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| 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 |
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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.
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Received: 10 February 2014
Published: 02 February 2015
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2015, Vol. 50 
