The performance of zirconia sizing nozzle brick

Source: | Author:ChangXing Refractory | Published time: 1483 days ago | 1213 Views | Share:

Nowadays, most steel billets in the world are produced by continuous casting technology, so the service life and performance of the sizing nozzle refractories are very critical. Zirconia sizing nozzle is widely used in billet continuous casting tundish. The performance of the nozzle directly affects the length of continuous casting time. The sizing nozzlee is the nozzle brick in the sliding nozzle device adopted by the steel mill when casting the billet. It took nearly 80 years for the sliding nozzle device from the conception to the industrialization. The most important reason is that the material is not good enough. It has a significant comparative advantage with the stopper system. Zirconia nozzles are highly corrosive to molten steel and molten slag. The nozzles are usually made of higher purity zircon, CaO stabilized ZrO2 and industrial zirconia.

The most critical part of the sliding nozzle device is the skateboard brick and the nozzle brick embedded in it. In the device, there are usually upper and lower skateboard bricks and upper and lower nozzle bricks. When the upper nozzle and lower nozzle bricks overlap, the casting starts, and the upper nozzle brick is installed at the bottom of the ladle. The upper slide brick does not move, the lower nozzle brick and the lower slide brick slide to realize the control of pouring steel. The upper nozzle brick is soaked in molten steel for a long time, and it is relatively unsuitable to be replaced. It has high requirements on the product and has a long life expectancy. The key to the spout is to control the speed and quality of steel pouring, and the life expectancy is low. The life of the spout brick can reach eight hours or more.

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