Hebei Fengchao Import and Export Co., Ltd. is one of the most reliable manufacturers and suppliers of artificial graphite carburizer 3-5mm in China. With a professional production team, we are able to meet the needs of the majority of our customers. If you're going to wholesale bulk artificial graphite carburizer 3-5mm made in China, welcome to get pricelist from our factory.
The 3-5mm synthetic graphite carburizer is premium graphite granular material manufactured via ultra-high-temperature graphitization, crushing and precise screening. Its robust particle size delivers strong resistance against entrainment loss by flue gas during bulk furnace charging. Featuring high fixed carbon, low sulfur and low nitrogen, the particles sink rapidly into the molten bath by self-weight. Suitable for feeding into medium-frequency furnaces and electric arc furnaces together with scrap steel, it achieves progressive carbon pickup. It helps metallurgical users stabilize melt assay composition and mitigate sharp composition fluctuations in batch melting campaigns.
The 3-5mm synthetic graphite carburizer is produced by subjecting carbon raw materials to ultra-high-temperature graphitization, followed by crushing and rigorous classification screening to lock particle size within the 3-5mm range. Compared with fine graphite grades, the solid particles are less likely to be swept away by hot furnace gas flow during bulk charging. After being charged into the furnace with scrap steel, particles sink deep into the molten bath by gravity and release carbon gradually rather than dissolving instantly. With high fixed carbon and low sulfur & nitrogen, it minimizes interference from harmful impurities. Widely applied in primary carbon addition for medium-frequency furnaces and electric arc furnaces, it fits the production of high-quality castings and alloy steel. It enables metallurgical foundries to obtain stable carbon absorption rates and reduce risks of drastic carbon fluctuations in consecutive smelting heats.
Carbon base material undergoes ultra-high-temperature graphitization heat treatment, followed by crushing, multi-stage screening and impurity removal to produce dense 3-5mm graphite particles. Fines and oversized agglomerates are strictly sifted out to guarantee regular particle shape and reduce powder loss after furnace charging. The production technical team prioritizes controlling the graphitization holding cycle and cooling procedure to stabilize key metallurgical indicators including fixed carbon, sulfur and nitrogen. A dedicated particle sorting and storage zone is established, isolated from anthracite and petroleum coke materials to prevent cross-contamination. It is mainly supplied for electric arc furnace and high-power medium-frequency furnace smelting applications. In addition to routine physical and chemical tests, enhanced inspection for particle crush resistance and sieve analysis is implemented. Samples are retained and archived for each batch. Third-party on-site sampling and laboratory analysis are acceptable for export orders. External ash impurities are strictly controlled. The particles sink readily by gravity to deliver progressive carbon pickup, ideal for bottom laying together with scrap steel, ensuring stable carbon yield across consecutive smelting heats.
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FAQ
Q: What are the differences in charging methods between 3-5mm synthetic graphite carburizer and the 0-1mm grade for medium-frequency furnace smelting?
A: The 3-5mm particles have greater self-weight and are preferably laid at the furnace bottom and covered with scrap steel for weighting down. They are suitable for one-time feeding with furnace burdens at the early melting stage. The 0-1mm grade can be added at the early stage, and small dosages may also be used for ladle carbon supplementation. The 3-5mm size is too large for late ladle carbon fine-tuning; supplementary addition at this stage leads to slow dissolution, and graphite particles may float on the surface of molten iron, resulting in distorted composition analysis.
Q: Why does a small amount of fines still form for 3-5mm particles during loading, unloading and transportation? What measures can be taken to minimize breakage during transit?
A: Although graphite particles are dense overall, graphite features a layered crystal structure. Edges and corners may spall under repeated impact and compression, generating secondary fines. An extra screening process is added before shipment to remove crushed powder. For logistics, enclosed trucks are recommended to reduce repeated transshipment. After arrival, avoid repeated stockpile turning with forklifts to lower mechanical compression and powder generation.
Q: How does progressive carbon pickup of 3-5mm particles affect the electric arc furnace smelting rhythm?
A: Carbon is released gradually as scrap steel melts, producing a gentle carbon rise curve with low risk of instantaneous carbon overshoot. However, the carbon pickup cycle is relatively long. The smelting process must match the melting cycle; feeding after full melt-out is not advisable. If added once melting is completed, stirring time should be extended appropriately to allow particle dissolution, otherwise unstable carbon assay readings may occur.
Q: Is it necessary to control stockpile height when warehousing 3-5mm synthetic graphite particles?
A: Yes, stockpile height must be limited and excessive stacking avoided. Materials in the lower layer bear heavy pressure from upper layers, and graphite particles tend to fracture under compression, generating substantial secondary fines. Indoor dry and ventilated warehouse storage is preferred. Waterproof tarpaulins must be applied for temporary open-air stacking. If moisture is absorbed, rapid vapor expansion upon exposure to high furnace temperature after charging can trigger molten steel splashing accidents.
Q: What advantages does 3-5mm synthetic graphite carburizer have over calcined petroleum coke carburizer for alloy steel smelting?
A: Complete high-temperature graphitization yields lower sulfur and nitrogen content, reducing risks of nitrogen-induced cracks and sulfide inclusions. It also offers better wettability with molten metal and more consistent carbon absorption. Nevertheless, the product carries a higher procurement cost. Petroleum coke can be selected for ordinary carbon steel production for cost considerations. For alloy steel with stringent quality requirements, this graphite particle grade is preferred as the primary carbon additive charged at the furnace bottom.
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