The casting crack is the main defect occurring in centrifugally cast high speed steel (HSS) rolls, which leads to the rejection of HSS rolls and decreases the production rate of HSS rolls. Based on the analysis of the solidification process and the forming conditions of cracks in the fabrication of centrifugally cast HSS rolls, the low strength of the solidification layer of HSS rolls was found to be the main cause of forming cracks, and another was the clearance between the solidification layer and the mould. Thus the solidification layer of the HSS roll could not endure the large centrifugal pressure. In the common centrifugal casting, the free solidification constriction of HSS rolls was hindered, which accelerated the propagation of the crack. The appearance of interfacial solidification and axial solidification was unfavourable to obtain the compact roll structures, which accelerated HSS roll cracking.
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