Based on the measured value of ingot surface temperature in ingot stripping at situ

with using ProCAST software the calculation model for filling and solidifying process of 3 t ingot (body height 1675 mm

hot top inclined angle 65. 3°

height of liquid surface in hot top 290 mm) of steel SCM822H (/% ： 0.20C

0.80Mn

0.25Si

0.013P

0.006S

1.14Cr

0.39Mo

0.01V

0.036Al

0.0002B) has been established. With calculation by the model the relation between hot top inclined angle

ingot body height-width ratio and body cut-off volume ratio caused by shrinkage cavity is gotten to get the optimized ingot parameters i. e. body height-width ratio 1846/630 and hot top inclined angle 90°. According to optimized ingot mould parameters the simulation results show that with using the new ingot mould the ingot body cut-off volume ratio decreases from original 13. 5% to 0

it is available to ensure all the shrinkage cavity is in the hot top.