Method for controlling drawing speed of billet

The invention discloses a method for controlling the drawing speed of a billet. The method for controlling the drawing speed of the billet comprises the following specific steps and parameters: A, thesuperheat degree of molten steel of a tundish is controlled to be 25+/-5 DEG C; B, the thickness of a liquid slag layer of casting powder of a crystallizer is controlled to be 10-20 mm, the hemispherical point temperature is less than 1100 DEG C, and the viscosity at 1300 DEG C is less than 0.3 Pa.s; C, the width of a water gap of the crystallizer is 3.5 mm, the flow velocity and the water pressure of cooling water at the water gap are respectively larger than 12 m/min and larger than 1.2 MPa, the taper form of the crystallizer is a continuous parabola, and the total taper is less than or equal to 1.25%; and D, a crystallizer vibration device adopts non-sinusoidal vibration, the vibration amplitude is 0-12 mm, and the frequency of vibration is 30-350 times every minute; E, high pressure (>=1.0 Mpa) water cooling