What is the difference between graphite carbonizers and semi-graphite carbonizers?

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There are many types of carbonizing agents. Based on the raw materials and the composition of their various components, they can be roughly divided into four categories: petroleum coke carbonizing agents, graphite carbonizing agents, coal-based carbonizing agents, and petrocoke carbonizing agents. The raw materials used for these different types of carbonizing agents vary, which means that the values related to fixed carbon, sulfur, ash, and volatile matter in the resulting carbonizing agents also differ. Additionally, the ultimate absorption rates achieved after their use vary as well. Therefore, it is essential to pay close attention to various factors when choosing to purchase carbonizing agents. In particular, the role of carbonizers in gray cast iron and ductile iron is also different, and they have a significant impact on the production of castings. Therefore, when choosing a carbonizer, it is essential to understand its specific composition and uses! Let’s first take a look at the composition of graphitized petroleum coke as a carbonizing agent. For graphitized carbonizing agents, the requirements are: carbon content ≥98.5%, sulfur content ≤0.05%, ash content <0.5%, volatility <0.5%, and nitrogen content <300 ppm. As for semi-graphitized carbonizing agents, the requirements regarding sulfur and nitrogen content are as follows: