Formation Mechanism of CaO-SiO 2 -Al 2 O 3 -(MgO) Inclusions in Si-Mn-Killed Steel with Limited Aluminum Content During the Low Basicity Slag Refining
作者： Kunpeng Wang , Min Jiang , Xinhua Wang , Ying Wang , Haoqian Zhao
DOI: 10.1007/S11663-015-0502-Z
关键词:
摘要: Pilot trails were carried out to study the formation mechanism of CaO-SiO2-Al2O3-(MgO) inclusions in tire cord steel. 48 samples taken from 8 heats liquid steel during secondary refining, which subsequently examined by an automatic scanning electron microscope with energy dispersive spectrometer (SEM–EDS). Characteristics thousands oxide at different refining stages obtained, including their compositions, sizes, morphologies, etc. Based on obtained information inclusions, details revealed and a new was proposed, origin, formation, evolution process. It found that initially originated CaO-SiO2-MnO-(MgO) formed BOF tapping coalescence between MnO-SiO2 deoxidation products emulsified slag particles because violent flow This can be well confirmed evaluation thermodynamics proved very difficult produced intrinsic reactions inside Because chemical molten steel, they mainly changed into CaO-SiO2-MnO-Al2O3-(MgO) partially CaO-SiO2-Al2O3-(MgO), may detrimental cold drawing ability coils. this finding, improvements made industrial production refining. The results indicated such (CaO-SiO2)-based existed conventional process effectively decreased after improvements.
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