Integral submersed nozzle for pouring low-carbon low-silicon cold forging steel

The invention relates to the technical field of steel smelting, in particular to an integral submersed nozzle for pouring low-carbon low-silicon cold forging steel. Molten steel is poured into a copper pipe crystallizer for continuous casting by adopting a conventional integral water gap, and a slag runner is easily generated on the surface of an obtained casting blank. In order to solve the problems, the invention provides the integral submersed nozzle for pouring the low-carbon low-silicon cold heading steel, the slag line area of the integral submersed nozzle is in a three-slag-line arc design, the service life of the integral submersed nozzle is greatly prolonged, the immersion depth of the three slag lines in molten steel in a crystallizer is adjusted in sequence, and the service life of the integral submersed nozzle is prolonged. The continuous casting pouring period is prolonged from conventional 14 h to 24 h or above, the production efficiency of continuous casting of the low-carbon low-silicon cold f