Abstract: Taking the tubesheet parts of steam generators for Hualong, units as an example, studies are made on the manufacturing difficulties and quality supervision control points of super-thick cakeparts with the combination of the harsh operating environment requirements. By evaluating the solidification process in the early stage of manufacturing, controlling the quality of raw materials in the early stage of product manufacturing, and tracking the key processes in the manufacturing stage, safe and reliable parts are guaranteed consistent with the established manufacturing processes as well as design and nuclear safety requirements.