The finite element model of solidification heat transfer analysis of 82 Bbloom was established by using finite element analysis software.The temperature field distribution of right-angle bloom and chamfer bloom during solidification process was calculated

and the solidification heat transfer mathematical model was established under the conditions of field technology and equipment.The results show that the angle temperature of the bloom produced by the chamfer mold is 62 ℃ higher than that of the right-angle bloom after exiting the mold

35 ℃higher than that of the right-angle bloom after exiting the secondary cooling zone

43 ℃ higher than that of the right-angle bloom after air cooling.In addition

the higher angle temperature can avoid the third brittle zone（700～900℃）of the steel

thus reducing the occurrence rate of corner cracks of the bloom in the straightening section and being also beneficial to the subsequent rolling process.In production

the desirable chamfer shape of chamfer bloom is chamfer angle of 35°and chamfer surface length of 50 mm.