Study of centrifugal casting technology for HSS compound roll collars

The high speed steel (HSS) is of high hardness and good red hardneess, suitable for the manufacture of roll collars. The advantages of common centrifugal casting for HSS roll collars include simple process and convenient operation, but the inner side of collar is hard and difficult to work, while the alloy consumption and production cost are high. The centrifugal casting process for HSS/nodular iron compound roll collar was studied. The pouring temperature and interval in pouring are the main factors affecting compound quality. The HSS requires high quenching temperature, causing property deterioration of inner nodular iron layer. Thus, by HSS composition modification the HSS collars are produced with a high hardness of HRC 64 after tempering in casting state.