Stopper rod, tundish and method for removing inclusions from liquid metal
A technology of liquid metal and inclusions, applied in the field of metallurgy, can solve problems such as nozzle nodulation and incomplete removal of inclusions
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Embodiment 1
[0072] Such as figure 1As shown, a stopper rod is cylindrical as a whole, including a stopper rod body 1 and an inclusion reaction layer 2 arranged on the surface of the stopper rod body 1 .
[0073] Inclusion reaction layer 2, calculated by mass percentage, includes: Al 2 o 3 75%, MgO 6%, SiO 2 5%, SiC 4% and C 10%; the physical and chemical properties of the inclusion reaction layer are: apparent porosity 15%, compressive strength 30MPa, flexural strength 15MPa, thermal shock times 10 times, density 2500kg / m 3 .
[0074] In the production of molten aluminum deoxidized steel, due to the limited refining time, alumina inclusions (Al 2 o 3 ) failed to fully float up for removal. For the alumina inclusions that cannot be completely removed, the above-mentioned stopper rods are used for the 8-machine 8-strand tundish in the continuous casting process. Since the 8-flow tundish requires 8 stopper rods with a large contact area, air cooling is selected as the cooling method...
Embodiment 2
[0076] Such as figure 2 As shown, a stopper rod includes a stopper rod body 1 , an inclusion reaction layer 2 arranged on the surface of the stopper rod body 1 , and a stopper rod core 3 arranged in the stopper rod body 1 . The stopper body 1 is in the shape of a hollow cylinder, one end is provided with an opening 4 for loading or removing the stopper core 3, and the opposite end of the opening 4 is provided with a stopper head 5; the material of the stopper body 1 is graphite; The material of stopper tip 5 is corundum. The stopper rod core 3 includes a cooling pipe 6 for circulating a cooling medium (water cooling is preferably a cooling coil) and a heat transfer medium filled between the cooling pipe 6 and the stopper rod body 1; the cooling medium is water, and the heat transfer medium is graphite powder .
[0077] Inclusion reaction layer 2, calculated by mass percentage, includes: Al 2 o 3 10%, MgO 80%, SiO 2 2%, SiC2% and C 6%; the physical and chemical properti...
Embodiment 3
[0081] The stopper rod used in this embodiment has the same structure as that provided in embodiment 2. The difference is that the inclusion reaction layer 2, calculated by mass percentage, includes: Al 2 o 3 40%, MgO 50%, SiO 2 2%, SiC 3% and C 5%; the physical and chemical properties of the inclusion reaction layer are: apparent porosity 8%, compressive strength 30MPa, flexural strength 20MPa, thermal shock times 15 times, density 2650kg / m 3 .
[0082] In the production of calcium-treated aluminum deoxidized molten steel, due to the limited refining time, high melting point calcium-aluminate inclusions (CaO·Al 2 o 3 ) failed to fully float up for removal. For the calcium-aluminate inclusions that cannot be completely removed, the above-mentioned water-cooled stopper rod is used to react with the inclusions to increase the content of alumina and magnesium oxide in the inclusions, increase the melting point of the inclusions, and make them easy to precipitate and adhere...
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Abstract
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