Based on the mechanism of hot cracking formation of castings, the cracking defects of furnace door frame castings was analyzed, and found that the main reasons causing cracking are as follows: construction of the casting was not reasonable, gating system was not proper, and pouring temperature was too high.

The paper provided the certain methods of the innovation and improvement for the door frame,door foot along the door leaf,fan shell body of the water gate,tension bolt of the water door,hub and other parts in the previous design.