Prediction of composition distribution of non-metallic inclusions in a billet
ZHANG Yue-xin1, ZHANG Li-feng2, WANG Ju-jin1, NIU Kai-jun1, WANG Ya-dong1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
Abstract：In order to study the spatial distribution of non-metallic inclusions in continuous casting billet, the variation of the average composition of inclusions in a cord steel billet from the loose side to the fixed side was analyzed. With the increase of the distance from the surface layer of the billet, the SiO2 content ascended significantly from 53% to about 75% firstly, and then declined to 60%. While the change of MnO content in inclusions declined to 12.59% firstly, and then ascended to 27.87%. The contents of CaO and Al2O3 inclusions changed little. An integrated model coupled with heat transfer, solidification, thermodynamic transformation of inclusion composition, and diffusion of dissolved elements in steel was established to predict the composition distribution of inclusions in the continuous casting billet. The calculated variation trend of oxide inclusion composition was consistent with the experimental one, which verified the accuracy of the model. Meanwhile, the evolution of inclusions in continuous casting billets of different total aluminum, total calcium, and total oxygen content was studied by using the model. The content of total aluminum had the greatest influence on the composition distribution of inclusions. When mass pertent of total aluminum increased from 0.000 1% to 0.001 0%, mass percent of SiO2 decreased from 57%-64% to 34%-39%; mass percent of Al2O3 increased from 8%-10% to 37%-41%; the content of MnO changed little; and mass percent of CaO decreased from 13%-17% to 8%-10%.
张月鑫, 张立峰, 王举金, 牛凯军, 王亚栋. 连铸坯全断面非金属夹杂物成分分布的预报[J]. 钢铁, 2021, 56(10): 74-82.
ZHANG Yue-xin, ZHANG Li-feng, WANG Ju-jin, NIU Kai-jun, WANG Ya-dong. Prediction of composition distribution of non-metallic inclusions in a billet[J]. Iron and Steel, 2021, 56(10): 74-82.
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2021, Vol. 56 
