The heavy use of alloying elements in the rolls is after World War II. This is the development of steel rolling equipment towards large-scale, continuous, high-speed, automated development, and the increase in the strength of the rolling materials and the increased resistance to deformation. the result of. During this period, semi-steel rolls and nodular cast iron rolls appeared. After the 1960s, powder tungsten carbide rolls were successfully developed. The centrifugal casting technology of rolls widely promoted in Japan and Europe in the early 1970s, and differential temperature heat treatment technology have significantly improved the comprehensive performance of strip rolls. Composite high chromium cast iron rolls have also been successfully used on hot strip mills. At the same time, forged white iron and semi-steel rolls were applied in Japan. In the 1980s, Europe introduced high-chromium steel rolls and cold-rolled rolls with ultra-deep hardened layers, as well as special alloy cast iron rolls for the finishing of small sections and wire rods. The development of contemporary steel rolling technology has led to the development of higher performance rolls. The cores produced by centrifugal casting and new composite methods such as continuous casting composite method (CPC method), spray deposition method (Osprey method), electroslag welding method and hot isostatic pressing method are forged steel or ductile steel with good toughness. Cast iron and composite rolls of high-speed steel series and cermet rolls have been applied to new-generation profile, wire and strip mills in Europe and Japan, respectively.