In the production of Ductile Iron (also known as Ductile Iron), the use of high quality carburizers is critical to achieving the desired properties of the end product. A commonly used recarburizer is graphite petroleum coke (GPC), which is made from petroleum coke through a high-temperature heating process.

When selecting a recarburiser for ductile iron production, several factors must be considered. The most critical of these factors are fixed carbon content, sulfur content, ash content, volatile matter content, nitrogen content and hydrogen content.

Fixed carbon content is the percentage of carbon remaining in the graphite petroleum coke after all volatiles and ash have been burned. The higher the fixed carbon content, the better the recarburiser is at increasing the carbon content in the molten iron. graphite petroleum coke with a fixed carbon content of at least 98% is recommended for the production of ductile iron.

Sulfur is a common impurity in graphite petroleum coke and its presence can adversely affect the final properties of ductile iron. Therefore, it is important to choose a graphite petroleum coke with a low sulfur content (typically less than 1%).

Ash content is the amount of non-combustible material present in the graphite petroleum coke. High ash content creates slag in the furnace, which increases costs and reduces efficiency. This is why it is recommended to use graphite petroleum coke with an ash content below 0.5%.

Volatile matter includes any gases or liquids that are released when the graphite petroleum coke is heated. Higher volatile matter content suggests that the graphite petroleum coke can release more gases, which can create porosity in the final product. Thus, graphite petroleum coke with volatile matter content of less than 1.5% should be used.

Nitrogen content is another impurity in graphite petroleum coke that should be kept lower as it can affect the mechanical properties of the nodular cast iron. graphite petroleum coke with less than 1.5% nitrogen content is ideal for nodular cast iron production.

Finally, hydrogen content is another factor that must be considered when choosing a carbon raiser for nodular cast iron production. Higher hydrogen levels can lead to increased brittleness and reduced ductility. graphite petroleum coke with hydrogen content of less than 0.5% is preferred.

In summary, nodular cast iron production requires a high-quality carbon raiser that meets specific requirements for fixed carbon content, sulfur content, ash content, volatile matter, nitrogen content, and hydrogen content. The use of graphite petroleum coke that meets these requirements will ensure the production of high-quality nodular cast iron, also known as Ductil Iron or SG iron.