Silicon carbon alloy is a metallurgical additive that is commonly used in casting iron. It is a combination of silicon and carbon, typically containing 50-60% silicon and 10-15% carbon, with the remainder made up of iron and other trace elements.

The primary purpose of adding silicon carbon alloy to casting iron is to improve the iron's mechanical properties, such as its strength and hardness. Silicon increases the iron's strength and wear resistance, while carbon enhances its hardness and tensile strength. Additionally, silicon carbon alloy can also improve the iron's casting properties by reducing shrinkage and improving fluidity.

The process of adding silicon carbon alloy to casting iron involves melting the alloy together with the iron in a furnace. The mixture is then poured into a mold and allowed to cool and solidify, forming the final product.

the typical composition of silicon carbon alloy used in casting iron is as follows:

• Silicon (Si): 50-60%
• Carbon (C): 10-15%
• Iron (Fe): 20-30%
• Other trace elements: 1-5%

The exact composition may vary depending on the specific application and the desired properties of the alloy.