With the continuous upgrading of quality standards in the global casting and steelmaking industries, orders for ductile iron castings and precision cast steel parts are steadily increasing, and electric arc furnace (EAF) smelting technology is widely adopted in metallurgical plants both domestically and internationally. This has led to more stringent requirements for the carbon-enhancing raw materials used in these processes, particularly regarding particle size, carbon absorption rate, and impurity control. Among these, 1-5mm particle size graphite petroleum coke carbon enhancers, with their stable physical morphology and metallurgical properties, have become the mainstream carbonaceous raw material for EAF steelmaking and ductile iron production lines.
Particle size is a core indicator determining the effectiveness of carbon enhancers. In EAF smelting scenarios, if the particles are too small, they are easily carried away by the high-temperature flue gas during feeding, resulting in carbon loss and reduced recovery rate. If the particles are too large, the melting speed is slow, the carbon composition is uneven, and the smelting cycle is prolonged. The 1-5mm particle size has been verified through extensive field testing, exhibiting moderate permeability. When added to a high-temperature furnace, it melts at a uniform rate, minimizing dust and burnt-out emissions, and quickly integrates into the molten steel or iron. This also makes it easier to control the carbon content and effectively stabilize the furnace composition. In the ductile iron production process, the inoculation and spheroidization processes are highly sensitive to raw material impurities. Our factory's 1-5mm graphite petroleum coke undergoes high-temperature graphitization, resulting in high fixed carbon content and strictly controlled sulfur and nitrogen levels. This minimizes common defects in castings such as porosity, inclusions, and white spots. Uniform particle screening ensures consistent particle size in each batch, preventing mixing of coarse and fine particles, maintaining process stability throughout the entire cast iron production line, significantly reducing scrap rates, and meeting the production standards of high-end casting export companies overseas.
As an integrated manufacturing and trading company, we are equipped with fully automated crushing and screening equipment that precisely targets the 1-5mm range, rigorously removing fine powder and large impurities. Finished products undergo multiple screenings and magnetic separations to remove iron filings and impurities, ensuring particle cleanliness meets export inspection standards. Products can be shipped in large quantities via FOB Tianjin Port terms, or small-batch samples can be provided for preliminary testing by foundries in Southeast Asia, India, and the Middle East.
Compared to powdered recarburizers and bulk calcined coke, 1-5mm graphite petroleum coke offers superior overall cost-effectiveness, with a consistently high carbon absorption rate exceeding 90%, reducing carbon waste. This particle size is currently readily available year-round, suitable for continuous electric arc furnace production lines and automated ductile iron casting production lines, ensuring stable delivery of long-term orders to overseas customers.
Currently, an increasing number of overseas metallurgical buyers are prioritizing 1-5mm graphite petroleum coke recarburizers. The optimal particle size combined with excellent physicochemical properties balances smelting efficiency and casting quality, making it the preferred recarburizer material for cost reduction and quality improvement in modern electric arc furnace steelmaking and ductile iron production. We continuously optimize our screening process and strictly control batch consistency to provide a stable and reliable supply of graphite petroleum coke to global foundry and steelmaking companies.
