The numerical simulation and calculation on eight-strand 40 t tundish lining and liquid steel during roasting and casting have been carried out

and the 20CrMnTiH steel 200 mm x 200 mm billet casting process has been tested in situ. The results show that tundish lining is heat up slowly during roasting and warmed rapidly with steel tapping into tundish. Temperature of the out surface of tundish for the third heat reaches to 397 °C and get to heat balance. At end of the 2nd heat

steel temperature at the side and center part of tundish is respectively 5.2、1.5 °C higher than the first heat

and modeling result also shows that steel temperature at center nozzle is 4.8 ℃ higher than that at side nozzle. Actual measuring data for second heat show that steel temperature at center part is 4 ℃ higher than at side position. Modeling results match with the measuring data and it shows that steel temperature distribution get to stable and uniform in tundish at the end of the 2nd heat. When the roasted temperature of tundish lining increases from 900 ℃ to 1 000 ℃

the steel temperature of the first heat reduces slowly and the steel temperature at outlet of nozzle increases a little and the temperature difference between the streams dereases.