The main application areas of ductile castings are electronic and electrical engineering, light industry, bearing industry, automotive parts industry and other parts processing, because these behaviors have high requirements for ductile castings. And if the quality of ductile casting is not good, it will directly affect the service life of the machine. The machined ductile castings must be rinsed or brushed with metal cleaner or clean industrial gasoline before painting to ensure that the surface oil is completely removed. As with other grime, easily malleable castings are usually polished using water grinding technology. In order to prevent the surface of ductile casting rust, it is necessary to use anti-rust water to polish it.Only in this way can the flatness of the coating film of the ductile casting be improved, and the gloss of the coating film can be improved. The advantages of nodular casting are that the dimensional accuracy of nodular casting is high, uniform, no snap, nodular casting will not produce flash, burr and other phenomena, the production process will not cause pollution, harmless to the environment.

The surface smoothness of spheroidal graphite castings is close to the surface smoothness of precision castings, and the internal structure of spherical graphite castings is quite stable. Annealing affects the performance of ductile castings. Due to the differences in the design shape, wall thickness and cooling rate of spherical graphite castings, casting stress will be generated inside the spherical graphite castings. If the casting stress is not treated in time, it will lead to deformation of spherical graphite castings or cracks during cutting or use. In order to eliminate the casting stress of ductile castings, low temperature annealing process must be used for casting.

The smelting of spheroidal graphite castings is also the main factor affecting the quality of spherical graphite castings, there is practical verification, the smelting process of cupola is, in the rolling process, hot metal drops on the surface of coke, which also leads to an increase in the microscopic carbon content of hot metal. The uniformity is high, the crystal cooling degree is small, the grain is fine, and it is not easy to produce Baikoutun furnace melting. The smelting of hot metal in electric furnace is carried out under the condition of carbon isolation, and the distribution of carbon atoms is uniform and crystalline. The increase in the degree of supercooling increases the tendency of the surface of spheroidal graphite castings to become white, and it is said that the melting of spheroidal graphite castings is better than that of cupola smelting.