gray cast iron inoculants

The mechanical properties of gray cast iron depend to a large extent on its microstructure. The gray cast iron that has not been inoculated is unstable in microstructure, low in mechanical properties, and chilling tendency is likely to appear in the thin wall of the casting. In order to ensure the consistency of the casting quality, the inoculation process by gray cast iron inoculants is indispensable.

With a small amount of addition, gray cast iron inoculants has little effect on the chemical composition of cast iron, and has a great effect on its microstructure. Therefore, gray cast iron inoculants can improve the mechanical properties of gray cast iron and have a significant effect on its physical properties. . Good inoculation treatment also has the following effects: eliminating or reducing the tendency of white mouth; avoiding excessively cold tissue; reducing the wall thickness sensitivity of cast iron parts, reduce the difference of micro-structure between thin and thick sections of castings small, and the hardness difference is also small; Conducive to eutectic nucleation, so that the number of eutectic groups increased;
Gray cast iron inoculants can make the shape of the graphite in the cast iron to be mainly fine and evenly distributed type A graphite, thereby improving the mechanical properties of the cast iron.
Cast iron which treated by gray cast iron inoculants has good fluidity, reduced shrinkage of castings, improved processing performance and reduced residual stress.

There are several different types gray cast iron inoculants. Each with its own properties. After many years of research and examination of market, there’s still no standard for gray cast iron inoculants. The users, based on their products, should carefully check the difference between gray cast iron inoculants as well as different cost as well, and make some experience if necessary. Then made their decision.