The multi-component white cast iron has been widely used as a rolling-mill roll material for hot rolling owing to its excellent wear resistance. However, when applied to roughing trains for bar and wire rod rolling at low speed under high thermal and mechanical loads, damage was impaired due to crack propagation. To address this problem, the control of microstructures such as finer microstructures and dispersion of the granular type MC carbide were carried out by designing the alloy composition, adding a small amount of Ti and rapid solidification. As a result, the improvement of fracture toughness and the suppression of crack propagation were achieved, and both abrasion resistance and high-temperature oxidation resistance were provided. This material was adopted as the shell material for a composite roll manufactured by the continuous pouring process for cladding (CPC) method to actual rolling operation, and the durability was found to be improved to more than three times that of conventional rolls.
