Investigation and Control of large Inclusion During CSP Thin Slab Continuous Casting Start Process
Author of the article:QIAO Degao;FENG Haijun;FENG Yongping;XIE Jian
Author's Workplace：Jiuquan Iron and Steel(Group)Co.,Ltd.,Jiayuguan 735100,China
Key Words：casting start calcium-aluminum ratio molten steel reoxidation large inclusion defects
Abstract：
The large inclusion defects of high strength automobile steel and household appliance sheet seriously affect the product quality during CSP casting start process in a steel plant.The influencing factors of inclusion defects were studied by means of the SEM,oxygen and nitrogen analyzer and spectral analysis,in terms of process parameters.The results show that the main reasons for the fluctuation of molten steel liquid level in crystallizer during CSP thin slab casting are the large amount of inclusions generated by the secondary oxidation of molten steel,and the unreasonable control of the calcium-aluminum ratio of molten steel,resulting in the poor fluidity of molten steel.Based on the research results,the corresponding control measures are proposed,and the failure rate of secondary large inclusion is reduced by 35.82%during casting start process.
