Scouring-resistant and wear-resistant tundish upper nozzle with ultra-long service life

The tundish upper nozzle comprises a tundish upper nozzle body and an iron shell, the tundish upper nozzle body is divided into a sliding plate face body, a sliding plate face zirconium face, an upper body, an upper body zirconium oxide core and a molten steel channel, and the upper body zirconium oxide core is located in an inner cavity of the tundish upper nozzle body. The upper body zirconium oxide core is arranged on the upper body zirconium oxide core, the bottom of the upper body zirconium oxide core is clamped in an inner cavity of the sliding plate zirconium surface, the sliding plate zirconium surface is of a circular structure, and the planeness after the sliding plate zirconium surface, the upper body zirconium oxide core and the sliding plate surface body are assembled ranges from 0.05 to 0.2. And on the other hand, the manufacturing cost is saved, the production cost is reduced, the production requirement of continuous casting in steelmaking is met, the node problem which puzzles long-time contin