Method for continuously casting multi-strand 16m small square billet multi-segmentation straight rolling bar

The invention provides a method for continuously casting a multi-strand 16m small square billet multi-segmentation directly-rolled bar, which adopts a continuous casting machine to reduce the heat loss of a steel billet at a high pulling speed, the head temperature of a cut casting billet is 1050-1070 DEG C, the tail temperature of the cut casting billet is 1070-1100 DEG C, the whole course of heat preservation from steel billet cutting to steel rolling is performed, and steel is conveyed by a high-speed roller way, so that the pulling speed of the continuous casting machine is improved, and the production efficiency is improved by optimizing water distribution. The sensible heat loss of the steel billet is reduced, the heat energy of the core part of the casting billet is supplemented to the surface after the steel billet is taken out of a withdrawal and straightening machine, the temperature after cutting is ensured, the temperature drop of the steel billet can be reduced by about 30 DEG C through a heat pr