Properties and structure of a new non-reactive mold flux for high-Al steel

• 作者: Yang Chen Sheng-ping He Zhi-rong Li Xu-bin Zhang Qiang-qiang Wang Qian Wang
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 61-70
• 页数: 10页
• 语种: 英文

摘要

During the conventional continuous casting process of high-aluminum steels(w([Al])＞0.5 wt.％),some components of slag,such as SiO2,B2O3,and TiO2,could be reduced by aluminum in molten steel.Therefore,the CaO-BaO-Al2O3-CaF2-Li2O non-reactive mold fluxes were designed using the simplex grid method and molecular dynamics to mitigate the slag-metal interface reaction and stabilize the performance of mold fluxes.The results show that the components of non-reactive quinary system are 20-40 wt.％CaO,14-34 wt.％BaO,14-34 wt.％Al2O3,4-12 wt.％F,and 4-8 wt.％Li2O.Molecular dynamics simulation results show that[AlO4]-tetrahedron acts as network formers and melt network structure is mainly chain and lamellar in the low-viscosity area.The cross sections of w(F)=8 wt.％,w(Li2O)=8 wt.％and w(F)=12 wt.％,w(Li2O)=8 wt.％are important reference sections for the design of mold flux,with the compositions of 22-40 wt.％CaO,14-34 wt.％BaO,20-34 wt.％Al2O3 and 23-40 wt.％CaO,14-34 wt.％BaO,20-28 wt.％Al2O3,respectively.