Overview
Graphite granule carburizer is a premium carbon additive derived from high-purity graphite. It is widely used in metallurgical industries to increase carbon content in molten metals, particularly in electric arc furnace (EAF) steelmaking and cupola furnace cast iron production. The material's crystalline structure ensures superior carbon dissolution compared to petroleum-based alternatives, resulting in more efficient alloy adjustments and reduced slag formation. Its consistent composition makes it a reliable choice for producing high-grade steel with precise carbon specifications.
Physical and Chemical Properties
Graphite carburizer exhibits exceptional thermal stability with a sublimation point above 3600°C, making it suitable for high-temperature metallurgical processes. The material's layered structure facilitates rapid carbon diffusion into molten metal, typically achieving absorption rates exceeding 90%. Key quality indicators include fixed carbon content (usually 95-99%), sulfur levels below 0.05%, and minimal trace elements. The granular form (typically 1-10mm) ensures easy handling and controlled dissolution rates, while the low density prevents floating on molten metal surfaces.
Main Applications
In steel production, graphite carburizer serves as a cost-effective alternative to metallurgical coke, particularly for producing ultra-low sulfur steel grades. It's essential for manufacturing high-carbon steels (0.6-1.5% C) used in automotive components and tooling. The foundry industry relies on it for producing nodular cast iron, where consistent carbon addition prevents chill formation. Specialty applications include ferroalloy production and as a recarburizer in ductile iron manufacturing, where its low nitrogen content prevents gas defects.
Safety and Storage
While graphite is generally non-reactive, the fine particulate form requires dust control measures. Storage areas should be equipped with proper ventilation to prevent airborne particle accumulation, which may pose inhalation risks. Moisture protection is critical - dampness can reduce material flowability and affect dosing accuracy. Bulk storage should utilize sealed containers or silos with desiccant packs. For fire safety, maintain separation from strong oxidizers despite graphite's high ignition temperature.
B2B Procurement Guide
Industrial buyers should prioritize suppliers who provide batch-specific chemical analysis certificates, particularly for sulfur, nitrogen, and ash content. The optimal particle size depends on furnace type - finer granules (1-3mm) suit induction furnaces, while larger sizes (5-10mm) work better in EAFs. Consider purchasing terms that include moisture testing upon delivery. Many manufacturers offer technical support for dosage calculations based on furnace parameters and desired carbon increments. Containerized shipments (25kg bags or 1-ton big bags) are common for international trade.
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