In order to obtain a more reasonable 50 t tundish flow control device

a single flow tundish water model with a geometrical similarity ratio of 1:4 is established

and physical simulation tests are carried out to study the effects of different flow rates ( 1.09 and 1.24 m

3

/h )

long nozzle insertion depth(25

50 and 75 mm )

retaining dam height ( 90 and 135 mm )and the distance between long nozzle and weir(190 and 390 mm )on the flow field in tundish. The simulation results show that when the response time is smaller

the dead zone volume of the tundish is larger. The larger the average residence time

the smaller the dead zone volume in tundish. The optimal tundish process parameters of model are： flow control scheme 8

#

flow rate 1. 24 m

3

/h

long nozz

le insertion depth 25 mm

the average residence time is 294. 99 s

the percentage of dead zone volume is 16. 05%. SPHD steel 50 t tundish production application shows that by using flow 40 m

3

/h

long nozzle inserted depth 100 mm

dam height 540 mm

the inclusion amount in steel is 2. 51 mg/10 kg

removing inclusion obviously.