 钢铁, 2015, 50(2): 32-37.
DENG Xu-yan，， MA Jian-chao，ZHAO Wei-jie. Castability improvement of high Ti-bearing welding wire steel. Iron and Steel, 2015, 50(2): 32-37.
2015, Vol. 50 
