The numerical simulation of flow field and temperature field in casting mold for wide slab at Ma' anshan Steel has been carried out by established a three-dimensional model using Fluent software
and the effect of immersion depth of nozzle (150 ~ 190 mm)
angle of side hole of nozzle (- 10° ~ - 16°)
ratio of cross-section area of side-hole to inside-hole (2. 2 ~ 3. 2) on liquid flow in 230 mm x 1 800 mm mold with casting rate 0. 9 m/s is analyzed by orthogonal experiment method. Study results show that the influence of immersion depth of nozzle and side angle on mold liquid surface wave F number and thickness of solidified shell is significant. The optimum technology parameters of submerged nozzle for casting 230 mm x 1 800 mm slab are submerged depth of nozzle 170 mm
angle of nozzle side-hole 13° and ratio of crosssectional area of side-hoie to inside-hole 2. 7.