High Ni-Cr duplex indefinite chilled iron rolls exhibit excellent properties which are produced by centrifugal or overflow casting process. The high micro-hardness of matrix and carbide can be obtained through adjusting the content of Ni, Cr, Mo and other alloy elements. A fine and uniform shell layer with a low hardness fall off can be obtained with special heat treatment technique. As with a little of graphite, these rolls are much more resistant to wearing, firecracking, spalling and pinching.

The shell depth may be varied to the particular application, and the core adopts either grey iron with ductile or nodular iron with high strength, which can give core and neck a satisfactory toughness.

The sufficient cooling water is essential on the working rolls.