The High- Cr iron rolls are mainly used as work rolls in the roughting&previous -finishing stands of hot strip continuous rolling mills; work rolls in the roughing& finishing stands of the plate mills; work rolls in temper mills and cold strip mills
The High -Cr cast iron rolls are made by centrifugal casting process, the work layer contains 12-22% Chromium. Through rational chemcial composition allocations and different heat treatments, the matrix can be controlled as sorbite carbides, Mo2C carbides ect. According to different purposes of use, the material of the core could be nodular iron or grey iron.
We make this type of roll by centrifugal cast double poured. In the case, we can achieve an excellent wear resistance in the shell with flake graphite, bainite& martensite and primary carbide type M7C3 + secondary carbide in the microstructure. Besides the excellent resistence, it is also good against fire cracking thanks to the oxide film Cr2O3 formed on the body surface while rolling. At the same time , the core is strong enough to assure the roll can work saftey.