Maximum drawing speed of slab caster
The maximum drawing speed of the slab continuous casting machine and the cooling of the mold, the water of the foot roll, the cooling of each stage, and the absence of liquid core at the end of the solidification are the best determinations, but the segregation of the slab can be controlled by adjusting the reduction amount. Formula: Vmax=(K/Dmin)²*LeVmax--maximum pulling speed, m/min; K--solidification coefficient, mm/min1/2; Dmin--minimum safe thickness mm, generally greater than 15mm; Le--crystal Effective length of the device, m
Casting machine flow determination
The number of flows of the casting machine is determined by the amount of molten steel in the ladle, the pouring cycle and the section of the slab. Generally, if the number of flows is large, the amount of molten steel in the ladle should be large, and if the number of flows is small, the amount of molten steel in the ladle should be small. Calculation formula: n=G/tsvp
G--ladle capacity, t;
t--The allowable pouring time of the ladle;
s--the cross-sectional area of each strand of casting billet, m2;
v--pulling speed, m/min;
p--slab density, t/m³, carbon killed steel density 7.6t/m³, boiling steel 6.8t/m³.
Continuous casting slab yield
The yield of continuous casting billet is related to the loss of open-casting swing groove tube, cutting head and tail, abnormal billet throwing, and tundish pouring surplus. , the yield of continuous casting slabs of ordinary steel is over 99.9, and the yield of continuous casting slabs of excellent special materials is over 99.5%.
Liquid core length
Including the general liquid core length and the maximum liquid core length, the general liquid core length is the distance from the mold to the solidification end of the slab: the maximum liquid core length, the distance from the mold meniscus to the flame cutting machine at the maximum pulling speed . The length of the liquid core can be determined according to the quality of the slab and the production rhythm. Calculation formula L liquid=Vmax*D²/4K²Vmax--maximum drawing speed (m/min); D--slab thickness (m); K--solidification coefficient (m/min)
