High Cr duplex rolls use the high alloy cast steel (or iron) with up to 6~22% Cr content as the shell’s material, and use high strength nodular iron as the core material. According to the content of carbon, it can be divided into high Cr cast steel rolls and high Cr cast iron rolls. Influenced by the high Cr content, its carbide is M7C3 which has higher hardness, better toughness and extremely good wear resistance than normal carbide. With the high alloy elements and special heat treatment, the matrix has the excellent comprehensive properties at high temperature.

According to the stand used and cooling water in the hot strip mills, high Cr cast steel or high cast iron can be selected. These rolls can be used as the working rolls in the cold mills and tempering mills, and the rings can also be made of these material.