Method for replacing split submersed nozzle from medium-high carbon steel produced by soft reduction process

The invention discloses a method for replacing a split submersed nozzle with medium-high carbon steel, and relates to a method for replacing a split submersed nozzle with medium-high carbon steel produced by adopting a soft reduction process. When a casting powder layer in the crystallizer is consumed and casting powder enters a sintering layer, the replaced split submersed nozzle is taken out from the crystallizer, the target range for controlling the liquid level is automatically controlled through the stopper, the time for replacing the split submersed nozzle is controlled, and the casting powder layer is replaced. Before casting powder enters a melting layer from a sintering layer, the baked split submersed nozzle is arranged, normal lubrication and heat transfer of the casting powder in a crystallizer are guaranteed, the constant pulling speed is kept before and after replacement, the stable liquid core length of a continuous casting blank is effectively guaranteed, and the continuous casting blank can b