Silicon Carbide Casting

In ordinary cast iron casting, silicon carbide is used as an inoculant, and its content is generally controlled at 0.5%-2%. For example, in some small grey cast iron parts production, the content of silicon carbide is about 0.8%. This content can effectively improve the graphite morphology and enhance the mechanical properties of castings.

In the casting of ductile iron castings, the content of silicon carbide as spheroidisation promoter and inoculant is usually 1%-3%. In the casting process of large ductile iron pipe, the content of silicon carbide is kept at 1.5%-2.5%. This content helps to improve the spheroidisation rate and enhance the toughness and strength of the castings.

In the cast steel casting field, silicon carbide as a deoxidiser and carbon enhancer, the content of the standard fluctuation range, from 0.5% -5%. In some low alloy steel castings, the silicon carbide content is about 1-2%. In high carbon alloy steel castings, the silicon carbide content may reach 3%-5% to meet specific chemical composition and performance requirements.

When silicon carbide is used in foundry refractories, the content varies depending on the type of refractory and the area of use. For example, in silicon carbide insulating refractories, the silicon carbide content can be as high as 70%-90% to ensure that the refractory has good high-temperature performance, erosion resistance and thermal insulation properties.