Integral submerged nozzle: this nozzle does not need tundish nozzle, and its shape is long, generally more than 700mm. There are two forms. One is the built-in nozzle, which is installed from the inside to the outside of the tundish. The nozzle is an integral structure with good sealing; The other is the external nozzle, which is installed from the bottom of the tundish to the inside. At present, it has not been used in China.
Combined submerged entry nozzle: its form is composed of tundish nozzle and submerged nozzle. This nozzle is short, generally less than 400mm. In use, the upper end of the submerged nozzle is connected with the lower end of the tundish nozzle, and its lower end is inserted into the mold.
Sliding nozzle type submerged nozzle: This submerged nozzle is equivalent to the lower nozzle of sliding nozzle. The submerged nozzle is connected with the lower nozzle of the sliding nozzle or the lower sliding plate.