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Study on Liquid Steel Behavior in Tundish and Mould for 6-Strand Bloom Continuous Caster

Author: SuZhenJiang
Tutor: WenGuangHua
School: Chongqing University
Course: Iron and steel metallurgy
Keywords: Bloom continuous casting Six flow tundish Mold Flow control devices. Submerged nozzle Electromagnetic stirring Mathematical simulation
CLC: TF777
Type: Master's thesis
Year: 2004
Downloads: 435
Quote: 10
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With the development and optimization of the continuous casting technology, high quality requirements of the slab and the quality of one of the factors affecting billet material is non-metallic inclusions. Studies have shown that the large inclusions in the continuous casting comes mainly from the middle of the package, therefore, to avoid inclusions with steel flow into the mold eventually be removed if it is particularly necessary. Meanwhile, the mold is the heart of the caster, many efficient core technology around the mold and mold related equipment to expand, therefore, insight into and control the flow behavior of the molten steel in the tundish and mold is to ensure the efficient continuous casting process anterograde and improve the the slab quality of key, which people attach great importance to the Note stream flow characteristics in the tundish and mold, the most common method for physical modeling and numerical simulation. This article will use the method of mathematical simulation, in accordance with the the Pangang six flow bloom continuous casting tundish and mold process parameters: the cross-section 280 x 380mm2, 280 × 325 mm2; casting speed of 0.6 ~ 1.1m/min. Study different flow control devices in the tundish and of different submerged nozzle and electromagnetic stirring impact on the behavior of the molten steel in the mold. Due to the the Pangang Six-Strand Bloom Tundish volume, flow spacing, and therefore can not ignore the impact of the natural convection of molten steel flow. Experiments using unequal temperature conditions on the the uncontrolled flow device and controlled flow device intermediate package steel liquid's flow mode, temperature mode inclusions mode and flow field, the initial proposed a generalized \; using tundish multi measured point test the method, research tundish temperature field; comparison of such as mild non-such as temperature situation, the molten steel in the tundish behavior, to prove the non-temperature situation, the middle package plus the necessity of flow control devices. Through analysis combined with the results of the numerical simulation of the above series of experiments, found that \By experiment design series outlet of the fluctuations in the measured liquid level in each outlet, impact pressure, the impact of depth, protective slag covering the results were analyzed; FLUENT software and application design outlet numerical simulation. Found through-type nozzle # 6 and four-hole upward outlet 11 # better meet the continuous casting process requirements. Mold electromagnetic stirring technology can significantly improve the slab solidification structure, inhibit the development of columnar crystals promoting ingredients evenly inclusions refinement uniform distribution, improve the slab cast quality, so that the center porosity, center segregation reduce Center shrinkage and other defects. To this end, this paper also discussed plus electromagnetic stirring in a different outlet types, mold flow and temperature fields distribution. On the basis of the above experiments, the final proposed suitable for the Pangang 6 flow Bloom tundish flow control devices submerged nozzle and mold, and lay the foundation for industrial test applications.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
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