A coupled thermal-mechanical model including dynamic heat exchange between mold and bloom solidified shell is established by using Marc software

and the effect of radius of mold comer on thermo-mechanical behavior of bloom local shell and mold including temperature

stress and strain distribution has been analyzed. Results show that for bloom with cross section 280 mm x 380 mm the available radius of mold comer is 17. 5 ~ 20 mm

as the radius of mold corner is lower than that value the temperature gradient in local zone with 10 ~ 20 mm distance from bloom corner is larger that is unfavorable to homogeneously develop bloom shell； as the radius of mold corner is larger than that value

the greater contact normal force between mold and bloom shell leads to starlike cracks on strand.