A heat transfer model for steel 37Mn5  Φ210 mm round bloom casting is established by software ANSYS to study the effect of casting speed 1. 3 ~ 1. 5 m/min

liquid overheating extent 15° ~ 60° and secondary cooling water rate 0. 58 ~ 0. 78 L/kg during casting bloom heat transfer process on casting bloom surface temperature

bloom solidified shell thickness and solidification end position. Results show that controlling stable lower casting speed

low liquid overheating extent and weaker secondary cooling water rate are available to avoid the formation of crack of steel 37Mn5 Φ210 mm bloom and improve the metallurgy quality of bloom.