The invention relates to a centrifugal
casting high-speed steel composite roll and a manufacture method thereof and belongs to the field of
casting. The composite roll is composed of outer layer high-speed steel, middle layer graphitic steel and core high-strength nodular
cast iron by centrifugal compounding. The centrifugal
casting high-speed steel composite roll is based on the conventional high-carbon high-
vanadium high-speed steel roll, the content of
vanadium is appropriately reduced,
niobium is added at the same time, and the Nb / V is controlled to be 0.3 to 0.5 so that Nb and V form complex
carbide (V, Nb) C so as to avoid forming segregation under the action of
centrifugal force. A roll core of the high-speed steel composite roll adopts high-strength nodular
cast iron, and a multivariate
graphite steel middle layer is poured between an outer layer and the roll core for preventing interfusing elements of Cr, B, and the like which cause
embrittlement when the nodular
cast iron is poured to be fused with the outer layer high-speed steel. Microalloying
processing for refining the organization is carried out on a roll surface high-speed steel material and the middle layer graphitic steel so as to achieve the purpose of improving the thermal
cracking capacity of the roll material. The centrifugal casting high-speed steel composite roll has high overall performance, long service life and good
economic benefits.