The ingot for φ1 200 mm oversize heavy forged steel back up roll is characterized in huge tonnage,easy segregation,scatter and cavitation.

There were different degree desquamated phenomena on forged steel backup roll of heavy and medium plate mill at the back period of its use and thus bring about much more wastage on the mill roll than before.

Regarding to the 4%Cr cast steel backing roll of 1549 rolling mill in TAI Steel,three heat treatment processes of its roller between casting formation and final finishing have been studied.