According to prototype 25 t tundish

the liquid flow field and the removal of inclusions in an approximate rf-shape tundish with three kind卜 of weirs in 4-strarid easting have been analyzed by using experimental similarity ratio λ= 1 ： 2. 3 uatrr model. Results showed that by using original weir

there was a great differrm-r in (low characteristics between I wo outlets at the same hide of tundish

ami compared t。inside outlet the outside outlet had longer minimum residence lime and peak time and large dead zone volume led to liquid temperature variation and delaying inclusion floatation; by using U- type weir

the peak time could be prolonged

but with short minimum residence time and large dead zone volume； and bv lining -shape weir it was available to efficiently change the liquid flow distribution in tundish and improve inclusion removal. The conimercial test for steel 30CrMo indicated that with using Y-weir the large inclusion amount in steel decrrasrtl by 16. 9% as co in pared with using original wrir.