Practice of Protective Casting Process for Thin Slab Continuous Casting and Rolling Production Line

Author of the article:SHI Xinyue, LI Yang

Author's Workplace：Shougang Jingtang Iron and Steel United Co., Ltd., Tangshan 063200, China

Key Words：continuous casting; protective casting; quality

Abstract：Secondary oxidation was easy to occur in the pouring process of molten steel, which leaded to the increase of nitrogen and oxygen content in steel and deteriorates the quality of molten steel. Based on the research on casting process of MCCR thin slab caster in steel rolling department, the influences of self-opening rate of ladle, big ladle casing, flow field of middle ladle and other factors on casting process of MCCR thin slab caster were analyzed, and corresponding protective casting measures were proposed. The results show that the application of protective pouring technology can reduce the degree of oxidation, oxygen absorption and nitrogen absorption of liquid steel, improve the quality of liquid steel, and the qualified rate of aluminum loss and aluminum ratio is above 98%.