Stainless steel precision casting or investment casting, silica sol process. It is a kind of casting technology with less cutting or no cutting, and it is an excellent process technology in casting industry. It is widely used in casting of various types and alloys, and the dimensional accuracy and surface quality of the castings produced are higher than those of other casting methods, and even the castings which are difficult to be cast by other casting methods, which are difficult to cast at high temperature and are not easy to be machined, can be cast by investment precision casting.