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| Physical Modeling and Industrial Practice of Argon Bottom Bubbling in Tundish |
| TAO Liqun1,2,JIANG Maofa1,WANG Deyong1,XUE Wenhui2,JIANG Xuefeng2 |
| 1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;2. Steelmaking Plant, Benxi Iron and Steel Group Co., Benxi 117021, Liaoning, China |
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Abstract By means of physical model and industrial practice, the influence of argon bubbling into tundish via porous plug on the fluid flow and inclusion removal was performed. The physical modeling showed that, argon bubbling can remarkably improve the fluid flow characteristics, increase residence time, and enhance mixture degree of liquid steel, and decrease dead volume. The smaller the distance between the porous plug and outlet, the stronger the influence of argon bubbling on the fluid flow characteristics is. Because, the movement track of liquid steel is improved by the argon bubbling and route of fluid flow is much more flexuous and close to the bath surface. The industrial practice showed that, the “gas bubbling curtain” formed by argon bubbling is a potential means to enhance inclusion removal. Compared with the slab cast without Ar bubbling, the inclusion index of the slab cast with argon bubbling was decreased from 7.338.98 mg/（10 kg） to 4.214.33 mg/（10 kg）, especially, the amount of big inclusions was decreased more obviously. In the slab cast with Ar bubbling, no 3050 μm size inclusions was observed.
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Received: 01 January 1900
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2006, Vol. 41 