The hard-alloy grinding-disc is core comminution component for modified-starch ultrafine mills. It consists of rotating disc and stationary disc. Substrate: 316L stainless-steel, with hard-alloy wear-resistant hard-facing applied over working surfaces. High-speed-rotating moving-disc subjects starch material to impact, shearing and friction between inter-tooth gaps for ultrafine pulverization. It features high dynamic-balance precision, good wear and impact resistance and minimal risk of metallic contamination. Adjustable disc-to-disc clearance controls powder fineness. Easy disassembly-and-maintenance. Suitable for continuous dry ultrafine grinding of food-grade modified-starch.