Large forgings refer to products that are formed into the desired shape or appropriate compression force by plastic deformation of metal under pressure. This force is usually achieved by using a hammer or pressure. The casting process can form a fine grain structure and improve the physical properties of the metal. Large forgings refer to forgings with large tonnage and size, including rings, shafts and discs.

The manufacturing of large forgings is one of the key technologies for the manufacturing of major equipment, and its quality directly affects the overall level and operational reliability of major equipment. Large forgings are the foundation for the development of industries such as power, shipbuilding, metallurgy, petrochemicals, heavy machinery, and national defense, and are a prerequisite for the development of advanced equipment manufacturing. Therefore, the quality control of large forgings is crucial. Only by ensuring the quality of forgings can better large forgings be manufactured, the overall level and safety reliability of major equipment in my country can be improved, and the development of my country's industry can be promoted.