Source analysis and control of large inclusions in Q195 hot rolled strip
WANG Bo1,2, ZOU Ping3, SUN Xiu-bing3, LI Jian-jun3, SUN Li-gen1,2, ZHU Li-guang1,2
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Hebei Province High Quality Steel Continuous Casting Engineering Technology Research Center, Tangshan 063210, Hebei, China; 3. Equipment Department, Tangshan Songting Iron and Steel Co., Ltd., Tangshan 063000, Hebei, China
Abstract：Large inclusions have an important influence on the surface quality of hot rolled strip. Tracer experiment and large sample electrolysis were used to analysis the source, composition and content of large inclusions in Q195 hot rolled strip. At the same time, the top slag of ladle and tundish was analyzed and then effective measures were proposed. The results showed that the major inclusions were Al2O3-SiO2-MnO, SiO2-MnO and SiO2. The particle size ranged from 50 to 2 000 μm, and the content ranged from 40 mg/10 kg to 145 mg/10 kg. The main sources of inclusions were ladle, tundish top slag and drainage agent. Besides, it was found that the oxygen content of top slag of ladle and tundish is higher and the basicity is lower. The covering agent of ladle and tundish should be optimized and the basicity should be improved to remove inclusions by adsorption.
王博, 邹平, 孙秀兵, 李建军, 孙立根, 朱立光. Q195热轧带钢大型夹杂物来源分析及控制[J]. 中国冶金, 2021, 31(8): 60-65.
WANG Bo, ZOU Ping, SUN Xiu-bing, LI Jian-jun, SUN Li-gen, ZHU Li-guang. Source analysis and control of large inclusions in Q195 hot rolled strip[J]. China Metallurgy, 2021, 31(8): 60-65.
2021, Vol. 31 
