The invention discloses a
sizing nozzle casting method utilized by a
tundish of a small square billet
continuous casting machine in a
steelmaking enterprise. The method is characterized in that (1), the temperature of
sizing starting-up
molten steel is 1605 DEG C to 1630 DEG C, the temperature under a normal
casting state is 1575 DEG C to 1595 DEG C, and the temperature of the
tundish is larger than 1570 DEG C when
casting is started and is less than or equal to 1550 DEG C under a normal casting state; (2),
sizing casting and pulling speed is controlled, the starting pulling speed is 1.2 m / min, and the temperature pulling speed is 1.2 to 3 m / min; (3), the liquid level of the
tundish is controlled, and the depth of the
molten steel in the tundish is controlled at 450 to 750 mm; and (4), key points of the sizing are characterized in that a, continuous baking is carried out on the tundish for more than 60 minutes according to the order of soft fire, middle fire and large fire, b, dummy
ingot feeding and plugging and cooling strip placing are carried out, and c, starting operation is carried out, the emergence time is longer than 13 seconds, and the method of pulling speed
automatic control is adopted. According to the method, casting of
molten steel flow injected into a crystallizer is controlled through the inner
diameter of the sizing
nozzle, a stopper rod and a stopper rod control mechanism are not needed, the control of the flow of the sizing
nozzle is relatively stable, the improvement of the quality of the
continuous casting blank is facilitated, automatic casting is realized, and the labor intensity of workers is reduced.