Submersed nozzle

The invention provides a submersed nozzle, which is used for a continuous cast steel slab crystallizer, and is characterized in that a main water hole is formed in a nozzle body, and an upper port and a shunting bottom are formed in the nozzle body; the internal thread structural section is formed on the inner side wall of the nozzle body below the upper port; the refractory adsorption material section is formed on the inner side wall of the nozzle body below the internal thread structure section and is adjacent to the internal thread structure section; the slag line is formed on the outer side wall of the nozzle body below the internal thread structure section; and the nozzle side hole is formed in the nozzle body between the refractory adsorption material section and the shunting bottom. Through structural improvement, molten steel can be mixed more uniformly, molten steel stream kinetic energy at the outlets of the side holes is reduced, the impact depth of the molten steel in the crystallizer becomes shal