The effect of continuous casting long nozzle

 In the continuous casting operation, the long nozzle is located at the sliding nozzle of the ladle, and its main function is to prevent the molten steel from contacting the atmosphere and oxidizing when it flows to the tundish.?

Compared with the submerged entry nozzle, the long nozzle has a higher probability of cracks or breakage during use, so in the process of material selection, more attention should be paid to its crack resistance. Because in terms of appearance, the long nozzle is larger and heavier, and the mechanical shock is much greater whether it is during installation or use. Moreover, compared with the submerged entry nozzle, the long nozzle does not have a special preheating device, so it needs to withstand more severe heat during use.

For the corrosion resistance of the long nozzle, these parts are mainly emphasized.

1. The position in contact with molten steel;
2. The position where it is immersed in the inner hole and the slag line.

Since the joint between the long nozzle and the ladle is easy to enter air, the molten steel at this location is prone to oxidation and corrosion.

Article Source:The effect of continuous casting long nozzle
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Delelopment of continues casting & tundish

CCM first appear in 1950s, it is characterized by fast casting and focus investment. CCM technology was developing in a very fast speed. In Year 1970, CCM only took 5.6% all over the world, while the data reached 62.4% in Year 1990, and in some developed countries, it was even 95%. In recent years, many steel plants adapted CCM instead of mould casting. Until Year 1994, in total 24 countries are of full CCM now.

Compared with traditional mould casting, CCM can improve metal recycle rate and low down power consumption. CCM can make the melting work simple and short the melting time, in which way the production efficiency can improve in a large degree. Tundish is a middle progress of steel making, and it is the kep point which can decide continues casting or not. Furthermore, tundish would have a big effect on melten steel quantity and quality. Its functions are as following,

1.Diversion. For multi-strand CCM machine, the melten steel would be divided from tundish.

2.Continues casting. When multi-furnace continuous casting, tundish can be a holder when changing ladle.

3.Lowing down presure.

4.Protecting melten steel quality. Through using covering agent, long nozzle and other protecting device, tundish can help to protect the melten steel quality.
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Article Source：Delelopment of continues casting & tundish
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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